UPS for 400 Vac Grid, Installation Guide, doc. rel. 3.0
69
4.2.
Emergency Power Off – EPO (manual)
An external Emergency Power Off (EPO) switch should be installed on the UPS by the customer.
The EPO switch cuts all output power to the load in emergency situations.
The connection point for the EPO switch is in connector group 1 (see a two-pin connector on the
static switch of the system (connector group 1). See item P11 in Figure 47: Close-up of
Connector Group 1. The EPO switch must be an N.O.-type, rated for at least 24 Vdc 1 A.
Be sure to perform a continuity test on the EPO switch before connecting it to the
UPS.
4.2.1.
Restarting the UPS after EPO
After the emergency situation that prompted use of the EPO switch has been resolved, the UPS
can be restarted as follows:
To restart the UPS after EPO:
15.
Reset the EPO switch.
16.
Switch OFF all of the following circuit breakers: ac input, bypass ac input, battery.
17.
Wait 1 minute.
18.
Switch on the ac input circuit breaker and the bypass input circuit breaker
19.
Switch ON the battery circuit breaker (on the internal and external battery box)
20.
From the UPS System Menu select
Operation > Turn on/off > System on
.
21.
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.