WEG CFW700 User Manual - page 57

52 | CFW700

Troubleshooting and Maintenance

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6 TROUBLESHOOTING AND MAINTENANCE

6.1 FAULTS AND ALARMS

NOTE!

Refer to the CFW700 quick reference guide and the programming manual for 

more information about the errors and alarms.

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 does not start  Incorrect wiring 

connection 

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 parameters are properly set for the application.

Fault 

1. Check if the inverter is not blocked due to a fault condition. 

2. Check if terminals XC1:15 and 16 and/or XC1:34 and 36 

are not shorted (short-circuit at the 24 Vdc power supply).

Motor stall 

1. Decrease motor overload.

2. Increase P0136, P0137 (V/f), or P0169/P0170 (vector 

control).

Motor speed 

fluctuates (oscillates) 

Loose connection  1. Stop the inverter, turn off the power supply, and check 

and tighten all power connections.

 2. Check all internal connections of the inverter.

Defective reference 

potentiometer 

1. Replace potentiometer.

Oscillation of the 

external analog 

reference 

1. Identify the cause of the oscillation. If it is caused by 

electrical noise, use shielded cables or separate from the 

power and control wiring. 

Incorrect settings 

(vector control) 

1. Check parameters P0410, P0412, P0161, P0162, P0175, 

and P0176. 

2. Refer to the programming manual.

Motor speed too 

high or too low 

Incorrect settings 

(reference limits)

1. Check if the values of P0133 (Minimum Speed) and 

P0134 (Maximum Speed) are properly set for the motor 

and application used. 

Control signal 

from the analog 

reference (if used) 

1. Check the level of the reference control signal.

2. Check the settings (gain and offset) of parameters P0232 

to P0240.

Motor nameplate

1. Check if the motor has been properly sized for the 

application. 

Motor does not 

reach the  rated 

speed, or motor  

speed starts 

oscillating  around 

the rated speed 

(Vector Control) 

Settings 

1. Decrease P0180. 

2. Check P0410.