Vertiv Tech EXS 0080kTK16FN01000, Руководство пользователя

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Vertiv | Liebert EXS 80kVA UPS | User Manual 4
Overview
1.2.3. System Control Principle
Normal Operation
Normal mode: It means that the UPS has normal input mains, the rectifier and inverter operate normally, the load
is supplied by the inverter, the battery circuit breaker is closed, and the battery is in stable floating charge state.
(Parallel System) Note: As the UPS single module outputs are connected in parallel, the system checks that
the inverter control circuits are perfectly synchronized with one another and with the bypass in terms of both
frequency and phase, and that they have the same output voltages. Current supplied to the load is automatically
divided among UPSs. When synchronization is in progress; a warning message is displayed.
Mains Abnormal
When the mains fail or is abnormal, the rectifier will automatically stop working, and the system will transfer to
battery output (through inverter). The length of the operation time in battery mode depends on the load and
the battery capacity. During this period, if the battery voltage drops to the EOD voltage and the mains is still
not recovered, the inverter will automatically stop working, and the UPS operator control and display panel will
display corresponding alarm messages. If the system uses split-bypass configuration and the bypass is normal,
the system will transfer to bypass.
Mains Recovery
When the mains resumes normal within allowable time, the rectifier automatically starts and supplies the load and
charges the battery again. Therefore, the power supply to the load will not be interrupted.
Battery Disconnection
To disconnect the external battery from the UPS system for maintenance, use the external isolating switch.
At present, except for the battery backup function upon mains failure, other functions and all the steady state
performance of the UPS will not be affected.
UPS Module Failure
In case of inverter failure and output fuse blowout, the load is automatically transfered to the bypass, and the
output power supply is not interrupted. In this situation, please contact the local customer service center of Vertiv
Tech Ltd 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
without interruption. If the remaining modules are no longer capable of fulfilling the power requirements, the
load will be transferred automatically to the bypass.