31
6.5.2
RS232 cable specifications
When connecting the UPS with PC by RS232 cable, it needs to use the standard
RS232 cable, the detailed cable NO. are as following:
PIN 1
（
hole
）
to computer serial PIN 2
（
needle
）
to UPS serial
2 2
3 3
5 5
6.5.3
Emergency Power-off
EPO is used to shut down the UPS from a distance. This feature can be used for
shutting down the load and the UPS by thermal relay, for instance in the event of room
overtemperature. When EPO is activated, the UPS shuts down the output and all its
power converters immediately. The UPS remains on to alarm the fault.
There is also a front panel EPO option for user to initial EPO function by pressing the
three switch on the front panel together. When the three switches is pressed down at
the same time, the EPO function will be active, UPS will shut down and the buzzer will
long beep. Pressing startup switches will not turn on the UPS unless the EPO function
is deactivated by pressing the three switches together and press off switches to return
normal status.
EPO Connections
Wire Function Terminal Wire Size Rating Suggested Wire Size
EPO L1
4–0.32 mm2 (12–22 AWG) 0.82 mm2 (18 AWG)
L2
