The low-volt-power-supply
is defective.
Check the +5V / +12V / -12V DC voltages going to the
Mocon/ Maincon PCB.
The parameter OVER TEMP
NC bit 14 for the axis is
incorrect.
Make sure this parameter bit is set correctly. This is
normally a 1.
Faulty encoder cable or
connection.
Inspect the cables and connectors. Refer to the Main
Processor/Encoder Cable section below.
Alarm 139 - 142 190,
273
MOTOR Z FAULT.
Alarm 153 - 156
Z CHANNEL
MISSING
Alarm 182 - 185, 194,
278
AXIS ENCODER CABLE
FAULT.
Alarm 217, 218, 219
AXIS
PHASE ERROR
Alarm 224 - 228
AXIS
TRANSITION FAULT
Faulty encoder on servo
motor.
Check the motor for coolant contamination. Check the
encoder steps/revolution versus and ball screw pitch
and verify the encoder counts are accurate per each
rotation.
Power Cable
Corrective Action:
Make sure the cables are connected correctly to the corresponding amplifier. Inspect the connector at the motor. Look for
loose connections or contamination.
Look for signs of damage or stiffness on the cable. Disconnect the power cable from the amplifier and motor. Measure the
resistance from leg to leg, and from leg to ground. Make sure the measurements result in an open connection. Check
each leg from one end of the cable to the corresponding leg on the other end of the cable for continuity. If there is an open
connection, there is a problem with the cable.
Sigma 1 - Axis Servo Motor and Cables - Troubleshooting Guide
Page 4 of 7 pages