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Troubleshooting and Maintenance
6 TROUBLESHOOTING AND MAINTENANCE
6.1 FAULTS AND ALARMS
NOTE!
Refer to the CFW300 quick reference and the programming manual for further
information on each fault or alarm.
6.2 SOLUTION FOR THE MOST FREQUENT PROBLEMS
Table 6.1:
Solution for the most frequent problems
Problem
Point to be Verified
Corrective Action
Motor will not
start
Incorrect wiring
1. Check all power and control connections.
Analog reference
(if used)
1. Check if the external signal is properly connected
2. Check the status of the control potentiometer (if used)
Incorrect settings
1. Check if the parameter values are correct for the application
Fault
1. Check whether the inverter is disabled due to a fault condition
Motor stall
1. Decrease the motor overload
2. Increase P136, P137 (V/f)
Motor speed
oscillates
Loose connections
1. Stop the inverter, turn off the power supply, check and tighten all
the power connections
2. Check all the internal connections of the inverter
Defective speed
reference potentiometer
1. Replace the potentiometer
Oscillation of the external
analog reference
1. Identify the cause of the oscillation. If the cause is electrical noise, use
shielded cables or separate them from the power or command wiring
2. Interconnect the GND of the analog reference to the grounding
connection of the inverter
Too high or
too low motor
speed
Incorrect settings
(reference limits)
1. Check whether the values of P133 (minimum speed) and P134
(maximum speed) are properly set for the used motor and application
Control signal of the
analog reference
(if used)
1. Check the level of the reference control signal
2. Check the setting (gain and offset) of parameters P232 to P240
Motor nameplate
1. Check whether the used motor matches the application
Display is off
HMI connections
1. Check the connections of the inverter external HMI
Power supply voltage
1. Rated values must be within the limits specified below:
200 / 240 V power supply: - Min: 170 V - Max: 264 V
110 / 127 V power supply: - Min: 93 V - Max: 140 V
Mains supply fuses open
1. Replace the fuses.
6.3 INFORMATION NECESSARY FOR CONTACTING TECHNICAL SUPPORT
For technical support or servicing, it is important to have the following information in hand:
Inverter model.
Serial number and manufacturing date listed in the product nameplate (refer to
IDENTIFICATION LABEL on page 7
Installed Software version (refer to P023).
Data on the application and inverter settings.
