Scale Measurement Function [G] [Wg]; Outline - Mitsubishi Electric MELSERVO-J5 Series User Manual
Ac servo system
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Also See for MELSERVO-J5 Series:
- User manual (580 pages) ,
- Sample screen manual (128 pages) ,
- Quick connection manual (64 pages)
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4.3
Scale measurement function [G] [WG]
This function is available on servo amplifiers with firmware version A5 or later.
Precautions
• If a linear encoder is used as a scale measurement encoder for this servo amplifier, refer to the following manual.
MR-J5 Partner's Encoder User's Manual
Outline
The scale measurement function transmits the position information of a scale measurement encoder by connecting the
encoder to the servo amplifier in the state of the semi closed loop control.
If the scale measurement function is used for MR-J5-_G_ and MR-J5W2-_G_ servo amplifiers, the following
restrictions apply. However, these restrictions do not apply to the MR-J5-_G_-RJ_ servo amplifier. Note that
this function cannot be used on the MR-J5W3-_G_ servo amplifier. Enabling the scale measurement function
on the MR-J5W3-_G_ servo amplifier triggers [AL. 037 Parameter error].
• A/B/Z-phase differential output type encoders cannot be used as a scale measurement encoder.
• Only the scale measurement encoders with the two-wire type communication method can be used for this
function. The scale measurement encoders and servo motor encoders with the four-wire type
communication method cannot be used.
The scale measurement function cannot be used in the fully closed loop control mode. Enabling the scale
measurement function in the fully closed loop control mode triggers [AL. 037 Parameter error].
The scale measurement encoders can be used as HK-KT servo motor encoders, linear encoders, or A/B/Z-
phase differential output type encoders. For scale measurement encoders that can be used with this servo
amplifier, contact your local sales office.
If the network communication cycle is less than 125 μs when the scale measurement function is enabled, [AL.
09E Network warning] occurs.
If the network communication cycle is less than 250 μs when the scale measurement function is enabled on
the MR-J5W2-_G_ servo amplifier, [AL. 09E] occurs.
Precautions
• When the Mitsubishi Electric servo motor equipped with a batteryless absolute position encoder is used, the absolute
position data is erased under the following conditions.
The servo motor or servo amplifier is replaced.
[Pr. PA22.3 Scale measurement function selection] is set to "0" (disabled) or "2" (use with incremental system).
• In the case of using the Mitsubishi Electric servo motor equipped with a batteryless absolute position encoder, [AL. 01A
Servo motor combination error] occurs if the servo motor that was connected to the absolute position detection system at
startup was changed to another servo motor.
In such cases, reconnect the servo motor that was connected at the startup of the absolute position detection system to
operate without losing the absolute position data.
When replacing a servo motor, refer to the following.
Page 170 Procedure for replacing the Mitsubishi Electric servo motor equipped with a batteryless absolute position
encoder
4 APPLICABLE FUNCTIONS
4.3 Scale measurement function [G] [WG]
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