UPS for 208 Vac Grid, B120US Installation Guide, doc. rel. 3.0
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To restart the UPS after EPO:
5.
Reset the EPO switch.
6.
Switch OFF all of the following circuit breakers: ac input, bypass ac input, battery.
7.
Wait 1 minute.
8.
Switch on the ac input circuit breaker and the bypass input circuit breaker
9.
Switch ON the battery circuit breaker (on the internal and external battery box)
10.
From the UPS System Menu select
Operation > Turn on/off > System on
.
11.
Wait until the two LEDs on the left front of all power modules are green and the system
transfers the load from bypass to inverter.
This takes about 2 minutes.
The UPS is now operating normally.
4.3.
Surge Protector Malfunction Alarm
The UPS is equipped with a MOV-type (Metal Oxide Varistor) surge arrestor. If the surge arrestor
malfunctions, a system alarm is generated. The MOV surge protector makes use of one of the
input dry contacts to transmit the alarm to the UPS. This relay is normally open, and closes when
the surge arrestor detects a malfunction.
4.4.
LVD Battery Protector
The LVD battery protector is a mechanism that protects the batteries from deep discharge.
For additional information about the LVD battery protector, refer to the
UPS User
Guide
.
The Battery CB trip coil must have a tripping voltage of 48 Vdc to be supplied from the system.