5 Troubleshooting
5.1 Acoustic Noise or Vibration
If the compressor is making noise or vibrations at certain frequencies, set the speed bypass parameters in
parameter 4-6* Speed Bypass
.
5.2 List of Warnings and Alarms
Table 18: Warnings and Alarms
Fault
num‐
ber
Alarm/
warning
bit num‐
ber
Fault text
Warn‐
ing
Alarm
Trip
lock
Cause of problem
2
16
Live zero error
X
X
–
Signal on terminal 53 or 54 is less than 50% of the value
set in
parameter 6-10 Terminal 53 Low Voltage
,
parameter
6-12 Terminal 53 Low Current
,
parameter 6-20 Terminal 54
Low Voltage
, or
parameter 6-22 Terminal 54 Low Current
.
See also
parameter group 6-0* Analog I/O Mode
.
3
No motor
–
X
–
The motor is not connected properly to the drive.
4
14
Mains ph. loss
X
X
X
Missing phase on the supply side or too high voltage im-
balance. Check the supply voltage. See
parameter 14-12
Function at Mains Imbalance
.
7
11
DC over volt
X
X
–
DC-link voltage exceeds the limit.
8
10
DC under volt
X
X
–
DC-link voltage drops below voltage warning low-limit.
9
9
Inverter over-
load
X
X
–
More than 100% load for a long time.
10
8
Motor ETR over
X
X
–
For 6.0–10 kW (8.0–15 hp) drives: The motor is too hot
due to more than 100% load for a long time. See
parame-
ter 1-90 Motor Thermal Protection
.For 18.5–30 kW (22–
40 hp) drives:
Parameter 1-90 Motor Thermal Protection
is
disabled.
Alarm 10
is used for compressor overload.
11
7
Motor th over
X
X
–
Thermistor or thermistor connection is disconnected. See
parameter 1-90 Motor Thermal Protection
.
13
5
Over Current
X
X
X
Inverter peak current limit is exceeded.
14
2
Earth Fault
–
X
X
Discharge from output phases to ground.
16
12
Short Circuit
–
X
X
Short circuit in motor or on motor terminals.
17
4
Ctrl. word TO
X
X
–
No communication to drive. See
parameter group 8-0*
General Settings
.
24
50
Fan Fault
X
X
–
The heat sink cooling fan is not working (only on 400 V,
30 kW (40 hp) units).
30
19
U phase loss
–
X
X
Motor phase U is missing. Check the phase.
31
20
V phase loss
–
X
X
Motor phase V is missing. Check the phase.
32
21
W phase loss
–
X
X
Motor phase W is missing. Check the phase.
38
17
Internal fault
–
X
X
Contact the local Danfoss supplier.
Troubleshooting
Operating Guide | VLT® Compressor Drive CDS 803
AQ321748767627en-000101 / 130R0570
40 | Danfoss A/S © 2019.12