Troubleshooting And Maintenance; Faults And Alarms; Solution For The Most Frequent Problems - WEG CFW320 User Manual

5 TROUBLESHOOTING AND MAINTENANCE

5.1 FAULTS AND ALARMS

NOTE!
✓
Refer to the CFW320 quick reference and the programming manual for further information on each
fault or alarm.

5.2 SOLUTION FOR THE MOST FREQUENT PROBLEMS

Problem Point to be Verified
Motor will not start Incorrect wiring
Analog reference
(if used)
Incorrect settings
Fault
Motor stall
Motor speed
Loose connections
oscillates
Defective speed
reference potentiometer
Oscillation of the external
analog reference
Too high or
Incorrect settings
too low motor
(reference limits)
speed
Control signal of the
analog reference
(if used)
Motor nameplate
Display is off HMI connections
Power supply voltage
Main supply fuses open
Table 5.1: Solution for the most frequent problems
1. Check all power and control connections
1. Check if the external signal is properly connected
2. Check the status of the control potentiometer (if used)
1. Check if the parameter values are correct for the application
1. Check whether the inverter is disabled due to a fault condition
1. Decrease the motor overload
2. Increase P136, P137 (V/f)
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
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 values of P133 (minimum speed) and P134
(maximum speed) are properly set for the used motor and application
1. Check the level of the reference control signal
2. Check the setting (gain and offset) of parameters P232 to P240
1. Check wheter the used motor matches the application
1. Check the connections of the inverter external HMI
1. Rated values must be within the limits specified below:
200 V Line:
110 - 127 V power supply: Mín: 93 V to Máx: 140 V
200 - 240 V power supply: Mín: 170 V to Máx: 264 V
400 V Line:
380 - 480 V power supply: Mín: 323 V to Máx: 528 V
1. Replace the fuses
TROUBLESHOOTING AND MAINTENANCE
Corrective Action
CFW320 | 27