Huawei UPS5000-E-25K-SM User Manual page 38

UPS5000-E-(25 kVA-75 kVA)-SM
User Manual (Half Height)
Silk Screen
PARALLEL
BSC
Dry Contacts
The dry contacts allow the UPS to manage the battery system including the external battery
switch and battery monitoring unit (BMU). They also allow the UPS to provide alarm signals
for external devices and implement remote emergency power-off (EPO).
the dry contacts.
Table 2-7 Dry contacts
Silk Screen
BFP_NO
BFP_COM
BFP_NC
/
BTG
0V
GEN
0V
BCB_OL
Issue 03 (2019-12-13)
Description
The PARALLEL port transmits parallel signals. To connect multiple UPSs
in parallel, use parallel cables to connect the parallel ports on the UPSs. N
UPSs require N parallel cables so that two parallel cables are connected to
each UPS, which improves parallel connection reliability.
This port is used in a dual-bus system to balance output frequencies and
phases between UPS systems, ensuring that two buses can switch with
each other. The BSC port processes UPS system communications
information.
Description
Triggers bypass backfeed
protection.
Reserved
Detects battery grounding
failures.
Port for signal ground
Detects diesel generator
(D.G.) mode.
Port for signal ground
Detects the battery circuit
breaker (BCB) box.
Copyright © Huawei Technologies Co., Ltd.
2 Overview
Table 2-7 describes
Status
Normally, the COM and NC
dry contacts are closed. If
bypass backfeed occurs, the
COM and NO dry contacts are
closed, opening the bypass
input circuit breaker.
N/A
Status:

Closed: battery grounding
failure
 Open: no battery
grounding failure
The initial status is Open.
Status:

Closed: D.G. mode
 Open: non-D.G. mode
The initial status is Open.
Status:
 Grounded: BCB box
connected
 Floated: BCB box not
connected
The initial status is Grounded.
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