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Servo Adjustment
6.1.4 Adjusting Offset
6.1.3 Adjusting Gain
6.1.4 Adjusting Offset
6
IMPORTANT
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If speed loop gain or position loop gain exceeds the allowable limit for the servo system includ-
ing the machine to be controlled, the system will tend to vibrate or become too sensitive. Smooth
operation is not possible under such conditions, so reduce each loop gain value to an appropriate
value.
Refer to 6.2.1 Setting Servo Gain for details regarding servo gain adjustment.
The servo system does not operate smoothly if reference voltage from the host controller or ex-
ternal equipment has a reference offset value in close proximity to 0 V. In that case, adjust the
reference offset value to 0 V.
J J Reference Voltage Offset from Host Controller or External
Circuitry
Reference
voltage
Reference speed
or reference
torque
J J Reference Offset Adjustment
The following two methods are available to set the reference offset value to 0 V.
Reference offset automatic adjustment
Reference offset manual adjustment
If a position loop is formed in the host controller, be sure to make manual offset adjustment and do not make
automatic reference offset adjustment.
Refer to the following sections in Chapter 7 Using the Digital Operator for reference offset ad-
justment in detail.
Reference Offset Automatic Adjust-
ment
Reference Offset Manual Adjustment
Reference
Offset
voltage
Offset adjustment
The reference offset value is automatically set to 0 V.
The reference offset value can be adjusted manually.
7.2.3 Automatic Adjustment of the Speed and Torque Refer-
ence Offset
7.2.4 Manual Adjustment of the Speed and Torque Reference
Offset
6 -4
Make offset
adjustment with the
Servopack
Reference speed
or reference
torque
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