Troubleshooting
•
Check that the ambient operating temperature is
within the limits.
•
Check for clogged filters.
•
Check the fan operation.
•
Check the control card.
WARNING 66, Heat sink temperature low
The frequency converter is too cold to operate. This
warning is based on the temperature sensor in the IGBT
module. Increase the ambient temperature of the unit.
Also, a trickle amount of current can be supplied to the
frequency converter whenever the motor is stopped by
setting
parameter 2-00 DC Hold/Preheat Current
to 5% and
parameter 1-80 Function at Stop
.
ALARM 67, Option module configuration has changed
One or more options have either been added or removed
since the last power-down. Check that the configuration
change is intentional and reset the unit.
ALARM 68, Safe Stop activated
Safe Torque Off (STO) has been activated. To resume
normal operation, apply 24 V DC to terminal 37, then send
a reset signal (via bus, digital I/O, or by pressing [Reset]).
ALARM 69, Power card temperature
The temperature sensor on the power card is either too
hot or too cold.
Troubleshooting
•
Check that the ambient operating temperature is
within limits.
•
Check for clogged filters.
•
Check fan operation.
•
Check the power card.
ALARM 70, Illegal FC configuration
The control card and power card are incompatible. To
check compatibility, contact the Danfoss supplier with the
type code from the unit nameplate and the part numbers
of the cards.
ALARM 71, PTC 1 safe stop
STO has been activated from the VLT
®
PTC Thermistor Card
MCB 112 (motor too warm). Normal operation can be
resumed when the MCB 112 applies 24 V DC to terminal
37 again (when the motor temperature reaches an
acceptable level), and when the digital input from the MCB
112 is deactivated. When that happens, send a reset signal
(via bus or digital I/O, or press [Reset]).
ALARM 72, Dangerous failure
STO with trip lock. An unexpected combination of STO
commands has occurred:
•
VLT
®
PTC Thermistor Card MCB 112 enables
X44/10, but STO is not enabled.
•
MCB 112 is the only device using STO (specified
through selection
[4] PTC 1 alarm
or
[5] PTC 1
warning
in
parameter 5-19 Terminal 37 Safe Stop
),
STO is activated, and X44/10 is not activated.
WARNING 73, Safe Stop auto restart
STO activated. With automatic restart enabled, the motor
can start when the fault is cleared.
ALARM 74, PTC Thermistor
Alarm related to VLT
®
PTC Thermistor Card MCB 112. The
PTC is not working.
ALARM 75, Illegal profile sel.
Do not write the parameter value while the motor is
running. Stop the motor before writing the MCO profile to
parameter 8-10 Control Word Profile
.
WARNING 77, Reduced power mode
The frequency converter is operating in reduced power
mode (less than the allowed number of inverter sections).
This warning is generated on power cycle when the
frequency converter is set to run with fewer inverters and
remains on.
ALARM 78, Tracking error
The difference between setpoint value and actual value
exceeds the value in
parameter 4-35 Tracking Error
.
Troubleshooting
•
Disable the function or select an alarm/warning
in
parameter 4-34 Tracking Error Function
.
•
Investigate the mechanics around the load and
motor. Check feedback connections from motor
encoder to frequency converter.
•
Select motor feedback function in
parameter 4-30 Motor Feedback Loss Function
.
•
Adjust the tracking error band in
parameter 4-35 Tracking Error
and
parameter 4-37 Tracking Error Ramping
.
ALARM 79, Illegal power section configuration
The scaling card has an incorrect part number or is not
installed. The MK102 connector on the power card could
not be installed.
ALARM 80, Drive initialised to default value
Parameter settings are initialized to default settings after a
manual reset. To clear the alarm, reset the unit.
ALARM 81, CSIV corrupt
CSIV file has syntax errors.
ALARM 82, CSIV parameter error
CSIV failed to initialize a parameter.
ALARM 83, Illegal option combination
The mounted options are incompatible.
ALARM 84, No safety option
The safety option was removed without applying a general
reset. Reconnect the safety option.
Maintenance, Diagnostics, a...
VLT
®
AutomationDrive FC 301/302
30
Danfoss A/S © 05/2018 All rights reserved.
MG33AT02
7
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