Shenzhen Just Motion Control electromechanics co., ltd

0755-26509689

E.645: Bus Encoder Multiturn Overflow Fault

Fault alarm reason

Bus encoder turns out of range

Fault alarm check

The number of turns can be

monitored through the monitoring

mode d21.ASH, and the multi-turn

absolute motor cannot rotate in one

direction for a long time.

disposal measures

Alarm can be cleared via F06.EN0

Clear the multi-turn value using the

command F07.En1

Alarm can be switched off via

parameter P00-07

E.646: Encoder communication failure

Fault alarm reason

Encoder communication failure

Fault alarm check

Check Encoder

disposal measures

Correct installation of encoder

E.649: Encoder Communication CRC Failure

Fault alarm reason

Encoder communication CRC

failure

Fault alarm check

Check Encoder

disposal measures

Correct installation of encoder

A.900: Excessive positional deviation

Fault alarm reason

Excessive position deviation

warning

Gain value set too small

Internal torque limit set too small

Fault alarm check

Confirm parameter setting of

P03-15/P03-30 (excessive position

deviation setting)

Confirm whether the gain

parameters are set reasonably

Confirm internal torque limit value

Excessive external load

Check external load

disposal measures

Increase P03-15/P03-30 (excessive

position deviation setting) setting

Readjust the gain class parameters

correctly

Readjust the internal torque limit

correctly

Reduce the load or replace the

high-power motor

A.901: Excessive position deviation when servo is ON

Fault alarm reason

Excessive position deviation when

servo is ON

Pulse command frequency is too

high when servo is ON

Fault alarm check

Confirm P03-31/P03-33 parameter

setting

Pulse command frequency is too

high when servo is ON

disposal measures

Increase P03-31/P03-33 setpoint

Reduce the pulse command

frequency when servo is ON

A.905: FN function cannot be executed when servo is ON

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