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To exit the BYPASS mode, Press the OFF/RESET button on the Electronic
bypass keypad.
3.8.2 AUTOMATIC Bypass on VFD Fault
In the Automatic bypass on VFD fault mode of operation, when the Electronic
bypass control board senses a VFD fault it will automatically switch the motor
to BYPASS operation. This function is enabled by DIP switch 1, position 1,
placed in the OFF position.
Automatic bypass will operate in both the VFD AUTO and the VFD HAND
modes of operation. The functionality in each mode is exactly the same.
CAUTION: Use caution when selecting this mode as the motor will accelerate
to full speed anytime the VFD experiences any type of fault condition.
3.8.3 EMERGENCY Bypass
In the unlikely event of a failure of the Electronic bypass control board, an
emergency bypass jumper may be repositioned to enable the Electronic
bypass to be operated as a full voltage fixed speed starter. The emergency
bypass jumper is located on the component side of the door mounted control
board. To change this jumper, use the door interlocked disconnects to
remove power from the Electronic bypass before opening the enclosure door.
Remove the four (4) mounting screws from the control board. Turn the board
so that the component side is facing you. Move jumper J6 from the open
position (normal) to the emergency position. When the enclosure door is
closed and the door interlock in the ON position, the bypass contactor coil will
be immediately energized causing the contactor to close starting the motor at
full across-the-line voltage. The motor thermal overload protection is
disconnected in this mode.
To exit emergency bypass, turn the door interlocked disconnect to the OFF
position. Power to the bypass contactor coil will be removed and the
contactor will open disconnecting the motor. Remove the control board from
the door and move jumper J6 from the emergency position to the open
position. Close the enclosure door and place the door interlock in the ON
position. Control will be returned to the control board for VFD or bypass
operation.
When in Emergency bypass mode the motor thermal overload
relay is disconnected and will not protect the motor from an
overload condition. Damage to the motor may occur.
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