Okuma Alarm-A 1121 PSC Optical scale encoder error
An error was detected by the position encoder of optical scale.
XX:Value of the J-type endoder and value of the optical scale are too different.
bit0:It is too different by a positive sign.
YY:Pulse count value of optical scale
ZZ:The amplitude of the optical scale signal is wrong.
bit0:The amplitude of A-phase is wrong.
Probable Faulty Locations
– Breakdown of optical scale
– Breakdown of optical scale cable
Measures to Take
– Exchange of optical scale
– Exchange of optical scale cables