WEG CFW-11 User Manual - page 98

Troubleshooting and Maintenance

6

6-8 | CFW-11

6.3 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS

Table 6.2 - Solutions for the most frequent problems

Problem

Point to be Verified

Corrective Action

Motor does not start

Incorrect wiring

1.  Check all power and control connections. For instance, the digital inputs set to 

start/stop, general enable, or no external error must be connected to the 24 Vdc 

or to DGND* terminals (refer to 

Figure 3.16 on page 3-31

)

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

2.  Make sure that the terminals XC1:13 and XC1:11 are not shorted (short-circuit 

at the 24 Vdc power supply)

Stalled motor

1.  Decrease the motor overload

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

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 it is caused by electrical noise, use shielded 

cables or separate them 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

Too high or too low motor

speed

Incorrect settings

(reference limits)

1.  Check whether the values of P0133 (minimum speed) and P0134 (maximum 

speed) are properly set for the used motor and application

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 P0249

Motor nameplate

1.  Check whether the used motor matches 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

Display is off

Keypad connections

1.  Check the inverter keypad connection

Power supply voltage

1.  Rated values must be within the limits specified below:

380-480 V power supply: - Minimum: 323 V

                                      - Maximum: 528 V

Mains supply fuses open

1.  Replace the fuses

Motor does not operate in

the field weakening region

(Vector Control)

Settings

1.  Decrease P0180

Low motor speed and

P0009 = P0169 or

P0170 (motor operating

with torque limitation), for

P0202 = 4 - vector with

encoder

Encoder signals are inverted 

or power connections are 

inverted

1.  Check signals A - A, B - B , refer to the incremental encoder interface manual. 

If signals are properly wired, invert two of the output phases. For instance U 

and V

6.4 INFORMATION NECESSARY FOR CONTACTING TECHNICAL SUPPORT

 NOTE!

For technical support and servicing, it is important to have the following information in hand:

   Inverter model. 

  Serial number, manufacturing date, and hardware revision that are listed in the product nameplate 

(refer to the 

Section 2.4 CFW-11 IDENTIFICATION LABELS on page 2-12

). 

   Installed software version (check parameter P0023). 

   Application data and inverter settings.