Danfoss VLT Series Design Manual page 157

®
VLT HVAC Drive Design Guide
ALARM 15
In-complete hardware:
A fitted option is not handled by the present
control board (hardware or software).
ALARM 16
Short-circuit:
There is short-circuiting in the motor or on the
motor terminals.
Turn off the frequency converter and remove
the short-circuit.
WARNING/ALARM 17
Control word timeout:
There is no communication to the frequency
converter.
The warning will only be active when par. 8-04
is NOT set to
If par. 8-04 is set to
appears and the frequency converter ramps
down to zero speed, while giving an alarm.
Par. 8-03
possibly be increased.
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
ALARM/WARNING 28
Brake check failed:
Brake resistor fault: the brake resistor is not
connected/working.
WARNING/ALARM 29
Drive over temperature:
If the enclosure is IP 20 or IP 21/TYPE 1, the
cut-out temperature of the heat-sink is 95
o
C +5
set, until the temperature of the heatsink is
below 70
The fault could be:
-
-
OFF .
Stop and Trip , a warning
Control Word Timeout Time
Warning: There is a risk of substantial power being transmitted to the brake resistor
if the brake transistor is short-circuited.
o
C. The temperature fault cannot be re-
o
C.
Ambient temperature too high
Too long motor cable
®
MG.11.B2.02 - VLT is a registered Danfoss trademark
frequency converter still works, but without
the brake function. Turn off the frequency
converter and replace the brake resistor (see
Brake Check
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
selected in par. 2-13, the frequency converter
cuts out and issues this alarm, when the dis-
sipated braking power is higher than 100%.
WARNING/ALARM 27
Brake chopper fault:
The brake transistor is monitored during op-
could 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 frequency converter and remove
the brake resistor.
ALARM 30
Motor phase U missing:
Motor phase U between the frequency con-
verter and 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.
8. Troubleshooting
).
Trip
[2] has been
157
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