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Options—For Assembly Inside the UPS Cabinet
66
8.0 OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET
Several items of optional equipment are available for connection to the Liebert NX UPS. These are
described in this section of the manual and should be fitted prior to installation.
8.1 Protection
8.1.1 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:
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 36 Battery ground fault detection set connections
Table 24 Dry contact fault alarm signal is available for remote monitoring
Terminal Name Definition
21 Common
Battery Ground Fault Detection – can be
programmed as Alarm or Pre-Alarm
22 NC
24 NO
BCB or
Contactor
Battery
Socket
Output
Phase
Output
Neutral
Current Transformer
W1-A358 (installed
externally only)
Monitor Board
-U2
UPS
IN DRY-X3
+12V
BtG
Battery Ground
Fault Detection
Resys B470
(AC230)
11
14
A1
A2
K1 K2 I2 I2
4
2
Batt +
Batt -
Batt-N
X
X