Solutions For The Most Frequent Problems; Information For Contacting Technical Support - 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 operate in the field
weakening region (Vector Control)
Off display
Low motor speed and
P0009 = P0169 or P0170 (motor
operating with torque limitation),
for P0202 = 4 - vector with
encoder
6

6.4 INFORMATION 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
Installed software version (check parameter P0023).
Application data and inverter settings.
6-8 | CFW-11
Table 6.2 - Solutions for the most frequent problems
Point to be Verified
Incorrect wiring
connection
Analog reference
(if used)
Incorrect settings
Fault
Motor stall
Loose connection
Defective reference
potentiometer
Oscillation of the
external analog reference
Incorrect settings
(vector control)
Incorrect settings
(reference limits)
Control signal from
the analog reference
(if used)
Motor nameplate
Settings
Keypad connections
Power supply voltage
Blown fuses
Encoder signals are
inverted or power
connection is inverted
Section 2.4 IDENTIFICATION LABELS FOR THE CFW-11 on page
Corrective Action
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
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 programming 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:
200-230 V power supply: - Min: 187 V
- Max: 253 V
380-480 V power supply: - Min: 323 V
- Max: 528 V
1. Replace fuses
1. Check signals A - A, B - B , refer to the incremental encoder (ENC -01 and
ENC-02) interface manual. If signals are properly installed, exchange two of
the output phases. For instance U and V
Figure 3.17 on page 3-29)
2-8).