Georator Triathlon III T3UPS-13-15K, Instruction Manual

Page: 17 / 98

The transfer action is determined according to the reserve-input voltage and frequency
to protect supplying incorrect power to the load. Finally, there is a double check by the
CPU as to whether the transfer is successful or not.
1.6. Maintenance Bypass Switch
Unlike other UPS, the maintenance bypass switch is already installed inside the UPS
for convenience. It should be open under normal operation, and only closed during
maintenance. For the sake of safety of maintenance personnel, all power supplies
inside the UPS should be disconnected before touching any parts inside the UPS.
Thus, the maintenance bypass switch is a necessity to maintain AC power at the output
and yet keep maintenance personnel safe at the same time. If the bypass breaker is
closed under normal operation, the inverter will stop and the load will be automatically
transferred to reserve to prevent the inverter connecting directly to the AC source. Of
course, you cannot switch on the inverter as long as the maintenance bypass breaker is
closed.
To properly use the maintenance bypass breaker, switch off the inverter first. The
static switch will automatically transfer the load to reserve without dead time. Then
one can close the maintenance bypass breaker, then open the reserve breaker, so that
the load gets power from the output without interruption.
1-12