Danfoss VLT HVAC Drive FC100 Service Manual Download Page 73

Page: 73 / 192

2-00 DC Hold/Preheat Current

at 5% and

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
Loss of the 24V DC signal on terminal 37 has caused the
filter to trip. To resume normal operation, apply 24V DC to
terminal 37 and reset the filter.

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 frequency converter configuration
The control card and power card are incompatible. Contact
your supplier with the type code of the unit from the
nameplate and the part numbers of the cards to check
compatibility.

WARNING/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 this happens, a reset signal is sent (via
serial communication, digital I/O, or by pressing reset
button on LCP). Note that if automatic restart is enabled,
the motor may start when the fault is cleared.

ALARM 72, Dangerous failure
Safe stop with trip lock. Unexpected signal levels on safe
stop and digital input from the MCB 112 PTC thermistor
card.

WARNING 73, Safe stop auto restart
Safe stopped. Note that with automatic restart enabled,
the motor may start when the fault is cleared.

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.

77 WARNING, 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

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, Initialisation to Default Value
Parameter settings are initialised to default setting after a
manual (three-finger) reset.

ALARM 81, CSIV corrupt
CSIV file has syntax errors.

ALARM 82, CSIV parameter error
CSIV has failed to record a parameter.

ALARM 91, Analog input 54 wrong settings
Switch S202 has to be set in position OFF (voltage input)
when a KTY sensor is connected to analog 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.