Permanent Alarm Indication

If the red LED is permanently lit on the motor:

• The red LED lights permanently when the motor loses steps and can no longer recover
• An error may occur due to insufficient power available to drive the motor
• The pulse rate may exceed the maximum that the motor can process

In these cases, repowering the motor will clear the alarm.

If the red LED remains on permanently and repowering the motor does not clear the alarm:

• Check that the motor enable is receiving the enable signal from MASSO
• Use a multimeter to check the voltage between the negative of the motor and the EN input of the motor
• You should measure 5V to 24V

If this voltage is not present, there may be a broken wire.

The only requirement to clear the alarm LED on power-up is that the enable signal is present.

Alarm on MASSO but No Motor Alarm Indication

If you receive a motor alarm but the motor does not show an alarm indication:

• Check the motor alarm input in the MASSO F1 settings screen
• The motor alarm input should show Low when there is no alarm indication on the motor
• The motor alarm input must not be inverted

If there is no alarm LED on the motor but the alarm input shows High:

• Check the AL wire between the motor and the MASSO input
• This input is fail-safe, so if there is a break in the wire, the alarm input will go High

If this is a new installation:

• Ensure the 10K resistor is installed
• Ensure the motor power supply negative rail is connected to the negative of the MASSO power supply

Flashing Alarm LED Indications

• Ensure all wiring is secure and correctly connected
• Check the speed and acceleration settings
  If the speed is too high or the acceleration time is too short, it may cause an alarm
  Reduce the speed and adjust the acceleration appropriately
• Check the machine for binding on the affected axis, as this can cause the motor to stall and alarm

If the motor moves during power-up, it may cause an alarm condition. In this case, the red alarm light will flash five times at 0.8 second intervals and then repeat after 2 seconds.

If this occurs, the motor must be repowered to resume normal operation by turning the machine off and back on, or by power cycling the motor separately.

Cycling the Estop in this situation may cause the motor to rotate and alarm again. Only power cycling the motor will clear the alarm once in this state.

This is most likely to occur when the motor is used on the Z axis and the axis drops during the power-up sequence.

It is recommended that the Estop button is released before powering up the machine.

If none of the above steps resolve the motor alarm problem:

• Replace the motor with the same model and perform an exclusion test

This can be done by swapping the motor with another motor of the same type on the machine:

• If the fault stays on the same axis, the issue is mechanical
• If the fault moves to the new axis, the motor is faulty