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17.TROUBLESHOOTING
This chapter describes probable types of trouble and check points for them in using the C-875.
Symptom
Check point
1
*BUSY BIT in STATUS1 never becomes 0.
*Isn't LOW LEVEL input to the RESET signal?
Or BUSY BIT in STATUS1 does not become 1
*Is I/O ADDRESS(S1 and S2) setting is correct?
after a command is written.
2
*Access seems to have been made normally.
*Isn't the output pulse 0 INDEX DRIVE?
However, even if a pulse output command
(e.g., when the specified absolute address is the
is written, pulse output is not perform.
current position)
At this time, both DRIVE BIT and BUSY BIT
*Check each of ERROR, LSEND and FSEND BITS in STATUS1.
in STATUS1 are 0.
For details, refer to 4-8.
3
*Access seems to have been made normally.
*Refer to the check point in 2.
However, when a pulse output command is
*Isn't HIGH LEVEL input to the DEND signal by SERVO
written, pulse output is not performed.
specification?
At this time, both DRIVE BIT and BUSY BIT
in STATUS1 are 1.
4
*Pulse output was started but never
*Isn't SCAN, SPECIAL SCAN or ORG DRIVE performed?
terminated.
*In case of INDEX DRIVE:
When INCREMENTAL is specified
The specified number of pulses is large.
When ABSOLUTE is specified
The specified address is remote.
The above causes are probable.
In this case, DRIVE will stop before long.
5
*Pulse output was terminated. However,
*Is SERVO MOTOR set? Isn't the DEND signal at HIGH LEVEL?
BUSY BIT in STATUS1 does not become 0.
BUSY BIT in STATUS1 becomes 0 by causing this signal to go
to the low level.
6
*Machine origin detection (ORG DRIVE)
*Is the sensor logic (ON when light enters or OFF when
cannot be performed normally.
light enters) correct?
Or machine origin detection is never
*Is sensor connection (specially GND line) correct?
terminated.
*Isn't edge 1 formed in the CCWLM area because the shield
plate is too long in case of the ORG1 or ORG3 type?
*In case of the ORG2,ORG3,ORG4 or ORG5 type , be careful
about an effect of mechanical vibration.
If any vibration exists, use ORG0 or ORG1, or make LD,SD
and JD longer by the ORIGIN DELAY SET command.
*When SERVO MOTOR is set, check the DEND signal for each
process.
Accordingly, if DEND is not returned, it will
stop at a process on the way.
*When ORG3 or ORG5 is selected to complete ORG DRIVE in
the ORG sensor, the sensor may be turned off by slight
mechanical vibration because it enters only 1 pulse
from the sensor edge a into the sensor area when ORG
DRIVE is completed. In this case,make a correction so
that INDEX DRIVE may be performed several pulses in
the +(CW)direction after ORG DRIVE is completed with
the result that it can enter surely into the sensor area.
Summary of Contents for C-875
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