January 2012 6.18 Spindles 1009
6.18.3 Spindle in speed control
Speed encoder of
the spindle
The parameter object
CfgServoMotoris not required for:
• Virtual axes (MP_axisMode = Virtual)
• Axes that are for display only (MP_axisMode = Display)
• Analog axes (MP_axisHw =Analog)
CfgEncoderMonitor is not required for:
• Virtual axes (MP_axisMode = Virtual)
Digital speed control requires a speed encoder.
The MANUALplus 620 monitors the reference mark of the speed encoder.
The monitor checks whether the line count for one revolution from reference
mark to reference mark is equal to the line-count entry in the motor table.
If differences occur, the DSP error message C3A0 Incorrect reference
position S appears. If this happens, check the speed encoder, encoder cable,
and whether you have selected the correct motor.
With a gear wheel encoder, even if it is properly installed, monitoring can
result in this error message due to its inherent inaccuracy:
In this case, switch the monitoring off with
MP_motEncCheckOff – Bit 0 = 1
The MANUALplus 620 monitors the direction of rotation. If the nominal value
of current exceeds the limit value for a certain time, the DSP error message
C380 motor <spindle n, axis> not controllable appears.
At lower speeds, high-frequency spindles only have a low amount of torque.
If such a spindle is having its speed controlled, the tool changer may slightly
twist the spindle, causing the limit of current to be exceeded. This leads to the
above error message:
In this case, switch the monitoring off with
MP_motEncCheckOff – Bit 1 = 1
Settings in the configuration editor MP number
Axes
ParameterSets
[Key name of the parameter set]
CfgServoMotor
motEncCheckOff – Bit0, 1
CfgEncoderMonitor
checkRefDistance
401303
400704
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