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HONEYWELL VFD CORE THREE CONTACTOR BYPASS ASSEMBLIES
OPERATION
1. Make sure bypass panel and motor are properly
grounded
2. Make sure all wire connection points are tight, including
all bypass panel connection points.
3. Make sure all safeties (customer option, such as smoke
detector or fire alarm) are connected and in working
order.
4. Double check correct voltage is being applied and
power and motor wires are terminated in the correct
place.
5. Verify motor FLA does not exceed VFD output amp
rating and bypass starter overload relay setting dial.
6. Set bypass starter overload relay adjustment dial to
motor FLA.
7. Verify building automation system is ready for start,
stop, speed command; all wires are terminated in the
correct location.
8. Make sure all personnel, debris, etc are clear.
Before applying power, verify main input disconnect
handle is in the "OFF" position; "Bypass/Off/Test/VFD"
selector switch is in the "OFF" position and all
personnel, debris and equipment are clear of the VFD and
Bypass.
1. Apply input power, check three phase voltage on line
side of main disconnect switch.
2. Turn main disconnect handle to "ON" position.
3. Turn "Bypass/Off/Test/VFD" selector switch to "Test"
position. Enter all appropriate parameters in "Startup
Wizard" and all motor nameplate data. See VFD CORE
manuals.
4. Turn "Bypass/Off/Test/VFD" selector switch to "VFD"
position. Press "Hand" button for local (keypad) control.
See VFD CORE manuals. Start VFD and check motor
rotation.
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
(1) If motor is rotating backwards in VFD mode, shut
down power, lock out power source, wait until
VFD stored energy has dissipated, switch
incoming motor wires on the "T1" and "T2"
terminals in the bypass panel, or motor wires
"T1" and "T2" in the motor junction box.
Reenergize power and check rotation of motor
again.
5. Turn "Bypass/Off/Test/VFD" selector switch to "Off"
position. Wait for motor to stop. Turn selector switch to
"Bypass" position then back to "Off" position. Do not
leave the motor running in "Bypass" position. Check
motor rotation.
(1) If motor is rotating backwards in Bypass mode,
shut down power, lock out power source, test
incoming voltage on incoming line power wiring
to line side of main disconnect switch. Once it is
established that power is shut down, swap
incoming wires on "L1" and "L2" of main
disconnect switch. Re-energize power and check
rotation again.
CAUTION
Letting motor run the incorrect direction in bypass
mode can cause equipment damage.
Bypass panel "Bypass/Off/Test/VFD" selector switch has
four operating positions:
1. VFD: Device directs power to VFD first, then to the
motor. VFD controls the motor as it would without the
bypass panel.
2. OFF: Device stops power. Power is cut off to the motor
and the VFD.
3. TEST: Device directs power to VFD only. This allows for
VFD calibration, adjustments, and diagnostics.
4. BYPASS: Device directs power to motor only. Cuts
power to the VFD. The motor operates at full speed with
full power.
® U.S. Registered Trademark
© 2012 Honeywell International Inc.
62-2027—01
M.S. 03-12
Printed in United States
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