Backfeed Protection Dry Contact Port; Remote Epo Input Port - Liebert NXC 30kVA User Manual

Silkscreen
J4

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.
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.
Silkscreen
Rectifier/Bypass
J5
backfeed output

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.
J4
4
Figure 3-7 BCB port J4
Table 3-6 Description of BCB port J4
Port Pin No.
4.1
BCB
4.2
4.3
J5
4
Figure 3-8 Backfeed protection dry contact port J5
Table 3-7 Description of backfeed protection dry contact port J5
Port Pin No.
5.2
5.3
5.4
Liebert NXC 30kVA And 40kVA UPS User Manual
Chapter 3 Electrical Installation
UPS inside
External ports
3 2 1
Pin name
BCB undervoltage release. Normally 12V,
DRV
tripping at 0V
BCB backfeeding signal input (normally open).
Normally open auxiliary contact signal of BCB:
FB Auxiliary contact closed upon circuit breaker
closed, while auxiliary contact open upon circuit
breaker open
GND GND
Warning
UPS inside
External ports
3 2 1
Pin name
Rectifier/bypass backfeed normally open contact.
BFP_O
Open when there is no backfeed
BFP_S Rectifier/bypass backfeed common contact
Rectifier/bypass backfeed normally closed
BFP_C
contact. Closed when there is no backfeed
Meanings
Meanings
23