Pin Name Meanings Pin Name Meanings
1 +12 V BCB drive signal (12 V) 2
PARA_
CAN_H
Parallel CAN1
3
BCB_
STATUS
BCB state signal (24 V, 10 mA) 4
PARA_
CAN_L
Parallel CAN1
5 GND Dry ground 6
PARA_Mon_
CAN_H
Parallel CAN2
7
BCB_
ONLine
BCB on line signal 8
PARA_Mon_
CAN_L
Parallel CAN2
9 PE PE 10
Para_SER_
BUS_H
Parallel CAN3
11 GND Dry ground 12
Para_SER_
BUS_L
Parallel CAN3
13 TMP_BAT Reserved 14 NA Unavailable
15 +12 V Power 16 PE PE
17 GND Dry ground 18
battery_
CAN_H
Battery communication
19
BAT_
Ground_
FAULT
Battery ground fault (24 V, 10 mA) 20
battery_
CAN_L
Battery communication
Table 4.5 Description of Dry Contact Port J3
NOTE: The BCB drive signal and external battery temperature signal must be carried through shielded cables, and
both sides of the shielding coat must be securely connected to the enclosure.
4 Electrical Installation Proprietary and Confidential ©2023 Vertiv Group Corp. 43
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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