36 VFD66 User Guide
www.johnsoncontrols.com Issue Number: 2
8 Diagnostics
** These trips cannot be reset for 10 seconds after they occur.
Table 8-1 DC bus voltages
Table 8-2 Alarm warnings/Display indications
Do not attempt to carry out internal repairs. Return a faulty drive to the supplier for repair.
Trip code
Condition Possible cause
UV DC bus under voltage Low AC supply voltage
OV DC bus over voltage Deceleration rate set too fast for the inertia of the machine
OI.AC**
Drive output instantaneous over
current
Line to line output fault detected
Line to ground output fault detected
O.SPd Over speed Excessive motor speed
It.AC
I
2
t on drive output current
Excessive mechanical load
High impedance phase to phase or phase to ground short
circuit at drive output
O.ht1
IGBT over heat based on drives
thermal model
Overheat software thermal model
O.ht2 Over heat based on drives heatsink Heatsink temperature exceeds allowable maximum
O.Ld1 User +5V output overload Excessive load or short circuit on +5V output
O.ht3
Drive over-heat based on thermal
model
Overheat software thermal model
EEF Internal drive EEPROM trip
Possible loss of parameter values
(set default parameters (see Pr 29 on page 32))
PH
Input phase imbalance or input
phase loss
One of the input phases has become disconnected from the
drive
rS
Failure to measure motors stator
resistance
Motor too small for drive
Motor cable disconnected during measurement
HFxx trip Hardware faults Internal drive hardware fault
Drive voltage rating UV Trip UV Reset OV trip
200V 175 215 * 415
400V 330 425 * 830
* These are the absolute minimum DC voltages the drives can be supplied by.
Display Condition Solution
OVLd I x t overload (I = current, t = time) Reduce motor current (Load)
hot Heatsink/IGBT temperature high Reduce ambient temperature or reduce motor current
ACLt Drive is in current limit Increase ramp time
FAIL Failed attempt to default drive
An attempt has been made to default the drive when the drive
was not disabled or tripped.
If no action is taken when an alarm warning appears, the drive will trip on the appropriate fault
code.
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