Danfoss VLT AQUA High Power Operating Instructions Manual page 141

VLT AQUA High Power Operation Instructions
WARNING 25, Brake resistor short-
circuited:
The brake resistor is monitored during opera-
tion. If it short-circuits, the brake function is
disconnected and the warning appears. The
frequency converter still works, but without
the brake function. Turn off the frequency
converter and replace the brake resistor (see
par. 2-15
ALARM/WARNING 26, Brake resistor
power limit:
The power transmitted to the brake resistor is
calculated as a percentage, as a mean value
over the last 120 s, on the basis of the resist-
ance value of the brake resistor (par. 2-11)
and the intermediate circuit voltage. The
warning is active when the dissipated braking
power is higher than 90%. If
been selected in par. 2-13, the frequency con-
verter cuts out and issues this alarm, when the
dissipated braking power is higher than
100%.
WARNING 27, Brake chopper fault:
The brake transistor is monitored during op-
eration and if it short-circuits, the brake func-
tion disconnects and the warning comes up.
The frequency converter is still able to run, but
since the brake transistor has short-circuited,
substantial power is transmitted to the brake
resistor, even if it is inactive. Turn off the fre-
quency converter and remove the brake re-
sistor.
ALARM/WARNING
failed:
Brake resistor fault: the brake resistor is not
connected/working.
ALARM 29, Frequency converter over
temperature:
If the enclosure is IP 20 or IP 21/TYPE 1, the
cut-out temperature of the heat-sink is 95
+5 o C, dependent on size of frequency con-
verter. The temperature fault cannot be reset,
until the temperature of the heatsink is below
70 o C +5
The fault could be:
-
-
Brake Check
.
Trip
Warning: There is a risk of sub-
stantial power being transmit-
ted to the brake resistor if the
brake transistor is short-circuit-
ed.
28, Brake
o C.
Ambient temperature too high
Too long motor cable
®
MG.20.P1.02 - VLT is a registered Danfoss trademark
ALARM 30, Motor phase U missing:
Motor phase U between the frequency con-
verter and the the motor is missing.
Turn off the frequency converter and check
motor phase U.
ALARM 31, Motor phase V missing:
Motor phase V between the frequency con-
verter and the motor is missing.
Turn off the frequency converter and check
motor phase V.
ALARM 32, Motor phase W missing:
Motor phase W between the frequency con-
verter and the motor is missing.
Turn off the frequency converter and check
motor phase W.
ALARM 33, Inrush fault:
Too many power-ups have occurred within a
[2] has
short time period. See the chapter
tions
for the allowed number of powerups
within one minute.
WARNING/ALARM 34, Fieldbus commu-
nication fault:
The fieldbus on the communication option
card is not working.
WARNING 35, Out of frequency range:
This warning is active if the output frequency
has reached its
Warning speed high
or
quency converter is in
loop
(par. 1-00), the warning is active in the
display. If the frequency converter is not in
this mode bit 008000 Out of
in extended status word is active but there is
no warning in the display.
ALARM 38, Internal fault:
Contact the local Danfoss supplier.
WARNING 47, 24 V supply low:
The external 24 V DC backup power supply
check
may be overloaded, otherwise contact the lo-
cal Danfoss supplier.
WARNING 48, 1.8 V supply low:
Contact the local Danfoss supplier.
ALARM 50, AMA calibration failed:
Contact the local Danfoss supplier.
o
C
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.
6. Troubleshooting
Specifica-
Warning speed low (par. 4-52)
(par. 4-53). If the fre-
Process control, closed
frequency range
6
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