Docu-No.: 1090020601-EN Rev. 1.2.1 Page 89
Troubleshooting 10
Stepper drive problems and solutions 10.6
10.6.1 Stepper alarm LED flash sequence
Notes:
• All alarms remain latched until the alarm is no longer present and
the alarm has been cleared by the serial master. Alarms 1, 2, 4, 6,
7, 8, 9 are cleared by the Alarm Clear message from the KCM CPU.
Alarm 5 is cleared only by the Stop command from the KCM CPU.
• Only Over Temperature (2), Serial Master Time-out (4) and Safety
Switch Open (5) alarms will cause the Stepper drive to stop the
motor. For all other alarms, the drive will try to run the motor.
• Blink sequence <9> is not used for stepper drives 0000001430 and
0000004568.
Alarm Description Number of
Blinks
EEPROM failure • Invalid EEPROM data detected upon power-up 1
Over temperature • Motor Drive IC indicates a thermal warning.
Temperature at motor driver chips is > 145
C.
Clear fault and re-start drive.
2
Reserved • 3
Serial master time-out. • No valid messages from the KCM CPU in 10
seconds.
4
Safety switch open • Open safety switch result in a feeder stoppage
or the start command to be ignored.
5
Zero speed failure • Motor is being driven by the Stepper but no
encoder pulses are being read.
6
Encoder failure • Two channel encoder operation is selected SW1
DIP position 4 = <1>. and the motor is being
driven by the motor drive. No encoder pulses
received for channel A or B.
7
Motor rotation failure • Motor is being driven by the Stepper but the
encoder detects either a jammed motor or
reverse rotation.
8
High temperature • Temperature at drive is above 70 degrees C. 9
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