Troubleshooting And Maintenance; Faults And Alarms; Solutions For The Most Frequent Problems - WEG CFW701 User Manual

Troubleshooting and Maintenance

6 TROUBLESHOOTING AND MAINTENANCE

6.1 FAULTS AND ALARMS

NOTE!
Refer to the CFW701 quick reference guide and the programming manual for
more information about the errors and alarms.

6.2 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 Loose connection
fluctuates (oscillates)
Defective reference
potentiometer
Oscillation of the
external analog
reference
Incorrect settings
(vector control)
Motor speed too Incorrect settings
high or too low (reference limits)
Control signal
from the analog
reference (if used)
Motor nameplate
Motor does not Settings
reach the rated
speed, or motor
speed starts
oscillating around
the rated speed
(Vector Control)
32 | CFW701
Table 6.1: Solutions for the most frequent problems
Point to be
Verified
1. Check all power and control connections.
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 XC1:15 and 16 and/or XC1:34 and
36 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 P0240.
1. Check if the motor has been properly sized for the
application.
1. Decrease P0180.
2. Check P0410.
Corrective Action