Chapter 9 Product Specifications
LIEBERT APM UPS Module And Parallel System 30kVA~150kVA User Manual
Chapter 8 Optional Parts
This chapter introduces the optional parts of LIEBERT APM UPS. The optional parts should be installed before the
UPS installation.
8.1 Battery Ground Fault Detection Set
In addition to any residual current device mounted externally and upstream the UPS or when optional isolation
transformers are fitted to the UPS, an optional residual battery current device can be fitted to detect leakage current
so as to ensure the normal operation of the system. Residual current range monitored: 30mA ~ 3000mA
Power supply: 230Vac (L-N)
When a battery ground fault is detected, an alarm will appear on the UPS display panel.
An additional Dry contact fault Alarm signal is available for remote monitoring:
Terminal Name Definition
21 Common
22 NC
24 NO
Battery Ground Fault Detection – can be programmed as Alarm or Pre-Alarm
Tab.
8-1: Dry contact fault alarm signal is available for remote monitoring
The Battery ground fault detection set contains one CT (current transformer) and one DC sensitive residual current
monitor. The connection of this set for UPS is illustrated as follows:
K1
11
14
4
2
A1
A2
BtG
IN DRY-X3
Battery
Current transformer
Battery circuit
breaker or contactor
Maintenance socket
Output hot line
Output neutral line
Batt_+
Batt_N
Batt_-
W1-A358
Monitoring
board-U2
+12V
UPS
K2 I2 I2
Battery grounding fault
detection device
B470(AC230)
Fig.
8-1:
Wiring of battery ground fault detection set
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