Danfoss VLT HVAC Drive FC 100 Service Manual page 75

4 Troubleshooting
ALARM 70, Illegal FC Configuration
The current control board and power board combination is illegal.
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 deac-
tivated. 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.
4
ALARM 72, Dangerous failure
Safe stop with trip lock. Unexpected signal levels on the 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.
ALARM 79, Illegal power section config-
uration
The scaling card is the incorrect part number or not installed. Also, the MK102 connector on the
power card is not installed.
ALARM 80, Drive initialized to default value
Parameter settings are initialized to default settings after a manual reset.
WARNING 81, CSIV corrupt
CSIV file has syntax errors.
WARNING 82, CSIV parameter error
CSIV has failed to record a parameter.
ALARM 91, Analog input 54 wrong settings
Switch S202 must be set in the position OFF (voltage input) when a KTY sensor is connected to
analog input terminal 54.
ALARM 92, No flow
A no-load situation has been detected in the system. See parameter group 22-2*.
ALARM 93, Dry pump
A no-flow situation and high speed indicate that the pump has run dry. See parameter group
22-2*.
ALARM 94, End of curve
Feedback stays lower than the setpoint which may indicate leakage in the pipe system. See pa-
rameter group 22-5*.
ALARM 95, Broken belt
Torque is below the torque level set for no load, indicating a broken belt. See parameter group
22-6*.
ALARM 96, Start delayed
Motor start has been delayed due to short-cycle protection active. See parameter group 22-7*.
WARNING 97, Stop delayed
Stopping the motor has been delayed due to short cycle protection is active. See parameter group
22-7*.
WARNING 98, Clock fault
Clock Fault. The time is not set or the RTC clock (if mounted) has failed. See parameter group
0-7*.
4-18
High Power Service Manual for VLT
MG.90.L1.22 - VLT ® is a registered Danfoss trademark
®
FC Series
Adjustable Frequency Drives