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Electronic Bypass Controller Installation and Commissioning Guide
Section 3 - Operation
Precautions:
1. Motor rotation MUST be checked in both VFD and Bypass Modes. Failure to
confirm rotation may cause severe damage to the electronic bypass, motor or its
driven equipment.
2. Only turn ON the input power supply after closing the front door.
3. DO NOT touch the VFD heatsink which operates at a very high temperature.
4. Since it is easy to change operation from low to high speed, verify the safe working
range of the motor and connected load before operation.
5. DO NOT check signals during operation.
6. VFD parameters have been factory set for operation in the electronic bypass
package. DO NOT change these settings, as this will result in improper operation.
Failure to observe these precautions may result in equipment damage, serious
personal injury or death.
3.1 Keypad Operation
The electronic bypass package utilizes two keypads in its operation. The VFD keypad
controls the speed in the Hand Mode using the up and down arrow keys. In Auto
Mode, the user-supplied 4–20 mA speed reference is connected to speed reference
input (M200 terminals 4-6, M400 terminals 5-6, H300 terminals 6–9). The electronic
bypass keypad controls the start/stop of the VFD and bypass as well as reacting to
user-supplied safeties, Fire Alarm input, Damper control, Fireman’s Override, auto
transfer to bypass on VFD fault and other features and functions detailed in this guide.
WARNING
