Johnson Controls VFD66 Series Product/Technical Bulletin page 14

Table 14: Fault Conditions
Red LED Condition
Flashes
1 Over
Current
2 Over
Voltage
3 Motor
Overload
4
5 Pulse
Width
Modulation
Generator
Fault
6 Logic Fault
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.
14 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Definition
Fault trips if output
current momentarily
exceeds approximately
200% of output current
rating.
Fault trips if voltage
exceeds 123% of
nominal.
Trips if output current is
110% for 1 minute.
Trips on detection of
abnormal microprocessor
operation.
Internal circuitry fault
Possible Cause
Short in motor or leads
VFD66 control is trying to
accelerate load too quickly or
load is too large.
Input voltage is too high.
VFD66 control deceleration
time is shorter than time
needed to stop the load.
Mechanical problems
Excessive motor current
Motor winding failure
not used
Internal fault
Internal fault
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.