Danfoss VLT AQUA Drive FC 202 Operating Manual page 60

Maintenance, Diagnostics, a...
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
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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VLT
7 7
X44/10, but STO is not enabled.
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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 Digital
Input), 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 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 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
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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.
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PTC Thermistor Card
PTC Thermistor Card MCB 112 enables
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PTC Thermistor Card MCB 112. The
Danfoss A/S © 11/2016 All rights reserved.
®
VLT AQUA Drive FC 202
Troubleshooting
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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.
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.
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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
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
Rotor is blocked.
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 tracking error band in
parameter 4-35 Tracking Error and
parameter 4-37 Tracking Error Ramping.
To apply the change, enable option layout
changes in parameter 14-89 Option Detection.
Alternatively, restore the correct option configu-
ration.
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Encoder Input MCB 102 or VLT
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MG21A402