IAI America SCON-CA - Manual (Page 252)

Chapter 9
Troubleshooting
242
[In the case of Pulse String Control Mode]
Situation Possible cause Check/Treatment
The actuator does not
stop at the command
position.
PIO signal processing or parameter
setting is incorrect.
1) Incorrect electronic gear ratio
2) Acceleration/deceleration is set
incorrectly in the host controller.
3) Noise
4) The pulse-train type, a
parameter, is selected
incorrectly.
5) The unit moving distance per
pulse, which is a setting
condition of electronic gear ratio,
a parameter, is too small.
1) Check the setting of electronic gear
ratio. The host controller also has
the electronic gear ratio parameter.
Set the electronic gear ratio not to
be inconsistent with that of the host
controller. In addition, reduce the
electronic gear ratio as much as
possible. If not, data overflow may
occur in arithmetic processing to
disable correct positioning.
[Refer to 3.3.4 [1] Electrical Gear
Setting.]
2) The actuator operates at the speed
and acceleration/deceleration based
on the frequency of input pulses.
Check if the
acceleration/deceleration set in the
host controller exceed the rating
acceleration/deceleration of the
actuator.
3) Noise can be misread as the pulse if
it jumps into the pulse train.
Take proper measures against
noise. [Refer to 1.7 Noise
Elimination and Mounting Method.]
Check the cable connection
between the controller and AK-04 if
AK-04 is used.
• Cable length :
50mm or shorter recommended
(as short as possible)
• Shield treatment :
Use the shield treatment wire.
4) Check the pulse-train type.
[Refer to 3.3.4 [2] Format Settings of
Command Pulse Train.]
5) Do not make the unit moving
distance less than the resolution of
the encoder. The actuator does not
move unless pulses by the
resolution of the encoder are input.
[Refer to Caution in 3.3.4 [1]
Electrical Gear Setting]
(Note) In case of 2) or 3), the
actuator may not sometimes
operate.
You may not find case 4)
when the actuator is moved
for a long distance at a high
frequency.
There is an impact at
start or stop
[Refer to 8.3 Servo Adjustment
No.7]