Liebert NXC 40kVA - Backfeed Protection Dry Contact Port; Remote EPO Input Port

Chapter 3 Electrical Installation 23
Liebert NXC 30kVA And 40kVA UPS User Manual
Figure 3-7 BCB port J4
Table 3-6 Description of BCB port J4
Silkscreen
Port
Pin No.
Pin name
Meanings
J4 BCB
4.1 DRV
BCB undervoltage release. Normally 12V,
tripping at 0V
4.2 FB
BCB backfeeding signal input (normally open).
Normally open auxiliary contact signal of BCB:
Auxiliary contact closed upon circuit breaker
closed, while auxiliary contact open upon circuit
breaker open
4.3 GND GND
3.2.4 Backfeed Protection Dry Contact Port
The backfeed protection dry contact port J5 is shown in Figure 3-8 and described in Table 3-7. The rated capacity of
the backfeed protection dry contact is 240Vac/24Vdc, 5A.
Warning
The voltage of the dry contact signal connected to J5 backfeed protection dry contact port may be dangerous. Before connection,
make sure that you are connecting the cable to the right port.
Figure 3-8 Backfeed protection dry contact port J5
Table 3-7 Description of backfeed protection dry contact port J5
Silkscreen
Port
Pin No.
Pin name
Meanings
J5
Rectifier/Bypass
backfeed output
5.2 BFP_O
Rectifier/bypass backfeed normally open contact.
Open when there is no backfeed
5.3
BFP_S
Rectifier/bypass backfeed common contact
5.4 BFP_C
Rectifier/bypass backfeed normally closed
contact. Closed when there is no backfeed
3.2.5 Remote EPO Input Port
The UPS has an EPO function that operates by an EPO button on the operator control and display panel of the UPS or
by a remote contact provided by the user. The EPO switch has a protective cover.
J3 is the remote EPO input port. The port is shown in Figure 3-9 and described in Table 3-8.
1
234
J4
GND
UPS inside
External ports
1
234
J5
UPS inside
External ports