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Set-up double point control – VEGA VEGASEL 643 User Manual

Page 12

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VEGASEL 643

Set-up

Double point control

With a double point control it is possible to generate
switching signals at two different points of the input
signal (0/2 … 10 V or 0/4 … 20 mA).

Procedure

• Adjust the coded key with different values.
• Possible adjustment range 1 % … 99 %.
• As example min. = 20 %, max. = 60 %, with this

adjustment there is a hysteresis of 40 %.

• The auxiliary level switch is hence ready for opera-

tion. Please cover with the transparent cover (15).

Note:
Adjust the percentage values with the coded keys
which relate to the input signal.

Example 1

- Voltage input 0 … 10 V
- Two-point control

- Switch points min. = 20 %, max. = 60 %

0 … 10 V corresponds to 0 % … 100 %,

= 10 V

20 % of 10 V = 2 V

60 % of 10 V = 6 V

Switch point 20 % corresponds to 2 V
Switch point 60 % corresponds to 6 V

Example 2

- Voltage input 2 … 10 V

- Two-point control
- Switch points min. = 20 %, max. = 60 %

2 … 10 V corresponds to 0 % … 100 %,

= 10 V – 2 V = 8 V

20 % of 8 V = 1,6 V
60 % of 80 V = 4,8 V

Switch point 20 % corresponds to 1,6 V + 2 V = 3,6 V

Switch point 60 % corresponds to 4.8 V + 2 V = 6,8 V

Example 3

- Current input 0 … 20 mA

- Two-point control
- Switch points min. = 20 %, max. = 60 %

0 … 20 mA corresponds to 0 % … 100 %,

= 20 mA

20 % of 20 mA = 4 mA
60 % of 20 mA = 12 mA

Switch point 20 % corresponds to 4 mA
Switch point 60 % corresponds to 12 mA

Example 4

- Current input 4 … 20 mA
- Two-point control
- Switch points min. = 20 %, max. = 60 %

4 … 20 mA corresponds to 0 % … 100 %,

= 20 mA – 4 mA = 16 mA

20 % of 16 mA = 3,2 mA

60 % of 16 mA = 9,6 mA

Switch point 20 % corresponds to 3,2 mA + 4 mA =
7,2 mA
Switch point 60 % corresponds to 9,6 mA + 4 mA =

13,6 mA

The calculation and information examples are valid in
the same way for the single point control.

t

60

%

100

0

20

12 13 14

12 13 14

Coded key

max. 60

^ Hysteresis

40 %

min. 20

Mode A

Mode B