Справочник Пользователя для Mitsubishi Electronics QD75MH2

 
 

 

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MELSEC-Q

 

15   TROUBLESHOOTING 

 

 
 

Classifica

tion of 

errors 

Error 
code 

LED 

indicator 

of servo 

amplifier 

Error name 

Description 

Cause 

 
 

The encoder connecter (CN2) is 
disconnected. 

 
 

Fault in the encoder. 

 

2020 

20 

Encoder error 2 

Communication error occurred 
between encoder and servo amplifier. 

Encoder cable fault. (Wire breakage 
or shot) 

 
 

Power input wires and servomotor 
power wires are in contact. 

 
 
 
 
 

Sheathes of servomotor power 
cables deteriorated, resulting in 
ground fault. 

 
 
 

2024 

24 

Main circuit error 

Ground fault occurred at the 
servomotor power (U, V and W 
phases) of the servo amplififer. 

Main circuit of servo amplifier failed.   

Voltage low in the super capacitor in 
the encoder. 

 
 
 
 

Battery voltage low. 

 

Absolute position data in error. 

Battery cable or battery fault. 

 

2025 25 

Absolute position 
lost 

Power was switched on for the first 
time in the absolute position detection 
system. 

Home position not set. 

 
 
 
 

Parameter " Pr.102 Regenerative 

brake resistor" setting value error. 

 
 

Built-in regenerative brake resistor 
or regenerative brake option is not 
connected. 

 
 
 

High-duty operation or continuous 
regenerative operation caused the 
permissible regenerative power of 
the regenerative brake option to be 
exceeded. 

 
 
 
 
 
 

Power supply voltage is abnormal. 
   MR-J3-B  : 260VAC or more 
   MR-J3-B1: 135VAC or more 

 
 
 

Permissible regenerative power of the 
built-in regenerative brake resistor or 
regenerative brake option is 
exceeded. 

Built-in regenerative brake resistor 
or regenerative brake option faulty. 

 
 

Servo 

amplifier 

errors 

2030 30 

Regenerative 
error 

Regenerative transistor fault 

Regenerative transistor faulty.