Danfoss VLT CDS 303 User Manual

WARNING/ALARM 8, DC under voltage
If the intermediate circuit voltage (DC link) drops below
the undervoltage limit, the adjustable frequency drive
checks if a 24 V DC backup supply is connected. If no 24 V
DC backup supply is connected, the adjustable frequency
drive trips after a xed time delay. The time delay varies
with unit size.
Troubleshooting
Make sure that the supply voltage matches the
adjustable frequency drive voltage.
Perform input voltage test.
Perform soft charge circuit test.
WARNING/ALARM 9, Inverter overload
The adjustable frequency drive is about to cut out because
of an overload (current too high for too long). The counter
for electronic, thermal inverter protection issues a warning
at 98% and trips at 100%, while giving an alarm. The
adjustable frequency drive cannot be reset until the
counter is below 90%.
The fault is that the adjustable frequency drive has run
with more than 100% overload for too long.
Troubleshooting
Compare the output current shown on the LCP
with the adjustable frequency drive rated current.
Compare the output current shown on the LCP
with measured motor current.
Display the Thermal Drive Load on the LCP and
monitor the value. When running above the
adjustable frequency drive continuous current
rating, the counter increases. When running
below the adjustable frequency drive continuous
current rating, the counter decreases.
WARNING/ALARM 10, Motor overload temperature
According to the electronic thermal protection (ETR), the
motor is too hot. Select whether the adjustable frequency
drive issues a warning or an alarm when the counter
reaches 100% in parameter 1-90 Motor Thermal Protection.
The fault occurs when the motor runs with more than
100% overload for too long.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded
Check that the motor current set in
parameter 1-24 Motor Current is correct.
Ensure that Motor data in parameters 1-20 to
1-25 are set correctly.
If an external fan is in use, check in
parameter 1-91 Motor External Fan that it is
selected.
Running AMA in parameter 1-29 Automatic Motor
Adaptation (AMA) tunes the adjustable frequency
drive to the motor more accurately and reduces
thermal loading.
WARNING/ALARM 11, Motor thermistor over temp
Check whether the thermistor is disconnected. Select
whether the adjustable frequency drive issues a warning or
an alarm in parameter 1-90 Motor Thermal Protection.
Troubleshooting
Check for motor overheating.
Check if the motor is mechanically overloaded.
When using terminal 53 or 54, check that the
thermistor is connected correctly between either
terminal 53 or 54 (analog voltage input) and
terminal 50 (+10 V supply). Also check that the
terminal switch for 53 or 54 is set for voltage.
Check parameter 1-93 Thermistor Source selects
terminal 53 or 54.
When using digital inputs 18 or 19, check that
the thermistor is connected correctly between
either terminal 18 or 19 (digital input PNP only)
and terminal 50. Check parameter 1-93 Thermistor
Source selects terminal 18 or 19.
WARNING/ALARM 12, Torque limit
The torque has exceeded the value in
parameter 4-16 Torque Limit Motor Mode or the value in
parameter 4-17 Torque Limit Generator Mode.
Parameter 14-25 Trip Delay at Torque Limit can change this
from a warning only condition to a warning followed by an
alarm.
Troubleshooting
If the motor torque limit is exceeded during
ramp-up, extend the ramp-up time.
If the generator torque limit is exceeded during
ramp-down, extend the ramp-down time.
If torque limit occurs while running, possibly
increase the torque limit. Make sure that the
system can operate safely at a higher torque.
Check the application for excessive current draw
on the motor.
WARNING/ALARM 13, Over current
The inverter peak current limit (approximately 200% of the
rated current) is exceeded. The warning lasts about 1.5 s,
then the adjustable frequency drive trips and issues an
alarm. This fault can be caused by shock loading or quick
acceleration with high inertia loads. It can also appear after
Troubleshooting
VLT
®
Compressor Drives CDS 302/CDS 303
154 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
77

Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English