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ProNet Plus Series AC Servo User's Manual
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4.7.3 Adjusting the Reference Offset
(1)Automatic Adjustment of the Torque Reference Offset
When using torque control, the servomotor may rotate slowly even when 0V is specified as the analog reference voltage.
This occurs when the host controller or external circuit has a slight offset (measured in mv) in the reference voltage. In this
case, the reference offset can be adjusted automatically and manually using the panel operator.
The automatic adjustment of analog(speed,torque) reference offset(Fn003) automatically measures the offset and adjusts
the reference voltage.
The servo drive performs the following automatic adjustment when the host controller or external circuit has an offset in
the reference voltage.
Reference voltage
Offset
Torque reference
Reference voltage
Torque reference
Offset automatically adjusted in
the servodrive.
Automatic offset
adjustment
After completion of the automatic adjustment, the amount of offset is stored in the servo drive. The amount of offset can
be checked in the manual adjustment of torque reference offset(Fn004).
The automatic adjustment of analog reference offset(Fn003) cannot be used when a position loop has been formed with
the host controller and the error pulse is changed to zero at the servomotor stop due to servolock.
Use the torque reference offset manual adjustment(Fn004).
Note:
The analog reference offset must be automatically adjusted with the servo OFF.
(2)Manual Adjustment of the Torque Reference Offset
Manual adjustment of the torque reference offset(Fn004) is used in the following cases.
·
If a position loop is formed with the host controller and the error is zeroed when servolock is stopped.
·
To deliberately set the offset to some value.
·
Use this mode to check the offset data that was set in the automatic adjustment mode of the torque reference offset.
This mode operates in the same way as the automatic adjustment mode(Fn003), except that the amount of offset is
directly input during the adjustment.
The offset adjustment range and setting unit are as follows.
Torque reference
Offset adjustment range
Analog voltage input
Offset adjustment range:
-1024~+1024
Offset setting unit