Danfoss VLT AutomationDrive FC 300 Programming Manual page 214

Troubleshooting
ALARM 71, PTC 1 safe stop
Safe Stop has been activated from the MCB 112 PTC
Thermistor Card (motor too warm). Normal operation can be
resumed when the MCB 112 applies 24 V DC to T-37 again
(when the motor temperature reaches an acceptable level)
and when the Digital Input from the MCB 112 is deactivated.
When that happens, a reset signal must be is be sent (via Bus,
Digital I/O, or by pressing [RESET]).
ALARM 72, Dangerous failure
Safe Stop with Trip Lock. The Dangerous Failure Alarm is
issued if the combination of safe stop commands is
unexpected. This is the case if the MCB 112 VLT PTC
Thermistor Card enables X44/10 but safe stop is somehow
not enabled. Furthermore, if the MCB 112 is the only device
using safe stop (specified through selection [4] or [5] in
5-19 Terminal 37 Safe Stop), an unexpected combination is
activation of safe stop without the X44/10 being activated.
The following table summarizes the unexpected
combinations that lead to Alarm 72. Note that if X44/10 is
activated in selection 2 or 3, this signal is ignored! However,
the MCB 112 will still be able to activate Safe Stop.
WARNING 73, Safe stop auto restart
Safe stopped. Note that with automatic restart enabled, the
motor may start when the fault is cleared.
ALARM 74, PTC Thermistor
Alarm related to the ATEX option. The PTC is not working.
ALARM 75, Illegal profile sel.
Parameter value must not be written while motor is running.
Stop motor before writing MCO profile to 8-10 Control Word
Profile for instance.
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 will occur if the
power specific data in the module power card does not
match the rest of the frequency converter. Please confirm
the spare part and its power card are the correct part
number.
WARNING 77, Reduced power mode
This warning indicates that the frequency converter is
operating in reduced power mode (i.e. less than the allowed
number of inverter sections). This warning will be generated
on power cycle when the frequency converter is set to run
with fewer inverters and will remain on.
ALARM 78, Tracking error
The difference between set point value and actual value has
exceeded the value in 4-35 Tracking Error. Disable the
function by 4-34 Tracking Error Function or select an alarm/
warning also in 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 4-30 Motor Feedback Loss
Function. Adjust tracking error band in 4-35 Tracking Error
and 4-37 Tracking Error Ramping.
FC 300 Programming Guide
ALARM 79, Illegal power section configuration
The scaling card is the incorrect part number or not installed.
Also MK102 connector on the power card could not be
installed.
ALARM 80, Drive initialised to default value
Parameter settings are initialised to default settings after a
manual reset. Reset the unit to clear the alarm.
ALARM 81, CSIV corrupt
CSIV file has syntax errors.
ALARM 82, CSIV parameter error
CSIV failed to init a parameter.
ALARM 83, Illegal option combination
The mounted options are not supported to work together.
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 has been detected. This alarm
occurs when 14-89 Option Detection is set to [0] Frozen config-
uration and the option layout for some reason has changed.
An option layout change has to be enabled in 14-89 Option
Detection before the change is accepted. If the change of
configuration is not accepted, it is only possible to reset
Alarm 88 (Trip-lock) when the option configuration has been
re-established/corrected.
WARNING 89, Mechanical brake sliding
The hoist brake monitor has detected a motor speed >
10rpm.
ALARM 90, Feedback monitor
Check the connection to encoder/ resolver option and
eventually replace the MCB 102 or MCB 103.
ALARM 91, Analogue input 54 wrong settings
Switch S202 has to be set in position OFF (voltage input)
when a KTY sensor is connected to analogue input terminal
54.
ALARM 92, No flow
A no-flow condition has been detected in the system.
22-23 No-Flow Function is set for alarm. Troubleshoot the
system and reset the frequency converter after the fault has
been cleared.
ALARM 93, Dry pump
A no-flow condition in the system with the frequency
converter operating at high speed may indicate a dry pump.
22-26 Dry Pump Function is set for alarm. Troubleshoot the
system and reset the frequency converter after the fault has
been cleared.
ALARM 94, End of curve
Feedback is lower than the set point. This may indicate
leakage in the system. 22-50 End of Curve Function is set for
alarm. Troubleshoot the system and reset the frequency
converter after the fault has been cleared.
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
5 5
213