Danfoss VLT FC 102 Operating Manual page 83

VLT HVAC Drive FC 102
Operating Guide
Symptom Possible cause
Motor coast signal active
(Coasting)
Wrong reference signal
source.
AIC not running
Motor running in Motor rotation limit.
wrong direction.
Active reversing signal.
Wrong motor phase connec-
tion.
Motor does not Frequency limits are set
reach maximum wrong.
speed.
Reference input signal not
scaled correctly.
Motor speed un- Possible incorrect parameter
stable. settings.
Motor runs rough. Possible overmagnetization.
Motor does not Possible incorrect settings in
brake. the brake parameters. Possi-
ble too short ramp-down
times.
Open power fuses Phase-to-phase short.
or circuit breaker
trip
Danfoss A/S © 2023.09
Test
Check parameter 5-12 Coast Inv. for
correct setting for terminal 27 (use
default setting).
Check the reference signal: Local,
remote, or bus reference? Preset
reference active? Terminal connec-
tion correct? Scaling of terminals
correct? Reference signal available?
Check the following for current:
•
Parameter 2-70 AIC L1 Current
• Parameter 2-71 AIC L2 Current
• Parameter 2-72 AIC L3 Current
Check that parameter 4-10 Motor
Speed Direction is programmed cor-
rectly.
Check if a reversing command is
programmed for the terminal in pa-
rameter 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 the reference input signal
scaling in parameter group 6-0* An-
alog I/O Mode and parameter group
3-1* References. Reference limits in
parameter group 3-0* Reference Lim-
its.
Check the settings of all motor pa-
rameters, including all motor com-
pensation settings. For closed-loop
operation, check PID settings.
Check for incorrect motor settings
in all motor parameters.
Check the brake parameters.
Motor or panel has a short phase.
Check motor and panel phase for
shorts.
Diagnostics and Troubleshooting
Solution
Apply 24 V on terminal 27 or pro-
gram this terminal to [0] No opera-
tion.
Program correct settings. Check pa-
rameter 3-13 Reference Site. Set pre-
set reference active in parameter
group 3-1* References. Check for cor-
rect wiring. Check scaling of termi-
nals. Check reference signal.
Troubleshoot the AIC (Active In-
Converter).
Program correct settings.
Deactivate reversing signal.
See 5.3.7 Checking Motor Rotation
Program correct limits.
Program correct settings.
Check settings in parameter group
1-6* Load Depend. Setting. For
closed-loop operation, check set-
tings in parameter group 20-0* Feed-
back.
Check motor settings in parameter
groups 1-2* Motor Data, 1-3* Adv Mo-
tor Data, and 1-5* Load Indep. Set-
ting.
Check parameter groups 2-0* DC
Brake and 3-0* Reference Limits.
Eliminate any short circuits detec-
ted.
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