Minimum signal amplitude value not reached
The error is triggered by the pick-up monitoring module if the amplitude of the rotary encoder tracking signals (sin/cos signals) is smaller than the limit value given in parameter ID284 "G-Mon.minValue[Ax]. Monitoring is activated by bit 0 in the parameter ID280 "G-Mon.Command Ax" and can trigger a fatal error if bit 0 is set in the parameter ID282 "G-Mon.error_mask".
The limit value ID284 is set automatically if bit 1 is activate in parameter ID280 "G-Mon.Command Ax".
If the sin/cos signals are too small this can lead to an incorrect actual position. In this case, rotation in positional synchronism is no longer possible. In the case of synchronous motors, malcommutation also results.
The amplitude of the sin/cos signals is measured by calculating the measured value "m” as follows:
m = sin^2 + cos^2.
The measured value “m” is displayed in parameter ID2362 "G-Mon measured value". For ideal sin/cos signals the measured value must always be constant, for real signals the measured value should lie within certain limits.
The error response time can be parameterised in parameter ID2366 "G-Ue response time". The higher the response time, the more robust the monitoring is against malfunctions, however the longer the switch-off time too in case of errors.
The error is fatal and leads to immediate shutoff of the drive controller. In this case the drive coasts to a standstill. Renewed release of the drive by the controller is prevented until the cause of the error has been corrected and the error has been acknowledged.
Source and Remedy
Strong interfering signals can lead to the amplitude of the sin/cos signals being too small at times. Check the shielding of the rotary encoder lead.
The error is triggered if the sin/cos signals of the rotary encoder are missing. This can be caused by e.g. disconnected or loose rotary encoder connectors, cable breakage or a loose contact. Check the rotary encoder lead and replace if necessary.
A loose rotary encoder cable can lead to loose contacts. The rotary encoder tracking signals are then temporarily too small and the error can be triggered. Check the screw fitting of the rotary encoder cable.
Rotary encoder defective. Replace rotary encoder.
Rotary encoder input of the rotary encoder evaluation (hardware) in the M drive is defective. Replace M Drive.