Maintenance to Bypass
•
Check all the enclosures of bypass unit are properly closed and ready for operation
•
Unlock the mode selection switch
•
Set the mode selection switch to "Local position" or "Remote position"
•
Lock the mode selection switch
•
Close KM3
•
Close QF1.
VFD to Bypass
•
Open QF1
Hint: In case need to switch between"Local position" and "Remote position", please
apply step 2 to step 4, otherwise skip to step 5.
•
Unlock the mode selection switch
•
Set the mode selection switch to "Local position" or "Remote position"
•
Lock the mode selection switch
•
Open KM2
•
Open KM1
•
Wait for at least 3 x rotor time constant (if not available, wait for longer than 5s)
•
Close KM3
•
Close QF1.
Bypass to VFD
•
Open QF1
Hint: In case need to switch between "Local position" and "Remote position", please
apply step 2 to step 4, otherwise skip to step 5.
•
Unlock the mode selection switch
•
Set the mode selection switch to "Local position" or "Remote position"
•
Lock the mode selection switch
•
Open KM3
•
Close KM1
•
Close KM2
•
Close QF1.
Operation principle and hardware description 27