Encoder Communication Diagnosis Function; Usage - Mitsubishi Electric MELSERVO-JET MR-JET User Manual

4.12

Encoder communication diagnosis function

This servo amplifier has a function to diagnose the failure of the differential driver or receiver used for the encoder
communication circuit.
By inputting the diagnostic signal to the encoder communication circuit, an error on the differential driver or receiver is
detected.
An encoder communication alarm can be caused by many factors including noise, a servo amplifier failure, an encoder failure,
or an encoder cable disconnection; as such, it takes time to identify the alarm cause. This function determines if the alarm is
caused by a servo amplifier failure, which helps to identify the alarm cause promptly.
Whether the encoder
communication circuit has
a failure can be diagnosed.
Servo amplifier
Control
microcomputer
Precautions
• When not using a two-wire type encoder cable, diagnose the encoder communication circuit with the encoder cable
disconnected to prevent the encoder and the servo amplifier from malfunctioning.
• Remove the encoder cable with the power supply of the servo amplifier turned off.
• MR Configurator2 is required for this function.
• [AL. 118.1 Encoder communication circuit diagnosis in progress] occurs when the encoder communication circuit diagnosis
is in progress.

Usage

To enable the diagnosis mode, set "1" (enabled) in [Pr. PC05.4 Encoder communication circuit diagnosis mode selection] and
cycle the power. Remove the encoder cable at power off. During the diagnosis mode, [AL. 118.1 Encoder communication
circuit diagnosis in progress] occurs. Perform the diagnosis in accordance with the items displayed on the encoder
communication circuit diagnosis screen of MR Configurator2.
Servo Symbol
parameter
PC05.4 **COP2
Encoder
C
communication
N
circuit
2
Name Outline
Encoder communication Enable or disable the encoder communication circuit diagnosis mode.
circuit diagnosis mode [AL. 118.1 Encoder communication circuit diagnosis in progress] occurs during the encoder
selection communication circuit diagnosis mode.
0: Encoder communication circuit diagnosis mode disabled
1: Encoder communication circuit diagnosis mode enabled
Initial value: 0h
Serial
communication
encoder
4.12 Encoder communication diagnosis function
4 APPLICABLE FUNCTIONS
4
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