UPS module failure
In case of inverter failure and output fuse blowout, the load will automatically transfer to the bypass, and the output power
supply will not be interrupted. In this situation, please contact the local customer service center of Vertiv for technical
support.
(Parallel System)
In the event of a fault in a UPS module, it will automatically exit from the parallel system. If the system is
still capable of providing the required load, the remaining modules will continue to supply the load with no interruption. If
the remaining modules are no longer capable of fulfilling the power requirements, the load will automatically transfer to the
bypass.
Overload
If the inverter is overloaded or the inverter current remains outside the specifications (refer to Table 12.6 on page 174)
longer than the specified time, the load will automatically transfer to the bypass without power interruption. If both the
overload and the current are reduced to a level within the specified range, then the load will be transferred back to the
inverter. In case of output short circuit, the load will be transferred to the bypass, and the inverter will shut down. Five
minutes later, the inverter will start up automatically. If the short circuit is removed at this point, the load will be transferred
back to the inverter. The transfer is determined first of all by the features of the protective device of the system.
In the above two situations, the UPS touch screen will display alarm messages.
(Parallel System)
The control logic system constantly monitors load requirements and controls the power supplied by each
UPS module. In the event that an overload condition is sustained for greater than a preset time, the load will transfer to the
bypass, when the number of active modules is unable to satisfy load requirements. The load returns to the inverter if the
power is reduced to a value that can be sustained by the number of active modules in the system.
Maintenance bypass
The UPS has a second bypass circuit, i.e. maintenance bypass (without switch excluded), which provides a safe working
environment for the engineers to provide regular maintenance or repair to the UPS system and at the same time provide
unregulated mains supply to the loads. The maintenance bypass can be manually selected through the maintenance bypass
switch, and it can be disconnected by turning the switch to OFF.
W A R N IN G ! If th e UP S system co n sists o f two o r m o re UP S m o du les an d wh en th e lo ad capacity
exceeds th e sin gle m o du le capacity, do n o t u se th e in tern al m ain ten an ce bypass switch .
2 Overview
14
Vertiv™ Liebert® APM Plus User Manual
Summary of Contents for APM Plus 0500kMK16FN02000
Page 1: ...Vertiv Liebert APM Plus User Manual 50 500 kVA UPS...
Page 8: ...vi This page intentionally left blank Vertiv Liebert APM Plus User Manual...
Page 34: ...2 Overview 26 This page intentionally left blank Vertiv Liebert APM Plus User Manual...
Page 45: ...Four switches 500 kVA 3 Mechanical Installation 37 Vertiv Liebert APM Plus User Manual...
Page 76: ...Figure 5 11 Customize the display 5 Touch Screen 68 Vertiv Liebert APM Plus User Manual...
Page 86: ...Figure 5 20 Enable module redundancy 5 Touch Screen 78 Vertiv Liebert APM Plus User Manual...
Page 91: ...Figure 5 24 Status Gauge setting options 5 Touch Screen 83 Vertiv Liebert APM Plus User Manual...
Page 92: ...5 Touch Screen 84 Vertiv Liebert APM Plus User Manual...
Page 94: ...5 Touch Screen 86 Vertiv Liebert APM Plus User Manual...
Page 95: ...Figure 5 26 Unit status Bypass details 5 Touch Screen 87 Vertiv Liebert APM Plus User Manual...
Page 96: ...Figure 5 27 Unit status Battery details 5 Touch Screen 88 Vertiv Liebert APM Plus User Manual...
Page 97: ...Figure 5 28 Unit status Load details 5 Touch Screen 89 Vertiv Liebert APM Plus User Manual...
Page 100: ...5 Touch Screen 92 Vertiv Liebert APM Plus User Manual...
Page 112: ...5 Touch Screen 104 This page intentionally left blank Vertiv Liebert APM Plus User Manual...
Page 184: ...12 Specifications 176 This page intentionally left blank Vertiv Liebert APM Plus User Manual...