Troubleshooting And Maintenance; Fault And Alarms; Solutions For The Most Frequent Problems - WEG CFW501 Serie Manual Del Usuario

6 TROUBLESHOOTING AND MAINTENANCE

6.1 FAULT AND ALARMS

NOTE!
Refer to the quick reference and to the programming manual of the
CFW501 for further information about each fault or alarm.

6.2 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS

Problem Point to be Verified
Motor will not Incorrect wiring
start
Analog reference
(if used)
Wrong settings
Fault
Motor stall
Motor speed Loose connections
oscillates
Defective speed
reference
potentiometer
Oscillation of the
external analog
reference
Too high or too Incorrect settings
low motor speed (reference limits)
Control signal of the
analog reference
(if used)
Motor nameplate
Display off HMI connections
Power supply voltage
Main supply fuse open 1. Replace the fuses.
Table 6.1: Solutions for the Most Frequent Problems
1. Check all the power and command connections.
1. Check if the external signal is properly connected.
2. Check the status of the control potentiometer (if used).
1. Check if the parameters values are correct for the
application.
1. Check if the inverter is disabled due to a fault condition.
1. Decrease the motor overload.
2. Increase P0136, P0137 (V/F).
1. Stop the inverter, turn off the power supply and tighten all
the connections.
2. Check all the internal connections of the inverter.
1. Replace the potentiometer.
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.
1. Check whether the content of P0133 (minimum speed) and
P0134 (maximum speed) are properly set for the motor and
application used.
1. Check the level of the reference control signal.
2. Check the setting (gain and offset) of parameters P0232 to
P0240.
1. Check whether the motor used matched the application.
1. Check the connections of the inverter external HMI.
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.
Troubleshooting and Maintenance
Corrective Action
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