Johnson Controls VFD66 Series Product/Technical Bulletin page 13

After shutdown, there is a 30-second time delay before
the VFD66 control initiates an automatic restart. The
result is one of the following:
If the fault condition is corrected, the VFD66 control
continues to operate. After 500 seconds, the fault
routine resets automatically.
If the fault persists, the VFD66 controls lock out again,
requiring reset.
Table 12: Fault Conditions
Red Alarm Condition
LED
Flashes
One Over
Current
Two Over
Voltage
Three
Motor
Overload
Four not used
Five Pulse
Width
Modulation
Generator
Fault
Six
Logic Fault
Definition Possible Cause
Fault trips if output Short in motor or leads
current momentarily
VFD66 control is trying to
exceeds approximately
accelerate load too quickly or
200% of output current
load is too large.
rating.
Fault trips if voltage Input voltage is too high.
exceeds 123% of
nominal.
VFD66 control deceleration
time is shorter than time
needed to stop the load.
Trips if output current Mechanical problems
is 110% for 1 minute.
Excessive motor current
Motor winding failure
Trips on detection of Internal fault
abnormal
microprocessor
operation.
Internal circuitry fault Internal fault
VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Resetting a Locked-Out VFD66 Control
To reset a locked-out VFD66 control, follow the
procedure below:
1. Disconnect power from the VFD66 control.
2. Wait 5 minutes to allow the internal capacitors to
fully discharge.
3. Reapply power to the VFD66 control.
Solution
Check motor and wiring.
Install jumper on J4 to slow
acceleration/deceleration rate.
Ensure that the input voltage
matches the rating of the model
of the VFD66 control.
Install the jumper on J4 to slow
acceleration/deceleration rate.
Inspect for mechanical problems.
If overload is continuous, VFD66
control and motor with higher
ratings may be required. Check
motor specifications.
Disconnect motor from
VFD66 control. Ensure that
resistance of each motor winding
is within 5% of each other. If
motor windings are defective,
replace motor.
Shut off power. Wait 5 minutes.
Reapply power. If problem
persists, replace VFD66 control.
Shut off power. Wait 5 minutes.
Reapply power. If problem
persists, replace VFD66 control.
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