Step 5: Remove The Cover From The Bypass Unit - ABB ACH400 Series Retrofit Manual

 Confirm that the correct circuit has been locked out. The drive
should have no active displays or status lights. Turn the disconnect
/ circuit breaker handle on the bypass unit to "OFF".
! Warning! Dangerous voltages are present when input power is
connected. Wait at least 5 minutes after disconnecting the supply
before removing the cover.

Step 5: Remove the cover from the bypass unit.

R1 and R2 Frames:
 Loosen and remove the two screws on the bottom of the cover. Be
certain not to drop the hardware into other electrical areas.
Lift and remove the cover by swinging it out from the bottom and

sliding the cover pins from the base slots. You may have to manip-
ulate the disconnect / circuit breaker handle to release it from the
shaft as you remove the cover.
R3 and R4 Frames:
 Loosen and remove all screws securing the cover to the base. Be
certain not to drop the hardware into other electrical areas.
 Lift and remove the cover by swinging it out from the bottom. You
may have to manipulate the disconnect / circuit breaker handle to
release it from the shaft as you remove the cover.
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