Johnson Controls VFD66 Series, Product/Technical Bulletin

Page: 13 / 17

VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin 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.
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.
Table 12: Fault Conditions
Red Alarm
LED
Flashes Condition Definition Possible Cause Solution
Short in motor or leads Check motor and wiring. One Over
Current Fault trips if output
current momentarily
exceeds approximately
200% of output current
rating.
VFD66 control is trying to
accelerate load too quickly or
load is too large. Install jumper on J4 to slow
acceleration/deceleration rate.
Input voltage is too high. Ensure that the input voltage
matches the rating of the model
of the VFD66 control. Two Over
Voltage Fault trips if voltage
exceeds 123% of
nominal.
VFD66 control deceleration
time is shorter than time
needed to stop the load. Install the jumper on J4 to slow
acceleration/deceleration rate.
Mechanical problems Inspect for mechanical problems.
Excessive motor current If overload is continuous, VFD66
control and motor with higher
ratings may be required. Check
motor specifications.
Three Motor
Overload Trips if output current
is 110% for 1 minute.
Motor winding failure 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.
Four not used
Five Pulse
Width
Modulation
Generator
Fault Trips on detection of
abnormal
microprocessor
operation. Internal fault Shut off power. Wait 5 minutes.
Reapply power. If problem
persists, replace VFD66 control.
Six Logic Fault Internal circuitry fault Internal fault Shut off power. Wait 5 minutes.
Reapply power. If problem
persists, replace VFD66 control.