The ‘Input Fault’ MM Error relates to a fault with the power supply going to the MM The MM verifies
the power supply going to the unit; the mains inputs are sampled to check the DC voltage. The diagram
below illustrates the AC voltage that comes in through the power supply with the detected signal
(digital input).
The MM checks the ON state of the digital signal in the mains input; the ON state of the digital input
should be 50%. This means that the digital input should be in the ON state for a half-wave of the AC
signal. The OFF state is safe. If the MM sees the digital input being ON for more than 75% across a
sample period, then it will get stuck in an unsafe state. This will cause an Input Fault lockout to occur.
If this lockout persists, the mains input should be checked. To troubleshoot this issue, please check for
any DC voltage in the mains voltage and contact your local power supplier.
Page 65 Mk8 MM End User Guide 22.05.2017
4 Errors and Lockouts
4.6.4 Channel Positioning Error
The ‘Channel Positioning’ MM Error is caused by incorrect wiring and incorrect servomotor position. In
addition to checking the wiring, and zeroing the potentiometer, please also check that the
correct voltage is supplied to the servomotors, which should be ±10% of the required voltage, and the
unit is earthed properly. This can cause hunting issues if not at the required voltage or incorrect earthing.
4.6.5 Input
Fault
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