AB-7352-U
8
Setting
On the PCB (printed circuit board) of the actuator, the selector switches are provided.
CAUTION
Before wiring, maintenance or setting the selector switches, be sure to turn off the power to the product (including
the optional devices). Failure to do so might cause electric shock or device failure.
Detach the cover only when wiring, setting the product or maintenance and reattach the cover after wiring, setting
the product or maintenance. Failure to do so might cause electric shock.
Set the selector switches using a pen nib or a finger. Do not use a tool such as a screwdriver. Such a tool might
damage the selector switches or the PCB.
During engineering work, do not touch the uninstructed area other than the setting switches. Doing so, you might
be burned. Temperature of some parts of the actuator will become high.
IMPORTANT:
The service life of ACTIVAL operated with small dead band can be shortened since the ACTIVAL operates
more frequently with small dead band than with normal dead band.
To operate the product with small dead band, provide shielded cable for input/output signal lines and power
line. Unshielded cable can cause error due to noise.
Identification of the selector switches
Figure 3. Selector switches
Open/close selector switch for input signal failure:
If no control signal is input, the actuator automatically closes (0 %) or opens (100 %) the valve by setting the selector switch at
‘open’ (100 %) or ‘close’ (0 %).
Direction selector switch for control action of 4 to 20 mA input signal:
Direction of control action by 4 to 20 mA DC input signal can be reversely switched.
Normal action:
4 mA for 0 % to 20 mA for 100 %
Reverse action:
20 mA for 0 % to 4 mA for 100 %
Normal/small selector switch for dead band width:
To more precisely operate the valve, smaller dead band (than the normal) of the control signal input can be set. Two selector
switches are provided for the normal/small dead band width. Always set the both switches at the same mode (‘normal’ or
‘small’).
To swi‚”ch dead band,
change bo‚”h selec‚”or
swi‚”ches ‚”o ‚”he same
mode (normal/small)
posi‚”ion.
Signal
Signal
Failure
close
open
normal
small
Dead
Band
Mode (input)
ode (input)
Direction
tion
of Action
20...4mA
4...20mA
4...20mA
20...4mA
Direction
of Action
Mode (input)
Dead
Band
small
normal
open
close
Signal
Failure
Open/close selector switch
for input signal failure
(Initially set at ‘close’.)
Direction selector switch
for control action of 4 to 20 mA input
signal
(Initially set at normal action
(4 mA: 0% to 20 mA: 100%))
Normal/small selector switch
for dead band width
(Initially set at ‘normal’ dead band.)
