1.10 Error Indications; Scale Errors - HEIDENHAIN ND 1200 - V2.16 Operating Instructions Manual

1.10 Error Indications

Scale errors

Only input encoder scale errors are reported by the ND 1200. Scale
errors are indicated by the presence of graphic bars across the DRO
screen instead of numbers. Scale errors can be caused by a few
conditions shown in this table:
Possible cause Corrective action
Damaged encoder Repair or replace the encoder.
reader head
Misaligned Recalibrate the reader head.
encoder reader
head
Electrical noise on Verify that the earth ground provided by the
the encoder input ND 1200 power source is in good condition
and is connected to the power system
ground.
Verify that the encoder cable is shielded
and that the shield is connected to ground
at the ND 1200 end.
Verify that the reader head is not generating
electrical noise.
Stage (encoder) Restrict stage velocity. If the velocity
velocity too high required for error-free operation is slow,
recalibrate the reader head.
Faulty encoder Repair or replace the encoder cable or seek
input connection the assistance of your Metronics
distributor.
ND 1200 QUADRA-CHEK 73