MLX200 Alarm 800

In a MLX200 system, this alarm indicates a failure in EtherCAT communication.  A corresponding alarm should be displayed on the sevopacks.  This could A.A10, A.A11 or A.A112, these digits will cycle across the 8 segment display.  It should show on all servo drives, not just one.

The error log will show something like this:

   ************************ +++ ERROR DETAIL +++ ******************************
   ErrorNumber: 800
   OEMErrorNumber: 800
   Origin: Servo Drive
   Type: Fault
   Message: Ethercat Software Error
   ExtendedDescription: Ethernet frame response error
   Recovery: Hardware Reset Required
   RemedyDescription: Consult MLxServo.log and MLxServoError.log for more information.
   ************************ --- ERROR DETAIL --- ******************************
 

To solve the alarm try the following:

FIRST, Cycle Power

This is the only way to clear and reset the alarm.  But if the error occurs again quickly, then some other hardware change shoudl probably be made.

NEXT, Check EtherCAT cabling

1. Often when this alarm occurs, it because the EtherCAT communication cables are routed close to 3-phase or motor power. The noise in 3-phase is interfering with EtherCAT communication and causes these alarms. This is most likely caused by the cable between SV0 and the MLX200 Control Module (the cables between each amplifier are too short for any changes to the standard servo panel configuration).
   1. This cable should not be put into the wire trays, or if it is, then it must be routed away from 3-phase.
   2. It might be possible to put the cable into wireway properly on the “right side of the panel” depending on the robot type and also depends on who built the panel – the wireway needs to be inspected to verify if AC voltage is present.
2. Finally confirm that the supplied ethernet cable is being used – Cat5e – Shield Twisted Pair, with Metal Grounds on both ends. Use a multimeter to confirm continuity through the shell on both ends.  
   1. Sometimes a cable without continuity may be used and this will cause a problem.  Contact YSS to purchase a proper replacement cable in various lengths.