Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual page 82

Diagnostics and Troubleshoo...
Symptom
Motor not running
7 7
Motor running in wrong
direction
Motor is not reaching
maximum speed
Motor speed unstable
Motor runs rough
80
®
VLT HVAC Drive FC 102 Low Harmonic Drive
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 overmagnetization
Danfoss A/S © 04/2015 All rights reserved.
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 parameter 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 parameter 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
parameter 4-13 Motor Speed High
Limit [RPM], parameter 4-14 Motor
Speed High Limit [Hz] and
parameter 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 Limits.
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
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
parameter 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 chapter 4.6.1 Motor Cable in
this manual
Program correct limits
Program correct settings
Check settings in parameter group
1-6* Load Depen. Setting. For
closed-loop operation, check
settings in parameter group 20-0*
Feedback.
Check motor settings in parameter
groups 1-2* Motor Data, 1-3* Addl.
Motor Data, and 1-5* Load Indep.
Setting.
MG16I322