MaxPower Corp Gamatronic Power+ M50-RM - Manual (Page 61)

Gamatronic Electronic Industries Ltd.
POWER+ RM 50 K VA, N.Am. Std. – User Guide, Release 1.9 45
5.8.1 Load on Bypass Alarm
This output dry contact is Normally Open, and closes when the UPS transfers the load to bypass
(Figure 35). The dry contact reopens again when the UPS returns to inverter mode.
5.8.2 Battery Trip Coil
The battery trip coil terminals are intended to be connected to the trip coil of the battery circuit
breaker (Figure 35). If this is done and the EPO switch is activated, the POWER+ RM 50 kVA
sends a pulse of 120 V to the battery circuit breaker trip coil, causing the battery circuit breaker to
turn OFF.
Use of the battery trip coil means that not only will use of the EPO switch cut all ac output from
the UPS, it will also turn off the battery circuit breaker.
5.8.3 Emergency Power-off
An external Emergency Power-Off (EPO) switch can be installed by the customer to enable
immediate shutdown of the UPS. Once switched off by the EPO, the POWER+ must be restarted
manually.
The UPS has two terminals marked "EPO" for connection of an EPO switch (Figure 35). Use of a
large mushroom-type N.O. (normally open) pushbutton rated for not less than 1 A / 24 Vdc is
recommended. Verify continuity of the switch at its connection points before installing.
In the event that the POWER+ UPS is used in a computer room, installation of the EPO
switch is mandatory. It is also required in this case that activating the EPO switch should
disconnect the dc power supply from the batteries. The battery CB terminals on the POWER+
must be connected to the trip coil terminals on the battery cabinet (see section 5.8.2).
To restart the UPS following use of the EPO, turn off all input circuit breakers (rectifier ac input,
bypass ac input, battery) and then start the POWER+ as normal (see section 6, starting on page
66).