Electrical Connections—UPS
Liebert
®
APM
™
36
3.4.4 Battery Cabinet Interface Connectors
The battery cabinet interface is on the Auxiliary Terminal Block at J8 and J4. Refer to
the location of connectors J4 and J8 and to
for circuit details.
3.4.5 EPO Input—Optional
NOTICE
Risk of exceeding internal voltage limits. Can cause equipment damage.
Do not apply more than 12V to the Emergency Power Off (EPO) input. Exceeding 12V on this
input can damage the Liebert APM’s internal circuitry and control boards. Exceeding 12V will
also put the Liebert APM in an EPO state, and the unit will not reset, making it non-
functional.
The UPS has an Emergency Power Off (EPO) function operated by a button on the control panel or by
a remote contact provided by the user. The EPO button is under a hinged, clear plastic shield.
The J6 connector, shown in
, is the remote EPO input interface. The EPO has NO/NC
contacts that become active when shorting terminals J6: 3 and 4 or open terminal connection J6: 2
and 1.
If an external Emergency Stop capability is required, it is connected at terminals J6: 1 and 2 and at
J6: 3 and 4 on the monitor board. It also is connected to the Normally Open or Normally Closed
remote stop switch between these two terminals using shielded cable (see
). If
this function is not used, terminals J6:3 and 4 must be opened and J6:1 and 2 must be closed.
Figure 21 EPO wiring and signal names for J6
Table 7
Battery cabinet interface
Position
Name
Description
J4.1
BAT_IN
Internal Battery Temperature Detection
J4.2
+12V
+12V Power Supply
J4.3
BAT_OUT
External Battery Temperature Detection
J4.4
GND
Power Ground
J8.1
DRIVER
BCB Driver Signal
J8.2
BCB_IN
BCB Contact State
J8.3
GND
Power Ground
J8.4
ONLINE
BCB On-Line - Input (N.O.) - This pin will become
active when the BCB interface is connected.
NOTE
All auxiliary cables of terminal must be double-insulated. Wire should be 20-16AWG stranded
for maximum runs between 80 and 200 feet (25-60m), respectively.
NOTE
J6
EPO-NO
EPO-NC
J6
EPO
-N
O
EPO
-N
C
+12V
+12V
+1
2V
+1
2V
NOTE: The black square
(
)
on each
connector indicates Pin 1.
Refer to Figure 18 for the location of
connector J6.