IAI America PCON-CF - Manual (Page 104)

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6. Data Entry <Basics>
„ Full servo control mode
The pulse motor is servo-controlled to reduce the holding current.
Although the exact degree of current reduction varies depending on the actuator model, load condition, etc., the
holding current decreases to approx. 1/2 to 1/4.
Since the servo remains on, position deviation will not occur.
The actual holding current can be checked in the current monitor screen of the PC software.
Take note that micro-vibration or noise may occur in certain conditions where external force is applied, or
depending on the position where the actuator has stopped.
If micro-vibration or noise presents problem, do not use this mode.
„ Automatic servo-off mode
After positioning is completed, the servo will turn off automatically upon elapse of a specified time.
(Since no holding current flows, power consumption will decrease.)
When the next movement command is received from the PLC, the servo will turn on and the actuator will start
moving.
* Since the servo turns off once, some position deviation may occur. Do not use this function at standby
positions where position deviation will cause problem.
You should also note that the position complete (PEND), completed position number (PM1 to PM256) and
movement complete (PE0 to PE6) signals will turn OFF because the servo turns off. However, you can keep the
signals ON via a parameter in situations where the PLC sequence circuit is designed in such a way that
problems will occur if complete signals turn OFF.
Setting of parameter No. 39
(Output mode of position
complete signal)
[1] PIO pattern = 0 to 3
Position complete (PEND) signal status, completed position number (PM1
to PM256) signal status
[2] PIO pattern = 4
Position complete (PEND) signal status, movement complete (PE0 to
PE6) signal status
0 [PEND] The signal will turn OFF unconditionally when the servo turns off.
Even when the next movement command is issued and the servo turns on
again, the actuator has already started moving to the next target position,
so the signal still remains OFF.
1 [INP] Even when the servo is off, the signal turns ON if the current position is
within the range set by the “Positioning band” field of the position table,
with respect to the target position, and turns OFF if the current position is
outside this range.
(Note) The factory setting is “0.”