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
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