Electrical Connections
20
3.3 Dry Contacts
The UPS provides input dry contacts and output dry contacts.
3.3.1 Input Dry Contacts
There are several input dry contacts at the X3 slot.
Figure 6 Input dry contacts
3.3.2 Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
NOTE
When operating the Liebert
®
NX
™
with dry contacts, ESD measures must be taken or the
contacts may be damaged.
Table 1 Input dry contacts at X3
Position
Name
Description
J4.1 ENV
3
Battery Room Alarm (Normally Closed)
J4.2 BtG Battery Ground Fault Detection (Normally Closed)
J4.3 GEN
1,2
Generator Detection (Normally Open)
J4.4 +12V +12V Power
1 - Must be configured using configuration software before becoming active.
2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%).
3 - Activating this feature turns the battery charger off.
Table 2 Maintenance bypass cabinet interface
Position
Name
Description
J26.1 T_IT
1
Input transformer over temperature (N.C.)
J26.2 AUX_I Reserved
J26.3 +12V +12V Power
J26.4 GND Power Ground
J30.1 FUSE Reserved
J30.2 F_FAN Fan Fail Alarm (N.C.)
J30.3 T_OT
1
Output Transformer Overtemperature (N.C.)
J30.4 AUX_O Reserved
1
- Must be configured using configuration software before becoming active.
NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.
+12V
GEN
BtG
ENV
GND
GND
+12V
AUX_I
T_IT
AUX_0
T_0T
F_FAN
FUSE
OL
FB
DRV
+12V
+12V+12V
+12V
X3
J4 J26 J30 J10
NOTE: The black square () on each slot indicates Pin 1.
