Danfoss VLT FC 322 Instruction Manual page 67

Basic Troubleshooting VLT® Automation VT Drive FC 322 D-Frame Instruction Manual
Symptom Possible Cause
Service switch open or missing
motor connection
No mains power with 24 V DC
option card
LCP Stop
Missing start signal (Standby)
Motor not running
Motor coast signal active
(Coasting)
Wrong reference signal source
Motor rotation limit
9 9
Active reversing signal
Motor running in wrong
direction
Wrong motor phase connection
Frequency limits set wrong
Motor is not reaching
Reference input signal not scaled
maximum speed
correctly
Possible incorrect parameter
settings
Motor speed unstable
Possible over-magnetization
Motor runs rough
Possible incorrect settings in the
Motor will not brake brake parameters. Possible too
short ramp down times.
9-2 MG21E122 - VLT® is a registered Danfoss trademark
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Test Solution
Check if the motor is connected Connect the motor and check the
and the connection is not service switch.
interrupted (by a service switch or
other device).
If the display is functioning but no Apply mains power to run the unit.
output, check that mains power is
applied to the frequency converter.
Check if [Off] has been pressed. Press [Auto On] or [Hand On]
(depending on operation mode) to
run the motor.
Check 5-10 Terminal 18 Digital Input Apply a valid start signal to start
for correct setting for terminal 18 the motor.
(use default setting).
Check 5-12 Coast inv. for correct Apply 24 V on terminal 27 or
setting for terminal 27 (use default program this terminal to No
setting). operation.
Check reference signal: Local, Program correct settings. Check
remote or bus reference? Preset 3-13 Reference Site. Set preset
reference active? Terminal reference active in parameter
connection correct? Scaling of group 3-1* References. Check for
terminals correct? Reference signal correct wiring. Check scaling of
available? terminals. Check reference signal.
Check that 4-10 Motor Speed Program correct settings.
Direction is programmed correctly.
Check if a reversing command is Deactivate reversing signal.
programmed for the terminal in
parameter group 5-1* Digital inputs.
See 2.4.5 Motor Rotation Check in
this manual.
Check output limits in 4-13 Motor Program correct limits.
Speed High Limit [RPM], 4-14 Motor
Speed High Limit [Hz] and 4-19 Max
Output Frequency
Check reference input signal Program correct settings.
scaling in 6-* Analog I/O mode and
parameter group 3-1* References.
Reference limits in parameter
group 3-0*.
Check the settings of all motor Check settings in parameter group
parameters, including all motor 1-6* Analog I/O mode. For closed
compensation settings. For closed loop operation, check settings in
loop operation, check PID settings. parameter group 20-0* Feedback.
Check for incorrect motor settings Check motor settings in parameter
in all motor parameters. groups 1-2* Motor data, 1-3* Adv
motor data, and 1-5* Load indep.
setting.
Check brake parameters. Check Check parameter group 2-0* DC
ramp time settings. brake and 3-0* Reference limits.