Filter
Top Products
Battery Installation
44
4.5 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: 208VAC (L-L)
When a battery ground fault is detected, an alarm will appear on the UPS display panel.
The battery ground fault detection set contains one current transformer and one DC-sensitive
residual current monitor. The connection of this set for UPS is shown in Figure 24.
Figure 24 Wiring of battery ground fault detection set
4.6 Non-Standard Batteries
When batteries other than a matching battery cabinet are used, a remote battery disconnect switch
with overcurrent protection is required per the National Electrical Code. Contact your local Emerson
sales representative about this option. Refer to Figures 67 and 68 for details.
Install battery racks, cabinets and batteries in accordance with the manufacturer's instructions.
Verify that the battery area has adequate ventilation and battery operating temperature complies
with the manufacturer's specifications and with all applicable national and local codes.
If you have any questions concerning batteries, battery racks or accessories, contact Liebert Services
at 1-800-543-2378.
NOTE
The user-supplied battery DC bypass breakers or fuses should have a minimum overload
rating of 8kA and 500V.
Battery Cabinet
Breaker
Battery
Cabinet
208VAC
Current Transformer
W4-A140S
Static Bypass
Module
APM
+12V
BAT_GND
4
2
Batt_+
Batt_-
Batt_N
X
X
J9
Battery Ground
Fault Detection Device
ULC3661SCI
J1
K1 K2 I2 I2
J5
+15V
GND
-15V
UHW241M5
Power Board