Electrical Connections—UPS
Liebert
®
eXM
™
28
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
2
for a
maximum connection length between 82 and 165ft. (25-50m). The ATB has several input dry contacts.
Figure 15 Input dry contacts
J26
2468
10 12
14
16 18 20
22 24
26
28
30 32
GEN MODE
+12V_DR
Y
GND_DR
Y
GND_DR
Y
TMP BATT IN
_
RESERVED
ENV_DET
GND_DR
Y
CHG SHUT
GND_DR
Y
RESV1
UT2 485+
UT2 485-
GND_DR
Y
NC
NC
135791113151719212325272931
Q1 STATUS
GND_DRY
Q2 STATUS
GND_DRY
Q3 STATUS
GND_DRY
Q5 STATUS
GND_DRY
GND_DRY
RESV2
RESV3
GND_DRY
UT1 485+
GND_MON
UT1 485-
NC
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