Danfoss VLT AutomationDrive FC 302, Programming Manual, Page: 339 / 346

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 76, Power unit setup
The required number of power units do not match the
detected number of active power units.
This warning occurs when replacing a module for an F-size
enclosure if the power-specific data in the module power
card does not match the rest of the frequency converter.
Troubleshooting
•
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
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 drive.
•
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 initialized
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.
ALARM 88, Option detection
A change in the option layout is detected.
Parameter 14-89 Option Detection is set to [0] Frozen config-
uration and the option layout has been changed.
•
To apply the change, enable option layout
changes in
parameter 14-89 Option Detection .
•
Alternatively, restore the correct option configu-
ration.
WARNING 89, Mechanical brake sliding
The hoist brake monitor detects a motor speed exceeding
10 RPM.
ALARM 90, Feedback monitor
Check the connection to encoder/resolver option and, if
necessary, replace VLT
®
Encoder Input MCB 102 or VLT
®
Resolver Input MCB 103.
ALARM 91, Analog input 54 wrong settings
Set switch S202 in position OFF (voltage input) when a
KTY sensor is connected to analog input terminal 54.
ALARM 99, Locked rotor
The rotor is blocked.
WARNING/ALARM 101, Speed monitor
The motor speed monitor value is out of range. See
parameter 4-43 Motor Speed Monitor Function .
WARNING/ALARM 104, Mixing fan fault
The fan is not operating. The fan monitor checks that the
fan is spinning at power-up or whenever the mixing fan is
turned on. The mixing-fan fault can be configured as a
warning or an alarm trip in
parameter 14-53 Fan Monitor .
Troubleshooting Programming Guide
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