MaxPower Corp Gamatronic Power+ M100 - Manuel (Page 17)

Gamatronic Electronic Industries Ltd.
POWER+ 3x208 V, User Guide, Release 2.1 9
How It Works
All three operation modes are encountered during normal UPS use in order to
constantly provide a regulated supply to the load.
During normal use, the UPS provides total power protection to the load.
Using bypass, the load is transferred to power directly from the ac input, bypassing
the inverter. Using this route, there is no protection, but it can be used in the short
term. When power is restored, the UPS returns to normal operation.
In addition to these three operation modes that are negotiated automatically by the
UPS, there are 2 other modes that can only be invoked with manual intervention,
either by the user or the technician:
• Maintenance bypass
• Emergency Power Off (EPO)
Maintenance Bypass
The maintenance bypass switch allows for connecting the load directly to the utility
ac supply, not via the UPS, to enable UPS service and maintenance without
disrupting supply to the load. This switch is only to be used by the service engineer.
Emergency Power Off
An external Emergency Power Off (EPO) switch may be installed by the customer.
The EPO switch cuts power to the load in emergency situations. Once switched off
by the EPO, the POWER+ must be restarted manually.
The EPO switch must be an N.C.-type, rated 120 Vac. Connect the EPO switch to
the two EPO terminals on the UPS.
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.