Danfoss VLT HVAC Drive Instruction Manual page 135

VLT ® HVAC Drive Instruction Manual
motor is overloaded by more than 100% for
too long. Check that the motor par. 1-24 is set
correctly.
WARNING/ALARM 11
Motor thermistor overtemp.:
The thermistor or the thermistor connection is
disconnected. Decide whether the adjustable
frequency drive is to give a warning or an
alarm when the counter reaches 100% in par.
1-90. Make sure the thermistor is connected
correctly between terminal 53 or 54 (analog
voltage input) and terminal 50 (+10 V supply),
or between terminal 18 or 19 (digital input
PNP only) and terminal 50. If a KTY sensor is
used, check for correct connection between
terminal 54 and 55.
WARNING/ALARM 12
Torque limit:
The torque is higher than the value in par.
4-16 (in motor operation), or the torque is
higher than the value in par. 4-17 (in regen-
erative operation).
WARNING/ALARM 13
Overcurrent:
The inverter peak current limit (approximately
200% of the rated current) is exceeded. The
warning will last approximately 8-12 sec., then
the adjustable frequency drive trips and issues
an alarm. Turn off the adjustable frequency
drive and check if the motor shaft can be
turned and if the motor size matches the ad-
justable frequency drive.
ALARM 14
Ground fault:
There is a discharge from the output phases
to ground, either in the cable between the ad-
justable frequency drive and the motor or in
the motor itself.
Turn off the adjustable frequency drive and
remove the ground fault.
ALARM 15
Incomplete hardware:
A fitted option is not handled by the present
control board (hardware or software).
MG.11.A4.22 - VLT ® is a registered Danfoss trademark
ALARM 16
Short-circuit:
There is a short-circuit in the motor or on the
motor terminals.
Turn off the adjustable frequency drive and
remove the short-circuit.
WARNING/ALARM 17
Control word timeout:
There is no communication to the adjustable
frequency drive.
The warning will only be active when par. 8-04
OFF
is NOT set to .
Stop
If par. 8-04 is set to and
appears and the adjustable frequency drive
ramps down until it trips, while giving an
alarm.
par. 8-03 Control word Timeout Time
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
adjustable frequency drive still works, but
without the brake function. Turn off the ad-
justable frequency drive and replace the brake
Brake Check
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
energy is higher than 90%. If
been selected in par. 2-13, the adjustable fre-
quency drive cuts out and issues this alarm
when the dissipated braking energy 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 is issued.
The adjustable frequency drive is still able to
run, but since the brake transistor has short-
7. Troubleshooting
Trip
, a warning
could
7
.
)
Trip
[2] has
135