14
Electronic Bypass Controller Installation and Commissioning Guide
2.6 Inspection
Once all wiring is complete, verify that:
1. All wiring is installed.
2.
Excess screws, metal filings and wire clippings are removed from inside the unit(s).
3. Screws and fasteners are securely tightened.
4. Exposed wiring has no contact with other wiring or terminals.
2.7 Checking Motor Rotation
Before attempting a trial operation of the electronic bypass package, ensure that the
enclosure door is securely closed. Also, ensure all personnel are clear of the connected
load as this operation will energize and rotate the motor. After applying 3 phase power
to the electronic bypass package, ensure that the MAIN POWER LED is illuminated. If any
alarms are illuminated, refer to Section 6 for explanation.
There is no standard for the rotational direction of an induction motor based
on the motor lead markings. This, plus the uncertainty of the phase rotation
of the utility power being applied to the electronic bypass package terminals,
requires that the motor rotation direction be checked and be correct in both VFD
and Bypass Modes. Failure to confirm rotation may cause severe damage to the
electronic bypass package, motor or the driven equipment.
2.7.1 Check #1: Rotation on VFD power
Place the VFD package in Hand (local) Mode control by pressing the VFD and HAND
push buttons on the electronic bypass keypad. The VFD, HAND, INPUT and OUTPUT
CONTACTOR LEDs will be illuminated. The VFD must be started and stopped by the
START/STOP buttons on the VFD keypad. Use the up arrow on the VFD keypad to
increase the speed reference of the VFD or the down arrow on the VFD keypad to
decrease the speed reference of the VFD. Note the direction of rotation as the motor
shaft begins to rotate as compared to the required rotation direction.
To stop the VFD, press the OFF/RESET push button.
WARNING
