22 Chapter 3 Electrical Installation
Liebert APM 90 Integrated Modular UPS User Manual
3.2.2 Input Dry Contact Port
The input dry contact ports J7 and J8 provide battery room environment, battery ground fault and battery
temperature signals. The ports are shown in Figure 3-7 and described in Table 3-3.
12V
J7
J8
+12V
BtG
ENV
GND
BAT-OUT
+12V
Figure 3-7 Input dry contact ports J7 and J8
Table 3-3 Description of input dry contact ports J7 and J8
Port Name Description
J7.1 ENV/GEN Battery room environment detection (normally closed)/Generator connected
J7.2 BtG Battery ground fault
J74 +12V +12V power
J8.2 +12V +12V power
J8.3 BAT_OUT Battery temperature detection
J8.4 GND Power ground
1. The default function of J7.1 is 'battery room environment detection', then 'generator connected' must be configured by
configuration software before becoming active. When the function of J7.1 becomes active, the charger current can be
limited through software to a percentage of the full charger current (0
~ 100%).
2. Activating the preceding dry contacts turns the battery charger off.
3.2.3 BCB Port
J6 is the BCB port. The port is shown in Figure 3-8 and described in Table 3-4.
12V
J6
OL
12V 12V
GND
FB
DRV
Figure 3-8 BCB port
Table 3-4 BCB port description
Port Name Description
J6.1 DRV BCB driver signal - (reserved)
J6.2 FB BCB contact state - (reserved)
J6.3 GND Power ground
J6.4 OL BCB online - input (normally open): This pin will become active when the BCB port is connected
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