11
12. PLC Timer Setting
Do not have the PLC timer setting to be done with the minimum setting.
Setting to “1” for 100msec timer turns ON at the timing from 0 to 100msec while 10msec timer
from 0 to 10msec for some PLC.
Therefore, the same process as when the timer is not set is held and may cause a failure such
as the actuator cannot get positioned to the indicated position number in Positioner Mode.
Set “2” as the minimum value for the setting of 10msec timer and when setting to 100msec, use
10msec timer and set to “10”.
13. Handling of Built-in Drive Cutoff Relay and Cautions in Caution in Handling
The product equips a built-in drive cutoff relay, and it is necessary to be careful in handling.
Use the product with narrow understanding to the following notes.
• The drive cutoff relay built in our controllers is designed under assumption of limited
frequency of use such as a case to require emergency stop of a system, and frequent
operation is not considered. Therefore, in a condition to require high frequency of use of the
drive cutoff relay such as a case to turn ON/OFF the driving source in every setup change,
the life of the relay may reach to the end in early stage.
• The relay itself may not meet a sufficient safety demand level when it is used in a system that
prioritizes safety in the drive cutoff system. It is necessary to construct a system to meet the
safety demand level in a circuit that a customer prepares.
• IAI products equip a built-in drive cutoff relay considering customer’s usage. However, as
described above, whether it can be used or not relies on such facts as the safety demand
level and frequency of drive cutoff. Please use it in limitation to the way to use as described
below.
• Do not expect reliability of the drive cutoff relay (Anything can do as long as driving source
can be cut off.)
• Take around 5 times a day as a reference to turn ON/OFF the drive cutoff relay.
• Thermistor type (which the resistance gets high and restrains in-rush current in low
temperature, and resistance gets low and reduce loss in high temperature) in-rush current
limiter circuit is equipped. Therefore, to keep the thermistor temperature as low as possible
when turning the power on is a key point to make degradation slower on such components
as the drive cutoff relay. As a reference, it is preferred to have approximately 30 minutes for
cooling after the driving source being cut off.
(Note) There is no built-in drive cutoff relay equipped in those types for 3000W or more.
Establish the construction of the circuit to have an external cutoff.
14. Regarding Battery-less Absolute Type Actuator
1) Make sure to have a home-return operation (absolute reset) after detaching the motor unit
from the actuator for motor replacement purpose and so on.
2) When using in Pulse Train Mode, turn ON the switch 1 in the front panel and set Parameter
No. 25 to 1.
3) For those models with 131072 pulse/rev for the number of encoder pulse such as ISB, the
electric gear ratio setting may exceed the upper limit of the internal arithmetic. In such a
case, adjust the unit movement amount to appropriate.
Also, contact IAI if the usage condition of wish cannot be satisfied.
4) There is the manufacturing number of the connectable actuator printed on the front panel
of the controller. Make sure to connect without mistake. The absolute error will occur if the
connection is wrong.
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