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ページを印刷するG) Customizing set-points (CH 1 Switch)
- This function is used when the user wants to set different set-points for
fully open and fully closed positions.
- For example, if the user wants to assign 5mA as the set-point for fully
closed position, first of all switch-on (move up) the CH1 switch (switch 4).
Supply a 5mA signal and push the ZERO button once. Hereafter, the
actuator will acknowledge 5mA signal as the set-point for fully closed
position and transmits 4mA feedback signal. Similarly, for setting the
set-point for the fully open position, supply the desired signal (for example,
19mA) and push the SPAN button once. Switch-off (move down) the
CH1 switch to complete the setting.
NOTE: During the Manual Operation mode, the input signal is ignored.
H) Reversal acting (CH 2 Switch)
- This function allows the user to reverse the input and output signals for the
operation of the actuator.
- For standard operation (CH 2 switch down), the input signal of 4mA
operates the actuator to fully close and the actuator transmits the
outputsignal of 4mA. However, when CH 2 switch is on (move up) the
input signal of 4mA operates the actuator to fully open and still transmits
4mA output signal.
- Manually move the actuator to half-open position and push ASCAN button
once to execute the Auto Setting (see 4.7.2 E). Supply signal and check the
operation.
I) Delay time
- The actuator starts to move if and only if the change in the input signal
value is greater than the resolution set value (see 4.7.2 J) and when the
signal value is maintained for the duration of the delay time.
- This prevents malfunction of the actuator caused by unwanted signals in
the input signal such as noise and interferences.
- Turning the Delay Time Dial in clockwise direction will increase the delay time
(Range 0.05 to 7.5 seconds).
DIAL
0
1
SEC
0.05
0.2
DIAL
8
9
SEC
4.0
4.5
J) Deadband
- The deadband adjusts the limits of the valve's deviation between an actual position
and a target position. The deadband is set to 0.12mA DC Max.
- Resolution indicates the extent of the reaction on the input signal.
- Low resolution setting may cause the actuator to seek or to unnecessarily respond to
a fluctuating input signal. If so, the resolution must be increased.
- Turning the deadband dial in clockwise direction will increase the resolution
(Range 0.0625mA to 1mA).
DIAL
0
1
mA
0.0625
0.125
0.1875
DIAL
8
9
mA
0.5625
0.625
0.6875
2
3
4
5
0.4
0.6
0.8
2.5
A
B
C
D
5.0
5.5
6.0
6.5
2
3
4
5
0.25
0.3125
0.375
A
B
C
D
0.75
0.8125
0.875
SET-POINTS
Fully Closed
Fully Open
ZERO
SPAN
Button
Button
CH 2 Switch
(Switch 5) On (up)
CH 2 Switch
(Switch 5) Off (down)
6
7
3.0
3.5
E
F
7.0
7.5
6
7
0.4375
0.5
E
F
0.9375
1
Know-how makes the difference
ADJUSTABLE RANGE
3-8 mA DC
16-21 mA DC
4mA DC Fully open
20mA DC Fully closed
4mA DC Fully open
20mA DC Fully closed
ASCAN
Button
Delay Time
Dial
Deadband
Dial
CH 1 Switch
(Switch 4)
CH 2 Switch
(Switch 5)
10