Alpha Technologies 255A Bypass Switch - Manual (Page 17)

15 0200018-J0 Rev C
7. Operations
1. To allow manual transfer, turn the lockout-key to IN PHASE BYPASS ENABLE
The NORMAL/ BYPASS switch position cannot be changed if power is not present from
either power source. The Alpha MBS operates normally if at least one power source is
present. See Table A.
CAUTION!
The MANUAL OVERRIDE key can be used to change the source selection of the Alpha
MBS even when the inputs are out-of-phase condition. Operating with the inputs out of
phase could cause damage to the critical loads.
CAUTION!
2. When the green IN PHASE lamp is illuminated, turn the
switch on the side panel (Figure 8) to BYPASS.
3. Turn the lockout-key to LOCKED to prevent inadvertent
transfer.
Electro-mechanical
key-operated switch
IN PHASE lamp
Figure 9 — Side panel NORMAL/BYPASS switch
Figure 8 — In phase bypass enable
Refer to section 3.3 to lockout the manual switch with a padlock.
NOTE: