Danfoss VLT AutomationDrive FC 302 Operating Instructions Manual page 57

Maintenance, Diagnostics an...
Troubleshooting
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Check the settings for warning/alarm/disabling in
parameter 4-30 Motor Feedback Loss Function.
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Set the tolerable error in parameter 4-31 Motor
Feedback Speed Error.
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Set the tolerable feedback loss time in
parameter 4-32 Motor Feedback Loss Timeout.
WARNING 62, Output frequency at maximum limit
The output frequency has reached the value set in
parameter 4-19 Max Output Frequency. Check the
application for possible causes. Possibly increase the
output frequency limit. Be sure that the system can
operate safely at a higher output frequency. The warning
clears when the output drops below the maximum limit.
ALARM 63, Mechanical brake low
The actual motor current has not exceeded the release
brake current within the start delay time window.
ALARM 64, Voltage Limit
The load and speed combination demands a motor
voltage higher than the actual DC-link voltage.
WARNING/ALARM 65, Control card over temperature
The cut-out temperature of the control card is 80 °C.
Troubleshooting
•
Check that the ambient operating temperature is
within the limits.
•
Check for clogged filters.
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Check the fan operation.
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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 at 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
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.
MG34U402
Operating Instructions
Troubleshooting
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ALARM 70, Illegal FC configuration
The control card and power card are incompatible. To
check compatibility, contact the Danfoss supplier with the
type code of the unit from the nameplate and the part
numbers of the cards.
ALARM 71, PTC 1 safe stop
STO has been activated from the VLT
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:
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WARNING 73, Safe Stop auto restart
Safe Torque Off activated. With automatic restart enabled,
the motor can start when the fault is cleared.
ALARM 74, PTC Thermistor
Alarm related to VLT
PTC is not working.
ALARM 75, Illegal profile sel.
Do not write the parameter value while the motor runs.
Stop motor before writing the MCO profile to
parameter 8-10 Control Word Profile.
WARNING 76, Power unit setup
The required number of power units does not match the
detected number of active power units.
Troubleshooting
When replacing an F-frame module, this warning occurs, if
the power-specific data in the module power card does
not match the rest of the frequency converter. Confirm
that the spare part and its power card are the correct part
number.
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
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Check that the ambient operating temperature is
within limits.
Check for clogged filters.
Check fan operation.
Check the power card.
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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.
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PTC Thermistor Card MCB 112. The
PTC Thermistor Card
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