Solutions For The Most Frequent Problems - WEG CFW-11 User Manual

Troubleshooting and Maintenance

6.3 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS

Problem
Motor does not start
Motor speed fluctuates
(oscillates)
Motor speed too high or
too low
Motor does not reach the
rated speed, or motor
speed starts oscillating
around the rated speed
(Vector Control)
Off display
6
Motor does not operate in
the field weakning region
(Vector Control)
Low motor speed and
P0009 = P0169 or P0170
(motor operating with
torque limitation), for
P0202 = 4 - vector with
encoder
6-8 | CFW-11
Table 6.2 - Solutions for the most frequent problems
Point to be Verified
Incorrect wiring 1. Check all power and control connections. For instance, the digital inputs set to
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 XC1:13 and XC1:11 are not shorted (short-circuit at the 24
Motor stall 1. Decrease motor overload
2. Increase P0136, P0137 (V/f), or P0169/P0170 (vector control)
Loose connection 1. Stop the inverter, turn off the power supply, and tighten all power connections
2. Check all internal connections of the inverter
Defective reference 1. Replace potentiometer
potentiometer
Oscillation of the external 1. Identify the cause of the oscillation. If it is caused by electrical noise, use shielded
analog reference
Incorrect settings 1. Check parameters P0410, P0412, P0161, P0162, P0175, and P0176
(vector control) 2. Refer to the programming manual
Incorrect settings 1. Check if the values of P0133 (minimum speed) and P0134 (maximum speed) are
(reference limits)
Control signal from the 1. Check the level of the reference control signal
analog reference (if used) 2. Check the settings (gain and offset) of parameters P0232 to P0249
Motor nameplate 1. Check if the motor has been properly sized for the application
Settings 1. Decrease P0180
2. Check P0410
Keypad connections 1. Check the inverter keypad connection
Power supply voltage 1. Rated values shall be within the limits specified below:
220 / 230 V power supply: - Minimum: 187 V
380 / 480 V power supply: - Minimum: 323 V
Mains supply fuses open 1. Replace fuses
Settings 1. Decrease P0180
Encoder signals are inverted or 1. Check signals A – A, B – B, refer to the incremental encoder interface manual. If
power connection is inverted
Corrective Action
Start/Stop, General Enable, or no external error shall be connected to the 24 Vdc
or to DGND* terminals (refer to Figure 3.19 on page
Vdc power supply)
cables or separate from the power and control wiring
properly set for the motor and application used
- Maximum: 253 V
- Maximum: 528 V
signals are properly installed, exchange two of the output phases. For instance U
and V
3-27)