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8.3 “PWM” proportional CD & proportional water meter (relay)
“CD RELAY 1” and “CD RELAY 2” outputs can be set into this mode.
Pulse-width modulation (PWM) of a signal or power source involves the modulation of its duty cycle, to either convey
information over a communications channel or control the amount of power sent to a load.
This mode works over a settable (0 to 100 seconds) time to switch on or off selected output.
Time resolution is 5 seconds, 5 steps. During this time if reading value will move towards a set value (on or off) the PWM
will operate the output on timered basis. Reaching the set value the PWM will permanently leave on or off the output.
Parameters to set are:
Unit Value + %: (time activity towards set value. 0% means 0 seconds. 100% means 100 seconds.)
mS range: two pH value between PWM operates.
E.g: set rst value at 2,00 = 00% and second value at 1,50=60%.
For reading values ≥ 2,00 output will always be OFF.
For reading values ≤ 1,50 output will be ON for 60 seconds and OFF for 40 seconds.
If reading value is 1,75 mS the ouput will be ON with a 30% of total set time. (ON for 30 seconds, OFF for 70 seconds).
Proportional Water Meter
Proportional mode can also be set into PROP+WM mode.
This option allows to regulate proportional input based on
flow detected by water meter at set percentual values.
e.g.: reading at 0.09 will have an output of 50 seconds
on and 50 seconds Off (50% on 100 seconds base).
Adding the proportional flow from the water meter with
parameters set between 20 % (at 0mc/h) and 100% (at
8mc/h) results will be that (as example):
At 4 mc/h will have a working period of 30 seconds ON
and 70 seconds OFF (60% of 90P/m)
60% is the middle value between 20% and 100% for
reading of 4mc/h
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