Danfoss VLT AQUA Drive Design Manual page 160

8. Troubleshooting
ALARM/WARNING 28
Brake check failed:
Brake resistor fault: the brake resistor is not
connected/working.
WARNING/ALARM 29
Drive overtemperature:
If the enclosure is IP 20 or IP 21/TYPE 1, the
cut-out temperature of the heat-sink is 203
+10
cannot be reset until the temperature of the
heatsink is below 158
The fault could be a result of:
-
-
8
ALARM 30
Motor phase U missing:
Motor phase U between the adjustable fre-
quency drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase U.
ALARM 31
Motor phase V missing:
Motor phase V between the adjustable fre-
quency drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase V.
ALARM 32
Motor phase W missing:
Motor phase W between the adjustable fre-
quency drive and the motor is missing.
Turn off the adjustable frequency drive and
check motor phase W.
ALARM 33
Soft-charge fault:
Too many powerups have occurred within a
short period of time. See the chapter
Specifications
er-ups within one minute.
160
Warning: There is a risk of substantial power being transmitted to the brake resistor
if the brake transistor is short-circuited.
o o o
F [95 C +5 C]. The temperature fault
o o
F [70 C].
Ambient temperature too high
Motor cable too long
for the allowed number of pow-
MG.20.N2.22 - VLT
WARNING/ALARM 34
Ser. com. bus fault:
The serial communication bus on the commu-
nication option card is not working.
ALARM 38
Internal fault:
Contact your local Danfoss supplier.
o
F
WARNING 47
24 V supply low:
The external 24 V DC backup power supply
may be overloaded, otherwise contact your
Danfoss supplier.
ALARM 48
1.8 V supply low:
Contact your Danfoss supplier.
WARNING 49
Speed limit:
The speed has been limited by range in par.
4-11 and par. 4-13.
ALARM 50
AMA calibration failed:
Contact your Danfoss supplier.
ALARM 51
AMA check Unom and Inom:
The setting of motor voltage, motor current
and motor power is presumably wrong. Check
the settings.
ALARM 52
AMA low Inom:
The motor current is too low. Check the set-
tings.
ALARM 53
AMA motor too big:
General
The motor is too big for the AMA to be carried
out.
® is a registered Danfoss trademark.
VLT ® AQUA Drive Design Guide