Chapter 2. Troubleshooting
2 5
Motion Architect's Panel Module
As an alternative to the test program noted above, you can use the Panel Module in Motion
Architect. The Panel Module allows you to set up displays for the purpose of testing various
system I/O and operating parameters.
Technical Support
If you cannot solve your system problems using this documentation, contact your local
Automation Technology Center (ATC) or distributor for assistance. If you need to talk to our
in-house application engineers, please contact us at the phone/FAX/BBS numbers listed on the
inside cover of this manual. (The phone numbers are also provided when you issue the
HELP
command to the AT6n00.) NOTE: The BBS contains the latest software upgrades and late-
breaking product documentation.
Common Problems & Solutions
N O T E
Some software-related causes are provided because it is sometimes
difficult to identify a problem as either hardware or software related.
Problem
C a u s e
Solution
Communication errors.
1. Communication program looking for
card at wrong address.
2. Address conflict.
3. AT6n00 card not properly seated.
1. Select correct address for communication program.
2. See
Address Selection section below.
3. Seat board properly in slot. Apply pressure directly over area with
gold card edge fingers.
Computer will not boot
with AT6n00 installed.
1. Interrupt conflict.
2. See problem:
Communication Errors.
1.a. Turn interrupt DIP switches OFF.
1.b. See
Interrupt Selection section below.
Direction is reversed.
1. Direction connections on AUX board
reversed.
2. Phase of step motor reversed.
1. Switch DIR+ with DIR- connection to drive.
2. Switch PHA+ with PHA- connection from drive to motor.
Distance is incorrect as
programmed.
1. Incorrect resolution setting.
2. Pulse width too narrow.
1.a. Set the resolution on the drive (usually set with DIP switches) to
match the AT6n00's
DRES
command setting (default
DRES
setting is
25,000 steps/rev).
1.b. Match the AT6n00's
ERES
command setting (default
ERES
setting is
4,000 counts/rev) to match the post-quadrature resolution of the encoder.
Resolution values for Compumotor encoders:
E Series: 1000-line (4000 counts/rev post quad)
OS motor with -HJ encoder (OSxxx-xxx-HJ): 512 lines
OS motor with -RE encoder (OSxxx-xxx-RE): 1000 lines
OS motor with -RC encoder (OSxxx-xxx-RC): 1000 lines
RS motor with -EC encoder (RSxxx-xxx-EC): 1000 lines
OEM Series motors (stepper):
83 size: 1000 lines (4000 counts/rev post quad)
57 size: 512 lines (2048 counts/rev post quad)
3. Set pulse width to drive specifications using the
PULSE
command.
(default pulse width setting is 0.3
µ
sec).
Encoder counts missing.
1. Improper wiring.
2. Encoder slipping.
3. Encoder too hot.
4. Electrical noise.
5. Encoder frequency too high.
1. Check wiring.
2. Check and tighten encoder coupling.
3. Reduce encoder temperature with heatsink, thermal insulator, etc.
4a. Shield wiring.
4b. Use encoder with differential outputs.
5. Peak encoder frequency must be below 1.6MHz post-quadrature. Peak
frequency must account for velocity ripple.
Erratic operation.
1. Electrical Noise.
2. Improper shielding.
3. Improper wiring.
1. Reduce electrical noise or move AT6n00 away from noise source.
2. Refer to the Electrical Noise portion of the Technical Reference
section in the Compumotor/Digiplan catalog and Appendix A.
3. Check wiring for opens, shorts, & mis-wired connections.
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