Dodge Engineering & Controls, Inc.
Toll Free (877) 334-2875 Fax: (978) 244-1422
Installation
ES142 Spring Return Electronic Actuators
129-270 EAI/ES-8 DEI, Inc.
Zero Span Control Signal Adjustment (-ZS option)
The offset (start point) and
span of the control signal
can be adjusted. The offset,
U0, can be adjusted between
0 to 5 VDC. The span, ∆U,
can be adjusted between 2
to 30 VDC.
100
0
U
O
ΔU (max. 30 V) Y
U
(v)
Y
S
(%)
EA0411R1
2 5 10 35
2)1) 3)
Ys Mechanical positioning range
(100% = angle of rotation 90°)
Yu Control signal
U0 Offset (start point)
∆U Span
Examples above:
Ex. 1. U0 = 0V, ∆U = 2V The minimum working
range for Ys = 100%.
Ex. 2. U0 = 5V, ∆U = 30V The maximum working
range for Ys = 100%
Ex. 3. U0 = 0V, ∆U = 10V Factory setting
Offset, Uo
2
4
01
3
5
Span, U
30
2
15
10
5
20
25
Control
Signals
Uo U
EA0287R1
Figure 14. The Minimum and Maximum Control Signal
Adjustment. Figure 15. Setting for
10V Span, 0 Offset.
Example:
Open the actuator from 0% to 50% (45°) using a control signal of Umin = 2V to Umax = 10V.
Calculating the value of ∆U:
V16
50 2)(10x100
%inrotationofangleWorking min)Umax(U%][100
U=
−
=
−
=Δ
Settings:
Offset U0 = 2, Span: ∆U = 16V
Umin = minimum control signal
Umax = maximum control signal
100
0
ΔU (16 V)
Y
U
(v)
Y
S
(%)
21810
U
min
U
max
50
U
o
EA0412R1
Figure 16. Example.
