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

6.3 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS

Problem
Motor does not start Incorrect wiring connection
Analog reference (if used)
Incorrect settings
Fault
Motor stall
Motor speed fluctuates Loose connection
(oscillates)
Defective reference
potentiometer
Oscillation of the external
analog reference
Incorrect settings
(vector control)
Motor speed too high or Incorrect settings
too low (reference limits)
Control signal from the
analog reference (if used)
Motor nameplate
Motor does not reach the Settings
rated speed, or motor
speed starts oscillating
around the rated speed
(Vector Control)
Off display Keypad connections
Power supply voltage
Mains supply fuses open
Motor does not operate in Settings
the field weakning region
(Vector Control)
Low motor speed and Encoder signals are inverted or
P0009 = P0169 or P0170 power connection is inverted
(motor operating with
torque limitation), for
P0202 = 4 - vector with
encoder
Table 6.2 - Solutions for the most frequent problems
Point to be Verified
1. Check all power and control connections. For instance, the digital inputs set to
start/stop, general enable, or no external error shall be connected to the 24 Vdc
or to DGND* terminals (refer to figure 3.18).
1. Check if the external signal is properly connected.
2. Check the status of the control potentiometer (if used).
1. Check if parameters are properly set for the application.
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
Vdc power supply).
1. Decrease motor overload.
2. Increase P0136, P0137 (V/f), or P0169/P0170 (vector control).
1. Stop the inverter, turn off the power supply, and check and tighten all power
connections.
2. Check all internal connections of the inverter.
1. Replace potentiometer.
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.
1. Check parameters P0410, P0412, P0161, P0162, P0175, and P0176.
2. Refer to the Software Manual.
1. Check if the values 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 settings (gain and offset) of parameters P0232 to P0249.
1. Check if the motor has been properly sized for the application.
1. Decrease P0180.
2. Check P0410.
1. Check the inverter keypad connection.
1. Rated values shall be within the limits specified below:
220-230 V power supply:
380-480 V power supply:
1. Replace fuses.
1. Decrease P0180.
1. Check signals A – A, B – B, refer to the incremental encoder interface manual. If
signals are properly installed, exchange two of the output phases. For instance U
and V.
Troubleshooting and Maintenance
Corrective Action
- Minimum: 187 V
- Maximum: 253 V
- Minimum: 323 V
- Maximum: 528 V
6
6-5