Danfoss VLT AQUA Drive FC 202 Instruction Manual page 68

Basic Troubleshooting
Symptom
Motor not running
9 9
Motor running in wrong
direction
Motor is not reaching
maximum speed.
Motor speed unstable
Motor runs rough
Motor will not brake.
9-2
®
VLT AQUA Drive
Instruction Manual
Possible cause
Service switch open or missing
motor connection
No line power with 24 V DC
option card
LCP Stop
Missing start signal (Standby)
Motor coast signal active
(Coasting)
Wrong reference signal source
Motor rotation limit
Active reversing signal
Wrong motor phase connection
Frequency limits set wrong.
Reference input signal not scaled
correctly
Possible incorrect parameter
settings
Possible over-magnetization
Possible incorrect settings in the
brake parameters. Possible too
short ramp down times.
®
MG20M922 - VLT
Test
Check if the motor is connected
and the connection is not
interrupted (by a service switch or
other device).
If the display is functioning but no
output, check that line power is
applied to the adjustable frequency
drive.
Check if [Off] has been pressed.
Check 5-10 Terminal 18 Digital Input
for correct setting for terminal 18
(use default setting)
Check 5-12 Coast inv. for correct
setting for terminal 27 (use default
setting).
Check reference signal: Local,
remote or bus reference? Preset
reference active? Terminal
connection correct? Scaling of
terminals correct? Reference signal
available?
Check that 4-10 Motor Speed
Direction is programmed correctly.
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs.
Check output limits in 4-13 Motor
Speed High Limit [RPM], 4-14 Motor
Speed High Limit [Hz] and 4-19 Max
Output Frequency.
Check reference input signal
scaling in 6-0* Analog I/O Mode and
parameter group 3-1* References.
Reference limits in parameter
group 3-0* Reference Limit.
Check the settings of all motor
parameters, including all motor
compensation settings. For closed-
loop operation, check PID settings.
Check for incorrect motor settings
in all motor parameters.
Check brake parameters. Check
ramp time settings.
is a registered Danfoss trademark
Solution
Connect the motor and check the
service switch.
Apply line power to run the unit.
Press [Auto On] or [Hand On]
(depending on operation mode) to
run the motor.
Apply a valid start signal to start
the motor.
Apply 24 V on terminal 27 or
program this terminal to No
operation.
Program correct settings. Check
3-13 Reference Site. Set preset
reference active in parameter
group 3-1* References. Check for
correct wiring. Check scaling of
terminals. Check reference signal.
Program correct settings.
Deactivate reversing signal.
See in this manual.
Program correct limits.
Program correct settings.
Check settings in parameter group
1-6* Analog I/O mode. For closed-
loop operation, check settings in
parameter group 20-0* Feedback.
Check motor settings in parameter
groups 1-2* Motor Data, 1-3* Adv
Motor Data, and 1-5* Load Indep.
Setting.
Check parameter group 2-0* DC
Brake and 3-0* Reference Limits.