IAI America SCON-CA - Manual (Page 248)

Chapter 9
Troubleshooting
238
9.2 Fault Diagnosis
This section describes faults largely divided into three types as follows:
(1) Impossible operation of controller
(2) Positioning and speed of poor precision (incorrect operation)
(3) Generation of noise and/or vibration
9.2.1 Impossible operation of controller
Situation Possible cause Check/Treatment
At power-on, PWR on
the status indicator LEDs
does not go ON.
Proper power is not supplied. Check the voltage.
If the PWR LED does not go on despite
normal power voltage and correct
wiring, Please contact IAI.
[Refer to 2.3.1 Wiring of Power Circuit.]
EMG on the status
indicator LEDs lights.
During emergency-stop.
1) Was the emergency-stop switch.
2) The emergency stop release
circuit is OFF to make the
connection between EMG+ and
EMG- of the system I/O
connector open.
3) EMG+/- of the system I/O
connector are not connected.
1) Release the emergency stop switch.
2) Check the emergency stop circuit.
3) Check the wiring of system I/O.
[Refer to 2.3.2 Wiring for Emergency
Stop Circuit.]
ALM in the status display
LEDs turns on when the
power is supplied.
Occurrence of alarm Check the error code with the teaching
tool being connected and remove the
cause by referring the alarm list.
[Refer to 9.4 Alarm List.]
The host controller
(PLC) sends servo ON
signal to the controller,
but SV LED does not go
ON.
The host controller
(PLC) cannot control
PIO (24V DC I/O).
PIO signal communication is
disabled.
1) 24V DC power for PIO is not
supplied.
2) Poor contact of flat cable
3) The operation mode setting
switch on the front panel is on
“MANU” side.
4) The +/- pins of 24V DC power
for PIO are connected inversely.
1) Check the PIO power voltage. If a
single power supply is connected
with large load, the power supply
voltage may drop or the output may
be shut down depending on power
units.
2) Are the PIO cable connectors
inserted to the mating connectors
securely? Check the input signals
on the I/O monitor of the teaching
tool such as PC software.
Caution
In I/O cable conduction check, do not
widen female pins of the connectors.
Failure to follow this may cause poor
contact.
3) Can such operation as jogging be
performed from the teaching tool
such as PC software? Set the
operation mode setting switch on
the front panel and restart the
controller.
[Refer to Name for Each Parts and
Their Functions.]
4) Reverse connection of the PIO
power supply does not affect the
input circuit but makes the output
circuit faulty. Check if the I/O of the
host controller (PLC) operates
normally.