32 | CFW701
Troubleshooting and Maintenance
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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
Table 6.1:
Solutions for the most frequent problems
Problem
Point to be
Verified
Corrective Action
Motor does not start Incorrect wiring
connection
1. Check all power and control connections.
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 XC1:15 and 16 and/or XC1:34 and
36 are not shorted (short-circuit at the 24 Vdc power
supply).
Motor stall
1. Decrease motor overload.
2. Increase P0136, P0137 (V/f), or P0169/P0170 (vector
control).
Motor speed
fluctuates (oscillates)
Loose connection
1. Stop the inverter, turn off the power supply, and check
and tighten all power connections.
2. Check all internal connections of the inverter.
Defective reference
potentiometer
1. Replace 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 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.
Motor speed too
high or too low
Incorrect settings
(reference limits)
1. Check if the values of P0133 (Minimum Speed) and
P0134 (Maximum Speed) are properly set for the motor
and application used.
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 P0240.
Motor nameplate
1. Check if the motor has been properly sized for 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.
