Service manual

SERVICE MANUAL TNC 415B/425
Page 76
Issue: 20.08.95
13. Encoders
13.1 Error Messages for Axes with Analogue
Speed Controller
ENCODER <AXIS> DEFECTIVE YA
A = signal amplitude error
ENCODER <AXIS> DEFECTIVE YB
B = signal frequency error
ENCODER <AXIS> DEFECTIVE YC
C = error with distance-coded scales
Y = CPU number 1 = main processor
2 = geometry processor
3 = CLP processor
13.1.1 Error Causes
• Glass scale contaminated or damaged
• Scanning head contaminated or defective
• Cable damaged
• Encoder input of the logic unit (LE) defective
13.1.2 Error Location
In order to determine whether the encoder or the encoder input of the logic unit is defective, the encoders
can be switched at the logic unit. For this purpose the corresponding machine parameters must be altered
as well:
Function MP Entry Value
Allocation of the axes X
to the encoder inputs Y
Z
IV
V
110.0
110.1
110.2
110.3
110.4
0 = X1
1 = X2
2 = X3
3 = X4
4 = X5
5 = X6
1)
1)
X6 may be used for a machine axis, if no oriented spindle stop is required.