HEIDENHAIN ND 1200 - Manual (Page 73)

ND 1200 QUADRA-CHEK 73
1
.1
0 Er
ro
r Indications
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
reader head Repair or replace the encoder.
Misaligned
encoder reader
head Recalibrate the reader head.
Electrical noise on
the encoder input Verify that the earth ground provided by the
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)
velocity too high Restrict stage velocity. If the velocity
required for error-free operation is slow,
recalibrate the reader head.
Faulty encoder
input connection Repair or replace the encoder cable or seek
the assistance of your Metronics
distributor.