WEG CFW500 - TROUBLESHOOTING AND MAINTENANCE; FAULT AND ALARMS; SOLUTIONS FOR THE MOST FREQUENT PROBLEMS

CFW500 | 37
Troubleshooting and Maintenance
English
6 TROUBLESHOOTING AND MAINTENANCE
6.1 FAULT AND ALARMS
NOTE!
Refer to the quick reference and to the programming manual of the CFW500
for further information about each fault or alarm.
6.2 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS
Table 6.1: Solutions for the most frequent problems
Problem Point to be Verified Corrective Action
Motor will not
start
Incorrect wiring 1. Check all the power and command connections
Analog reference
(if used)
1. Check if the external signal is properly connected.
2. Check the status of the control potentiometer (if used)
Wrong settings 1. Check if the parameters values are correct for the
application
Fault 1. Check if the inverter is disabled due to a fault condition
Motor stall 1. Decrease the motor overload
2. Increase P0136, P0137 (V/f)
Motor speed
oscillates
Loose connections 1. Stop the inverter, turn off the power supply and tighten all
the 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 content of P0133 (minimum speed) and
P0134 (maximum speed) are properly set for the motor and
application used
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 P0232 to
P0240
Motor nameplate 1. Check whether the motor used matched the application
Display 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
380 / 480 V power supply: - Min: 323 V - Max: 528 V
Main supply fuse open 1. Replace the fuses