Filter
Top Products
182 • Chapter 9 Troubleshooting DMC-1700/1800
Unable to read main or
auxiliary encoder input.
The encoder does not work
when swapped with
another encoder input.
1. Wrong encoder
connections.
2. Encoder is damaged
3. Encoder
configuration incorrect.
Check encoder wiring. For single
ended encoders (CHA and CHB
only) do not make any connections
to the CHA- and CHB- inputs.
Replace encoder
Check CE command
Unable to read main or
auxiliary encoder input.
The encoder works
correctly when swapped
with another encoder input.
1. Wrong encoder
connections.
2. Encoder
configuration incorrect.
3. Encoder input or
controller is damaged
Check encoder wiring. For single
ended encoders (CHA and CHB
only) do not make any connections
to the CHA- and CHB- inputs.
Check CE command
Contact Galil
Encoder Position Drifts
Swapping cables fixes the
problem
1. Poor Connections /
intermittent cable
Review all terminal connections
and connector contacts.
Encoder Position Drifts
Significant noise can be
seen on CHA and / or CHB
encoder signals
1. Noise Shield encoder cables
Avoid placing power cables near
encoder cables
Avoid Ground Loops
Use differential encoders
Use +/-12V encoders
Communication
SYMPTOM DIAGNOSIS CAUSE REMEDY
Cannot communicate with
controller.
Galil software returns error
message when
communication is
attempted.
1.
Address conflict
2. IRQ address
3.
Address selection
does not agree with
registry
information.
Change address jumper positions,
and change if necessary (Chap 4)
Select different IRQ
From Galil software, edit Galil
Registry
Stability
SYMPTOM DIAGNOSIS CAUSE REMEDY
Servo motor runs away
when the loop is closed.
Reversed Motor Type
corrects situation (MT -1)
1. Wrong feedback
polarity.
Reverse Motor or Encoder Wiring
(remember to set Motor Type back
to default value: MT 1)
Motor oscillates.
2.
Too high gain or
too little damping.
Decrease KI and KP. Increase KD.