IDEC SMARTRELAY User Manual page 198

IDEC SmartRelay functions
4.4 Special functions list - SF
Example
In a heating control system, the supply T
compared, for example with a sensor at AI2.
A control signal is to be triggered (for example heater On ) when the difference between the
supply and return line temperatures is greater than 15 C. 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.
The thermocouples available have the following technical data: -30 C to 70 C, 0 VDC to 10
VDC.
Application
-30 C to 70 C
0 C
Range of values:
-30 C to 70 C
On threshold
Off threshold
See also topic Calculating the gain and offset of analog values (Page 126) .
Configuration (example):
View in parameter assignment mode (example):
View in the message text (example):
186
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0 VDC to 10 VDC
100
15 C
5 C
and return line temperatures T
v
Internal mapping
0 to 1000
300
Offset -30
1000
Gain 100/1000
Threshold 15
Threshold 5
are to be
r
0.1
IDEC SmartRelay Manual