Parallel System and LBS System Installation
43
Liebert
®
APM
™
Figure 28 Locations of ports J1, J2 and J3 on bypass module
4.2.9 Remote EPO
In addition to the EPO switch provided on the operator control and display panel of each UPS module
for controlling the EPO of each module respectively, the parallel system also provides remote EPO
function for controlling all UPS modules to shut down simultaneously from a remote terminal, as
shown in
.
Figure 29 Remote Emergency Power Off wiring for parallel UPS
NOTE
1. The remote EPO switch must provide a dry contact signal, which is normally open or
closed.
2. The open circuit voltage provided is 5VDC, <20mA.
3. The external EPO device can be composed of another control system that can disconnect the
UPS mains supply or the bypass input.
4. Pins 1 and 2 of the normally closed EPO-J6 port on the bypass module are connected at the
factory.
Input/output dry contact and EPO/BCB/MBC interface
J1
J4
J7
J10
MFP_O
MFP_S
MFP_C
J11
INPUT_2
INPUT_1
OUT
GND
J8
+12V
BA
T
-IN
BA
T
-OUT
GND
J5
PARA
J2
BCB_IN
DRIVER
GND
ONLINE
Q2BP
Q3BP
EXT
-OUT
GND
J9
J6
J3
PARA
BFP_O
BFP_S
BFP_C
J12
INV_O
INV_S
INV_C
BA
T_GND
ENV_DET
BA
T_READY
+12V
+12V
EPO-NC
+12V
EPO-NO
LBS
MONITOR
RS485-2
RS485-1
RS232
INTELLISLOT3
INTELLISLOT2
INTELLISLOT1
J1 ~ J3 port can’t connect to phone!
J1
J2
J3
UAM04031-00
Rev. 1
Field-Supplied Wiring
UHRF3S67X2 (J6)
UHRF3S67X2
UHRF3S67X2
Remote EPO
(Customer-
Supplied)
Liebert APM
Bypass Module
Liebert APM
Bypass Module 1
Liebert APM
Bypass Module 2
Two Liebert APM
Modules in Parallel
X2_J6
X2_J6