Danfoss VLT HVAC Operating Instructions Manual page 125

®
VLT HVAC Drive Operating Instructions
WARNING/ALARM 13
Over Current:
The inverter peak current limit (approx. 200%
of the rated current) is exceeded. The warning
will last approx. 8-12 sec., then the frequency
converter trips and issues an alarm. Turn off
the frequency converter and check if the mo-
tor shaft can be turned and if the motor size
matches the frequency converter.
ALARM 14
Earth fault:
There is a discharge from the output phases
to earth, either in the cable between the fre-
quency converter and the motor or in the
motor itself.
Turn off the frequency converter and remove
the earth fault.
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 until it trips, 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
frequency converter still works, but without
the brake function. Turn off the frequency
converter and replace the brake resistor (see
par. 2-15
OFF
.
Stop Trip
and , a warning
Control word Timeout Time
Brake Check
.
MG.11.A4.02 - 09.10.06. VLT ® is a registered Danfoss trademark
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 frequency converter and remove
the brake resistor.
Warning: There is a risk of sub-
stantial power being transmit-
ted to the brake resistor if the
brake transistor is short-circuit-
ed.
ALARM/WARNING 28
Brake check 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
could
cut-out temperature of the heat-sink is 95
o C +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 o C.
The fault could be:
- Ambient temperature too high
- Too long motor cable
ALARM 30
Motor phase U missing:
Motor phase U between the frequency con-
verter and the the motor is missing.
7. Troubleshooting
Trip
[2] has
7
125