OnLine Power Power Wave 4 - Manual (Page 23)

6005-145 Rev. A 1-12
1.6. Maintenance Bypass
Unlike other ELI, the maintenance bypass switch is already installed inside the
ELI 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 ELI should be disconnected before touching any parts inside
the ELI. 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.
1.7. Main Input Circuit Breaker
The main input circuit breaker provides the unit with incoming power
isolation as a well as means of disconnect and input over current
protection.
1.8. Main Output Circuit Breaker
1.9. Battery Circuit Breaker
1.10. Battery
The battery bank; Provides the reserve energy to sustain the load when
suitable AC input power is not present. The batteries are designed and
tested to meet UL 924 requirements. The standard VRLA (Valve
Regulated Lead Acid) batteries are sealed and maintenance-free.