Service manual

Always On UPS Systems Inc

d. Close the Bypass breaker – The reserve breaker and reserve static switch are

still conducting. When the maintenance bypass breaker is closed, power will

flow through the bypass loop instead of the reserve loop because the impedance

of the bypass loop is lower.

e. Open the Reserve breaker – You can now open the reserve breaker to put the

ups into manual bypass.

NOTE: To place the unit into Maintenance Bypass mode the fuse holders behind the control

module (where all control PCB’s are stored) must be opened.

The system is now in Manual Bypass mode (or Maintenance Bypass mode).

CAUTION!

If fuse holders have not been opened power is still present and fans will be turning. If fuse

holders are open power is still present at the terminal strip and several terminals on the

PCB’s