ALARM 63, Mechanical Brake Low:
The actual motor current has not exceeded
the “release brake” current within the “Start
delay” time window.
WARNING 64, Voltage Limit:
The load and speed combinations demand a
motor voltage higher than the actual DC link
voltage.
WARNING/ALARM/TRIP 65, Control
Card Overtemperature:
Control card overtemperature: The cut-out
temperature of the control card is 176° F [80°
C].
WARNING 66, Heatsink Temperature
Low:
The heatsink temperature is measured at 32°
F [0° C]. This may indicate that the tempera-
ture sensor is defective, and thus the fan
speed is increased to the maximum if the pow-
er part or control card is very hot.
ALARM 67, Option Configuration has
Changed:
One or more options has either been added or
removed since the last power-down.
ALARM 68, Safe Stop:
Safe Stop has been activated. To resume nor-
mal operation, apply 24 V DC to T-37, then
send a reset signal (via Bus, Digital I/O, or by
pressing [RESET]).
WARNING 68, Safe Stop:
Safe Stop has been activated. Normal opera-
tion is resumed when safe stop is disabled.
Warning: Automatic Restart!
ALARM 70, Illegal FC Configuration:
Current combination of control board and
power board is illegal.
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 re-
set signal must be is be sent (via Bus, Digital
I/O, or by pressing [RESET]).
WARNING 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. Warning: Automatic Re-
start.
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.
ALARM 80, Drive Initialized to Default
Value:
Parameter settings are initialized to default
setting after a manual (three-finger) reset.
ALARM 90, Encoder loss:
Check the connection to encoder option and
eventually replace the MCB 102 or MCB 103.
ALARM 91, Analog Input 54 Wrong Set-
tings:
Switch S202 has to be set in position OFF
(voltage input) when a KTY sensor is connec-
ted to analog input terminal 54.
ALARM 250, New Spare Part:
The power or Switch Mode Power Supply has
been exchanged. The adjustable frequency
drive type code must be restored in the EE-
PROM. Select the correct type code in Par
14-23 according to the label on unit. Remem-
ber to select ‘Save to EEPROM’ to complete.
ALARM 251, New Type Code:
The adjustable frequency drive has a new
type code.
VLT
®
AutomationDrive FC 300 Instruction
Manual
6. Troubleshooting
MG.33.A9.22 - VLT is a registered Danfoss trademark
95
6
