Simex SRD-99, Руководство пользователя

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User manual - DATA RECORDER SRD-99 and cooperating software
In case of often threshold overpass (large readings oscillations) the ” Close delay ” and
” Open delay ” parameters in opposite to ” Closed hold time ” and ” Open hold time ” will delay
switching output state until internal time counter reaches entered value. The counter is
counting up (to the entered value) when logic function is
1 and counting down to 0 when logic
function is
0
. The way how it works is described in
Fig. 6.30
.
6.3.3. Example of output control
Outputs have limited current rating. Do not use outputs to supply external
devices that requires a lot of power like heaters, motors or others. Instead, use
external supply devices like power relays or others that can be controlled by
output.
If simple temperature control in some room is required this device can be used to do this.
Assuming there is a heater and cooler that we can control by outputs and single temperature
sensor. We must connect a sensor to some input, output 1 to control the heater and output 2
to control the cooler. The input channel where temperature sensor is connected must be
configured correctly (in this example it is assumed reading is in Celsius degree).
If lower limit of the temperature when heater should be turned on is 18 degree and upper
limit when cooler should be turned on is 27 degree, alarm settings should be as follows
(assuming decimal point ”
0.0 ”):
”
AL1 mode
” - ”
under threshold
”
” Threshold 1 ” - 19.0
” Hysteresis 1 ” - 1.0
” AL2 mode ” - ” over threshold ”
”
Threshold 2
” - 26.0
”
Hysteresis 2
” - 1.0
When alarm 1 is generated this means that the temperature reaches 18 degree ( 19.0 – 1.0) .
When temperature reaches 20 degree ( 19.0+1.0 ) alarm 1 will disappear. Similar, when
temperature reaches 27 degree (
26.0
+
1.0
) alarm 2 will appear and when temperature
reaches 25 degree ( 26.0 – 1.0 ) alarm 2 will disappear.
Now we have to configure outputs to use those alarms. In ”
Outputs settings
” menu
fallowing example parameters must be set:
Output 1 (heater control)
”
Mode ” - ” N.O. ”
” Logic funct. ” - ” AND ”
” Source : channel 1 ” - ” alarm 1 ” - heater alarm
”
Close delay
” - ”
120.0
” - heater turning on delay
”
Open delay
” - ”
30.0
” - heater turning off delay
” Closed hold time ” - ” 180.0 ” - minimal time that heater should work
” Open hold time ” - ” 150.0 ” - minimal time that heater should be turned off
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