Liebert nx 30 kva ups manual

Cold air enters through ventilation grilles at the front of the cabinet for NXa kVA and through ventilation grilles located at the front and bottom of the cabinet for NXa kVA. Hot air is released through grilles at the top. Do not cover the ventilation openings. If necessary to avoid room temperature build-up, install a system of room extractor fans.

Optional air filters are available if the UPS is to operate in a dusty environment. The UPS heat dissipation detailed in Table 34 can be used as a guide for air conditioning sizing, depending on the selected mode of operation:. The UPS is suitable for mounting on concrete or other non-combustible surface only. Batteries should be mounted in an environment where the temperature is consistent and even over the whole battery. Temperature is a major factor in determining the battery life and capacity.

Operating above this range will reduce the battery life while operation below this range will reduce the battery capacity. Keep batteries away from main heat sources or main air inlets etc. Where the batteries are located externally to the main UPS cabinet, a battery protection device. Should the equipment not be installed immediately, it must be stored in a room for protection against excessive humidity and or heat sources see Table An unused battery must be recharged periodically per battery manufacturer recommendation.

Temporarily connecting the UPS to a suitable AC supply mains and activating it for the time required for recharging the batteries can achieve this. The cabinet is mounted on four casters for ease of positioning and for moving short distances. Jacking feet are provided to prevent the UPS from moving once it has been wheeled to its final position.

The batteries are at maximum efficiency in this temperature range see Table The UPS cabinet is constructed around a steel chassis with removable panels. The top and side panels are secured to the chassis by screws. Access to the power terminals, auxiliary terminals blocks and power switches is from the front. Operational status and alarm information is provided through the front door operator control panel. Models 40kVA and below house both the power components and an internal battery.

A UPS may comprise a number of cabinets, depending on design requirements e. In general, all the Liebert cabinets used in a particular installation are of the same height and designed to be positioned side-by-side to form a matching array. Refer to 5. The UPS consist of a single cabinet, which uses typically forty 40 12V battery blocks, fitted internally and connected in series to provide a nominal battery voltage.

The UPS may be shipped without the batteries fitted. An extended battery option is available. This comprises a separate cabinet containing additional batteries that can be connected to the UPS to increase its battery run time. Battery cabinets and batteries are usually shipped separately. The 60 to kVA consist of a single cabinet without any internal battery. Usually, with 60 to kVA UPS installations, the batteries are contained in a purpose-built battery cabinet, which sits alongside the main UPS equipment.

Batteries are accessible in the external cabinet from the front, making it unnecessary to allow for side access. Ensure that any equipment used to move the UPS cabinet has sufficient lifting capacity. The UPS is fitted with casters.

Take care to prevent the NX from moving when unbolting the unit from its shipping pallet. Ensure that adequate personnel and lifting aids are available when removing the shipping pallet. Ensure that the UPS weight is within the designated surface weight loading of any handling equipment.

See Table UPS and optional cabinets battery cabinets, top cable entry cabinets, etc. Care must be taken when maneuvering units fitted with batteries. Keep such moves to a minimum. To enable routine tightening of power terminations within the UPS, in addition to meeting any local regulations, Liebert recommends providing adequate clearance in the front of the equipment for unimpeded passage of personnel with the doors fully opened. It is important to leave mm The component layout of the UPS supports front and top access while servicing, diagnosing and repairing the UPS, thus reducing the space requirement for side and rear access.

The UPS cabinets are fitted with casters on the base to allow ease of movement and positioning. Casters are strong enough for movement across even surfaces only. Caster failure could occur if they are subjected to shock loading. When the equipment has been finally positioned, ensure the adjustable feet are set so that the UPS will remain stationary and stable. Diagrams in 5. If the equipment is to be installed on a raised floor it should be mounted on a pedestal suitably designed to accept the equipment point loading.

Cable entry is made possible by removing a blanking piece fitted at the bottom of equipment to reveal the cable entry hole. Optionally a top cable entry extension may be used. The top cable entry option is fitted on the side of the UPS cabinet and is supplied without side panels; the side cover from the UPS being used.

This facilitates cable entry through the top metal panel after the appropriate cable entry holes have been cut. The top cable entry also includes the power connection cables between the cabinet and the UPS.

Circuit breakers or other protective devices must be installed in the AC supply, external to the UPS. This chapter provides guidelines for qualified installers who must have knowledge of local wiring practices pertaining to the equipment to be installed.

Overcurrent protection must be installed at the distribution panel of the incoming main supply. The protection must discriminate with the power cables current capacity and with the overload capacity of the system see Table Split-Bypass —If a split-bypass is used, install separate protective devices for the rectifier and for the bypass in the incoming mains distribution panel.

Rectifier and bypass input sources must be referenced to the same neutral potential. For IT power systems, four-pole protective devices must be used, external to the UPS, both upstream of the input distribution panel and downstream toward the load. To avoid false alarms, earth leakage monitoring devices when used in systems with split-bypass input or when used in paralleled UPS configurations, must be located upstream of the common neutral sinking point.

Alternatively, the device must monitor the combined four-wire rectifier and splitbypass input currents. Liebert recommends verifying the selectivity with all other differential devices both upstream of the input distribution board and downstream toward the load. The UPS and its associated batteries are protected against overcurrents through a DC compatible disconnect device.

Any external distribution board used for load distribution shall be fitted with protective devices that discriminate with those used at the bypass input to the UPS and with the UPS overload characteristics see Table The cable design must comply with the voltages and currents provided in this section, follow local wiring practices and take into consideration the environmental conditions temperature and physical support media.

For cable entry terminal, refer to Figures 43 , 48 , 52 and Check that these supplies are electrically isolated and post any necessary warning signs to prevent their inadvertent operation. For terminal location — refer to 5. Failure to follow adequate earthing procedures may result in electromagnetic interference or in hazards involving electric shock and fire. The operations described in this section must be performed by authorised electricians or qualified technical personnel.

If you have any difficulties, do not hesitate to contact our Customer Service and Support Department. See the back page of this manual for contact information.

Once the equipment has been finally positioned and secured, connect the power cables as described in the following procedure. Refer to the appropriate cable connection drawing in 5. Open the door to the UPS cabinet and remove one of the two protective cover to gain access to the desired connection bars.

The protective cover on the UPS cabinet of 60 to kVA models must be removed after the handles on the power isolators have been removed. Connect the safety earth and any necessary bonding earth cables to the copper earth busbar located on the floor of the equipment below the power connections. The earthing and neutral bonding arrangement must be in accordance with local and national codes of practice. Identify and make power connections for incoming cables according to one of the two procedures below, depending on the type of installation.

Ensure correct phase rotation. For split-bypass operation, ensure that the linking busbars between bypass and rectifier input are removed. The AC input and the AC bypass supplies must be referenced to the same neutral point.

If a frequency converter configuration is used, connect the AC input supply cables to the rectifier input busbars U1-V1-W1-N terminals. For frequency converter operation, ensure that the linking busbars between bypass and rectifier input are removed. Observe the battery cable polarity. When connecting the cables between the battery extremities to the circuit breaker always.

If the load equipment will not be ready to accept power on the arrival of the commissioning engineer, ensure that the system output cables are safely isolated at their ends. The battery consists of a series string connection of 5 x 8 or 10 x 12V 6-cell battery blocks. Ensure that the eight or 10 battery blocks in each tier tray are interconnected.

Connect the positive and negative cables to the UPS terminals. Plug in the cables between the tiers. Ensure correct polarity battery string series connections i.

Ensure correct polarity of string end connections to the UPS terminals, i. Ensure correct polarity of string end connections to the battery circuit breaker and from the battery circuit breaker to the UPS terminals, i. Do not reconnect these links and do not close the battery circuit breaker before authorised by the commissioning engineer.

This interruption. This interruption time may be. This alarm is triggered when the feedback signal and the state of the contactor is not identical for. If the alarm is true, measure the actual output current to verify that the indications are valid. Note 3: When the timer has expired, the inverter Static Switch is opened and the load transferred. The current of inverter IGBT is over limit. If the fault will not reset, contact Liebert Global Services.

Refer to Detail A for dimension to frame with side panel removed. Side panels are removed between adjacent units that are bolted together. Adjustable stops are not designed to carry the full weight of the cabinet.

Finger-tighten stop against the floor, then tighten with a wrench less than two turns for friction against the floor. Figure 31 Dimensions continued—top and bottom views 10mm dia. See Notes 8 and 9 above. All dimensions are millimeters. Top and bottom cable entry available through removable access plates.

Remove, punch to accommodate conduit size and replace. Aluminum and copper-clad aluminum cables are not recommended, 5. All wiring is to be in accordance with national and local electrical codes. All Liebert-supplied cable must be repositioned prior to and while the cabinets are being placed in their final installed location. All interconnection hardware supplied by Liebert 3. All interconnection cables supplied by Liebert when bolted together.

Interconnection cables field-supplied when battery cabinets are stand-alone. Refer to the individual drawing of each piece of equipment for additional details.

Table 11 Run. All interconnection hardware supplied by Liebert. Table 12 Run. All Liebert-supplied cable will need to be repositioned prior to and while setting the cabinets in their installed location. All interconnection cable and hardware supplied by others. Paralleling cabinets must between both UPS modules. Refer to the individual drawing of each piece of equipment for additional details Table 13 Run.

All interconnection cables and hardware supplied by Liebert. AC connections must be made to the UPS module before attaching. See Figure 43 for placement of distribution cabinet. Table 14 Run. All Liebert-supplied cable must be repositioned prior to and while setting the cabinets in their installed location.

All interconnection cables and hardware supplied by others. The interconnecting output cables between the paralleling cabinet and the UPSes must be the same size and the same length. The location of the system output neutral busbar connection K and the ground busbar connections H, I and J are shown for a left-access style. For right-access version, these busbars are at opposite locations 6.

Table The interconnecting input cables between the paralleling cabinet and the UPSes must be the same size and the same length. For right-access version, these busbars are at opposite locations.

The batteries power the load through the inverter in the event of a power failure. The utility source can also power the load through the static bypass. If maintenance or repair of the UPS is necessary, the load can be switched without interruption in service to the maintenance bypass.

During normal system operation the load is connected to the inverter and the inverter contactor is closed; but in the event of a UPS overload or inverter failure, the load is automatically transferred to the static bypass line.

To provide a clean no-break load transfer between the inverter output and static bypass line, the static switch activates, connecting the load to bypass. To achieve this, the inverter output and bypass supply must be fully synchronized during normal operating conditions. This is achieved through the inverter control electronics, which make the inverter frequency track that of the static bypass supply, provided that the bypass remains within an acceptable frequency window.

A manually controlled, maintenance bypass supply is incorporated into the UPS design. It enables the critical load to be powered from the utility bypass supply while the UPS is shut down for routine maintenance.

NOTE When the UPS is operating in bypass mode or on maintenance bypass, the connected equipment is not protected from power failures or surges and sags. Operating Modes The UPS is designed to operate as an on-line, double-conversion, reverse-transfer system in the following modes:.

The rectifier also uses the utility source power to charge the batteries. Battery Mode When utility AC power fails, the NX protects the critical load by instantaneously channeling battery power to the inverter which continues supporting the critical load without interruption. When utility power returns and is within acceptable limits, the NX automatically shifts back to Normal mode, with the rectifier powering the critical load.

Bypass Mode When the NX is in bypass mode, the load is directly supported by utility power and is without battery backup protection. This interruption will be less than 15ms in 50Hz , or less than This interruption time may be altered by modifying the Output transfer interrupt time setting.

Maintenance Mode For maintenance or repair, the NX may be operated in maintenance mode. To place the NX in maintenance mode, the load must be transferred to bypass and the inverter must be turned off. When those conditions are met, the rotary switch may be turned to MAINT and the UPS may be shut down, permitting disconnecting the batteries for maintenance. The UPS input and output must be protected with external overcurrent protection devices. In maintenance mode, the input and output busbars remain energized.

Parallel Redundancy Mode System Expansion For higher capacity, higher reliability or both, the outputs of up to four UPS modules can be programmed for directly paralleling while a built-in parallel controller in each UPS ensures automatic load sharing. The input frequency may vary from 40Hz to 70Hz. In this mode, the static bypass operation is disabled and the battery becomes optional, depending on any requirement to operate in battery mode stored energy mode. The main areas of the control panel are shown below in Figure 46 and detailed in Figure Display Panel Layout Figure 47 shows the control panel in greater detail, identifying individual items that are described in the rest of this section.

Mimic indicators 1. Rectifier indicator 2. Battery indicator 3. Bypass indicator 4. Inverter indicator 5. Load indicator 6. Status indicator. Control buttons 8. Button cover 9. EPO button Mimic Display Indicators The Mimic display on the front panel consists of six indicators arranged in a single-line diagram depicting the various paths of UPS power, as shown in Figure Figure 48 Mimic display indicators location Mimic indicators 1.

The current operational status of the Liebert NX is indicated by the color of the indicators—green, amber or red—and whether they are ON solid , flashing or OFF. Table 18 provides a guide to interpreting the various states of the indicators.

Converter Fault, Batt. Converter Overtemp. Control Buttons The Control Buttons on the front panel may be used to shut down the UPS completely, turn the inverter on or off, restart the UPS after a fault and silence the alarm, as shown in Figure The function of each button is described in Table NOTE To activate a button properly, press and hold until you hear a short beep—about two seconds.

Completely shuts down the UPS, including the static switch. This button completely shuts down the unit and the critical load. Press this button to start the inverter and transfer from static bypass to inverter. Press this button to shut down the inverter during operation. The load will be transferred to static bypass. After the UPS shuts down due to a fault and the alarm condition has been resolved, press this button to clear the fault and restart the UPS.

Press this button once to silence the alarm buzzer when an alarm is active. Any new fault will sound the buzzer again. If the alarm buzzer is not beeping, press this button to test the alarm sound. Press the F1 key below the LCD to scroll through these sections. The LCD displays alarm information in real time.

After appearing in the current status section of the LCD, status messages are stored in the history log— records can be stored and retrieved. Navigation key icons on the LCD appear above each key to indicate its operation see Table The menu choices are listed below and described in detail in Table When not activated, the values are hidden.

To select a different language:. When Intellislot 1 Communication mode is Modem, this parameter sets the number of times a number is redialed to send an alarm notification. When Intellislot 1 Communication mode is Modem, this is the first phone number to be dialed to send an alarm notification. When Intellislot 1 Communication mode is Modem, this is the second phone number to be dialed to send an alarm notification. When Intellislot 1 Communication mode is Modem, this is the third phone number to be dialed to send an alarm notification.

This test performs a partial discharge of the battery to obtain a rough estimate of the battery capacity. This test performs a full discharge of the battery to obtain a precise measure of the battery capacity. This is a self-test of the UPS.

When the user activates this function, a pop-up window appears about 5 seconds later to show the results. Allows a temporary Equalize charge for the batteries. This charge is configurable for 1 to 36 hours. Three status messages are visible in the window at a time. To see other messages, use the navigation keys to scroll up or down the list.

A status message remains in the current status area of the LCD until the status changes, when it is moved to the history log. The history log can hold up to records. History log records may be viewed by accessing the Records menu. See Table 44 in Appendix A for a complete list of status messages, along with a description and any recommended actions. Figure 54 Opening display. This window is the default screen.

Figure 56 Help screen. It remains on the LCD for 2 minutes, then the screen will go dark. The LCD will become active again when any key is pressed. Figure 57 Screen saver window. Pop-Up Windows Pop-up prompt windows appear when the user must confirm a choice or perform an operation. This section describes the pop-up windows. Before transferring, the system will let the user confirm whether the interruption can be accepted, as shown at right.

If the bypass voltage returns to normal before the user makes confirmation, the UPS will transfer to inverter mode automatically. At the same time, the prompt window will close. The user can also cancel the shutdown operation, as shown at right. If the bypass voltage returns to normal before the user makes the confirmation, the UPS will transfer to bypass operation mode automatically, and at the same time the prompt window will disappear soon.

The NX asks for confirmation before the test is started, as shown at right. The pop-up window disappears. User should check whether the battery state is boost charging and whether the load level is greater than 20 percent. User should check if boost charging condition is not enough, such as No battery, charger failed, etc.

This section provides instructions on switching between modes, resetting the UPS, switching the inverter On and Off and performing other operations. No load power is supplied by the UPS. The load is connected to utility power via the Maintenance Bypass Supply line. The load power is supplied through the static bypass line. This may be considered as a temporary mode during load transfers between inverter and maintenance bypass or supply under abnormal operating conditions.

The user controls and indicators mentioned in these procedures are identified in 8. The audible alarm may sound at various points during these procedures. NOTE This unit refers to some modes and conditions that are set or adjusted using proprietary service software. To take advantage of all the available features for the NX, the unit must be commissioned by a Liebert factory-trained service engineer.

Power Switches The UPS can be isolated by means of power switches, mounted inside the cabinet and accessible after opening the front door.

The location of the UPS power switches is shown in Figure Connects the utility supply to the UPS input. Connects the output of the UPS to the load. Connects neutral to the UPS. Connects the UPS with the bypass supply. Permits supply of the load directly by the bypass line for maintenance of the UPS unit. The functions of the rotary switch are shown in Table Allow the rotary switch to stay in each position at least three seconds before turning it to the next position.

Once those general conditions are met, the UPS may be started. Open the UPS door to gain access to the main power switches. During this procedure the output terminals will become live.

If any load equipment is connected to the UPS output terminals, please check with the load user and ascertain whether it is safe to apply power to the load. If the load is not ready to receive power, then ensure that it is safely isolated from the UPS output terminals. Do not operate the rotary switch too fast. Always wait at least three seconds when rotating the switch from one position to another. Turn the rotary switch to TEST. Close CB1. The bypass contactor M2 closes automatically and the LCD begins to show start-up screens.

The Rectifier indicator flashes green while the rectifier is starting up. It stops flashing and becomes solid green about 30 seconds after the rectifier enters the normal operation state.

After initialization, the bypass static switch closes. The bypass indicator extinguishes, provided that the bypass is normal. The opening display is shown in the figure at right. The UPS Mimic display indicators will be:. The UPS powers from static bypass instead of from maintenance bypass. The bypass and load indicators turn on. The design of the rotary switch ensures uninterrupted output. The inverter will start and the inverter indicator will flash green.

After the inverter is ready, the UPS transfers from bypass to inverter, the bypass indicator turns off and the inverter and load indicators turn on. The UPS is operating normally. The UPS Mimic display indicators will:. This breaks the utility connection to the NX. To return to normal mode, close CB1 after a few seconds. The rectifier will restart automatically after 10 seconds and resume feeding power to the inverter. NOTE In bypass mode, the load is being powered by the utility and is not receiving conditioned power through the inverter.

When the inverter is ready, the UPS will switch to normal mode. Before performing this operation, read the messages on the LCD to be sure that bypass supply is regular and the inverter is synchronous with it. If those conditions are not present, there is a risk of a short interruption in powering the load. This procedure assumes that UPS is operating normally. The Inverter indicator will turn off and the status indicator 6 will turn amber and an audible alarm will sound.

The load will transfer to static bypass and the inverter will shut off. NOTE Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message displayed until the appropriate condition is rectified. The load is now on maintenance bypass. Open rectifier switch CB1. All operator indicators and messages will turn off as the utility driven internal power supplies decay.

The unit will power down, but the load will continue to be supplied by the manual Maintenance bypass. Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to remove the internal protective barriers.

Service is to be performed by qualified personnel only. The load equipment is not protected from normal supply aberrations when operating in the maintenance bypass mode. To completely isolate the UPS from the AC supplies, the main external power input isolator both isolators, where separate supplies are provided for rectifier and bypass should be opened see Figure If the UPS needs to be shut down completely while maintaining power to the load, follow these steps: 1.

Perform Steps 1 through 5 in 9. Close the external maintenance bypass rotary switch to Maint postion. On the primary input distribution panel, which is often located distant from the UPS area, a label should be posted advising service personnel that the UPS circuit is under maintenance.

The UPS is now completely powered down. The procedure can be performed only after the installation has been completed which includes the maintenance bypass cabinet , after the system has been placed in operation by authorized personnel. See the reference drawing of Figure 59 for more information. Figure 59 Typical configuration for single UPS with external maintenance bypass cabinet. The system will turn off the rectifier, inverter and stop powering the load immediately including the inverter and bypass , and the battery stops charging or discharging.

To remove all power from the UPS, the external feeder breaker should be opened. Auto Restart When the main and bypass sources fail, the UPS draws power from the battery system to supply the load until the batteries are depleted. When the user confirms that the fault is cleared: 1. NOTE The rectifier will start again, the battery contactor will close and the bypass will begin to power the load.

The Rectifier indicator 1 flashes while the rectifier is starting up. When the rectifier enters the normal operation state about 30 seconds , the rectifier indicator turns green. NOTE The rectifier will be turned on automatically when the overtemperature fault disappears at 5 minutes after the disappearance of overtemperature signals. There will be power at the output terminals of the UPS.

If the rotary switch is in the Maint. After this pre-warning, the battery has the capacity for 5 minutes discharging with full load default time. The NX can be user-configured to display this warning from 3 to 60 minutes before end-of-discharge. Battery End-of-Discharge EOD Protection If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be shut down. If a battery fuse blows, the NX displays the battery fuse-blow warning and the battery converter will be shut down.

NOTE All equipment servicing procedures must be carried out only by trained personnel. Turn Off inverter 2. Power Off unit for maintenance. Unit enters Test Mode by configuration software setting. Diagonosis or testing. Output becomes inhibited because of Isolation Status. Close External Output Circuit Breaker 1.

The UPS exits Isolation Status automatically, parallel signaling and communication recovers, output becomes enabled but interlocking works now. Turn On inverter and join the parallel system. Only qualified service personnel are authorised to remove such covers.

The UPS battery and connecting terminals remains energized at hazardous voltage levels at all times. The battery is located behind protective covers that require a tool for their removal: inside the UPS cabinet, inside a free-standing battery cabinet or on open racks inside a dedicated battery room that may be locked. It is assumed that the installation is complete, the system has been commissioned by authorized personnel and the external power isolators are closed.

Mains voltage will be applied to UPS output terminals. No operator serviceable parts are located behind covers that require a tool for their removal. Rotate the switch to Test position. The LCD becomes active. Close Input breaker CB1 The Rectifier indicator flashes on the UPS mimic panel during the startup of the rectifier and becomes steady green once the rectifier reaches normal operation state after about 30s. Close external battery circuit breaker QF1 where an external battery is used.

This breaker is inside the battery cabinet if used or is otherwise adjacent to the battery racks. After the UPS detects the batteries, the red battery indicator extinguishes when the battery charger starts operation. Rotate switch to Bypass position 7. The inverter will start up and the inverter indicator flashes while it synchronizes to the load voltage and frequency. After the inverter is ready, the UPS connects to the load, the inverter indicator becomes steady green and the output indicator turns green.

This procedure will shut off power to the load. Repeat Steps 1 and 2 for the rest of the units in the system. NOTE If this operation will be performed on multiple units, the procedures should be performed on each unit with as little delay as possible. Turn the rotary switch of each unit in the system to TEST. NOTE The following step will shut off power to the connected load.

Open system output breaker. The load will now be disconnected. All operator indicators and messages will turn off as the utility-driven internal power supplies decay. To isolate a module: a. For systems that have UPS input breakers in paralleling cabinet, open the UPS input breaker for the unit you want to isolate. For systems that do not have UPS input breakers in paralleling cabinet, the utility source to the UPS will need to be opened. In the Bypass Cabinet, rotate the system bypass switch to the Bypass position.

Repeat Steps 2 and 3 for the rest of the units in the system. To isolate the UPS s from the bypass cabinet, open the module input and output isolation breaker s. Check the input and output wiring of each UPS module. Ensure that the phase rotation sequence of the main inputs and the bypass inputs and outputs of each UPS module are the same. Ensure the parallel cables are connected firmly.

Before start up, disconnect the load. Close the system input circuit breaker. Start the UPS as instructed in 9. Close system output circuit breaker. Turn the NX off by following the procedures in 9.

Open system output circuit breaker. Open system input circuit breaker. The UPS will switch to bypass mode. The connected equipment is now powered from the bypass source and is NOT protected. To isolate the UPS from the system, rotate the bypass switch to the maintenance position. The UPS will go to bypass mode. The connected equipment is now powered and protected by the UPS. Rotate Maintenance Bypass Switch to Maintenance position. Post a label on the primary input distribution panel, which often is installed outside the UPS area, advising personnel that the UPS circuit is under maintenance.

Wait 5 minutes for the internal DC busbar capacitors to discharge. The procedure can be performed only after the installation has been completed which includes the maintenance bypass cabinet , after the system has been placed in operation by authorized personnel and after the external power switches have been closed. See Figure 60 for more information. Parallel System Start Up 1. Start each UPS normally as described in 9.

Turn on the inverter of each UPS module one at a time. Apply the load after the last UPS module transfers to inverter. Verify the load rate of each UPS module.

If the load rates are roughly the same, then the parallel system may be assumed to be operating normally. NOTE If one module cannot transfer to inverter mode long after its inverter is on, its output connection may not be good or its output phase rotation may not be coincident with other modules. If either UPS module makes abnormal noise after it transfers to inverter, its parallel cables may be incorrectly connected.

Replacing Dust Filters 1. Open the UPS door. The dust filters are behind the door. For each filter, there is a bracket on either side holding the dust filter in place, as shown in Figure Remove one bracket and loosen the other.

The second bracket need not be removed. Remove the old filter and replace with the new filter 5. Reinstall the bracket that was removed and tighten the other bracket. UPS Environmental The UPS is designed to operate under the following environmental conditions without damage or degradation in electrical operating characteristics: Table Nominal Nom current is based on full rated output load.

UPS input and bypass cables must be run in separate conduit from output cables. Nominal battery voltage is shown at 2. Minimum-sized grounding conductors to be per NEC Parity-sized ground conductors are recommended. Neutral conductors to be sized for full capacity per NEC b 4. References are per NEC Wiring requirements: a. AC Input: 3-phase, 4-wire, plus ground output. AC Output: 3-phase, 3- or 4-wire, plus ground 8. All wiring is to be in accordance with national and local electric codes.

Below are the battery makers and the models they supply. The unit is shipped with a nominal voltage of VDC. Lug Size and Torque Requirements Use commercially available solderless lugs for the wire size required for your application. Refer to Table Connect wire to the lug using tools and procedures specified by the lug manufacturer.

NOTE: Use the values in this table unless the equipment is labeled with a different torque value. Determine the cable length required to reach the NX, then add the appropriate length from the table and adequate slack for repair and maintenance.

For further information on the current status area and the history log, see 2. The RS communication between internal monitor and inverter fails. Contact Liebert Global Services at for assistance.

The RS communication between internal monitor and rectifier fails. Check if there are some UPSes not powered on in the parallel system. If so, power on these UPSs and check if the alarm disappears. Press Fault Clear push button. If alarm does not clear, contact Liebert Global Services at Before the end of discharging, battery under-voltage pre-warning should occur.

After this prewarning, battery should have the capacity for 3 minutes discharging with full load. The time is user configured from 3 to 60 minutes. Shut down the load in time. Mains Voltage exceeds the upper or lower limit and results in rectifier shutdown. Check the input line-to-neutral voltage amplitude of rectifier. Check the input line-to-line voltage amplitude of rectifier.

Mains frequency is out of limit range and results in rectifier shutdown. The temperature of rectifier inductor is too high to keep the rectifier running. Check the ambient temperature and ventilation; contact Liebert Global Services at for assistance.

The temperature of heat sink is too high to keep the rectifier running. The UPS can recover automatically. Check the environment and ventilation. Control Power 1 has failed or has been lost. The current of Rectifier is over limit. Rectifier could not start due to low DC bus voltage. This alarm is triggered by an inverter software routine when the amplitude or frequency of bypass voltage is beyond the normal range. This alarm automatically resets once the bypass voltage goes normal.

First verify that the bypass voltage and frequency displayed on the panel is within the selected range. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and frequency presented to the UPS.