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3.4
Dry Contacts
The UPS provides input dry contacts and output dry contacts on the Auxiliary Terminal Block (ATB).
3.4.1
Input Dry Contacts
External input dry contacts are connected via the ATB. Dry contacts are available for environment
detection, battery ground fault detection, etc.
The UPS accepts external signal from zero-voltage (dry) contacts connected through external dry
contact terminals produced, and these terminals are on the static bypass assembly. Through software
programming, these signals become active when these contacts connect to +12V to ground (in the
most left side). The cables connected to the monitor board must be separated from power cables.
Moreover, these cables should be double-insulated with a typical cross-section of 0.5 to 1mm
maximum connection length between 82 and 165ft. (25-50m). The ATB has several input dry contacts.
Figure 19 Input dry contacts
+12V
J9
Table 4
Description of dry contact input port
Position
Name
J9.1
ENV_DET
J9.2
BAT_GND
J9.3
BAT_READY
J9.4
J4.1
J4.2
J4.3
BAT_OUT
J4.4
J5.1
J5.2
J5.3
EXT_OUT
J5.4
J8.1
J8.2
J8.3
J8.4
®
™
Liebert
APM
J4
Description
Detection of battery room environment (normally closed); On Generator; EVN
Battery short to ground detection; BtG; On Generator
Not Used
+12V
+12V power supply
BAT_IN
Internal battery temperature detection
+12V
+12V power supply
External battery temperature detection
GND
Power supply GND
Q3BP
Input circuit breaker status of external Liebert BDC
Q2BP
Output circuit breaker status of external Liebert BDC
Input circuit breaker status of internal Liebert BDC
GND
Power supply GND
DRIVER
BCB Driver Signal
BCB_IN
BCB Contact State
GND
Power Ground
BCB On-Line - Input (N.O.) - This pin will become active when the BCB
ONLINE
interface is connected.
J5
NOTE: The black square () on each connector indicates Pin 1.
Refer to Figure 18 for the location of connectors J4, J5, J8 and J9.
34
Electrical Connections—UPS
2
for a
12V
12V
J8
12V
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