IDEC SmartRelay functions
170
IDEC SmartRelay Manual
Calculation rule
• If the On threshold ≥ Off threshold, then:
Q = 1, if:
(actual value Ax - actual value Ay) > On
Q = 0, if:
(actual value Ax - actual value Ay) ≤ Off.
• If the On threshold < Off threshold, then Q = 1, if:
On ≤ (actual value Ax - actual value Ay) < Off.
Preset of the Par parameter
The gain and offset parameters are used to adapt the sen-
sors to the relevant application.
View in programming mode:
Press
Example
In a heating control system, the supply T
v
and return line
temperatures T
r
are to be compared, for example with a sen-
sor at AI2.
A control signal is to be triggered (for example "heater On"),
when the difference between the supply and return line tem-
peratures is greater than 15°. The control signal is reset
when the difference is less than 5°C.
The process variable of the temperature is to be shown in
parameter assignment mode.
B3 1+
On =+00000
Off =+00000
Parameter protection mode
On threshold
Off threshold
B3 2
A =00.00
B =+00000
p=0
Gain
Offset
Decimals in the message text
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
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