Battery Ground Fault Detection; Figure 74 Battery Ground Fault Detection Set Connections; Table 27 Dry Contact Fault Alarm Signal Is Available For Remote Monitoring - Emerson Liebert NX 400V User Manual

9.1.6

Battery Ground Fault Detection

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 from the battery into the PE (Protective Earth) Residual current
range monitored: 30~3000mA.
Power supply voltage for the set: AC230V (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:
Table 27 Dry contact fault alarm signal is available for remote monitoring
Terminal Name
21 Common
22 NC
24 NO
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.

Figure 74 Battery ground fault detection set connections

Battery
Batt-N
Socket
Output
Phase
Output
Neutral
The Battery Ground Fault Detection Set is assembled within the UPS cabinet.
Definition
Battery Ground Fault Detection – can be
programmed as Alarm or Pre-Alarm
K1
A1
A2
Battery Ground
Fault Detection
Resys B470
(AC230)
108
Options—For Assembly Inside the UPS Cabinet
Current
Transformer
W1-A358
K2 I2 I2
11
14
BCB or
Contactor
X
Monitor Board
-U2
4
+12V
IN DRY-X3
2
BtG
UPS