ETATRON D.S. eSelect M 1 pH (Rx) Скачать руководство пользователя страница 50

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MIN Active Time: programmable. Defines the minimum time for which PWM is active; prevails over the selected
settings. The pulse modulation function is adjusted with 3 functions according to the following formula: Active
Time in accordance with the selected formula = (measured value - setpoint) / (period width * cycle time). If the
result of the formula is < of that selected with MIN Active Time, the latter prevails on the former.

PWM PROPORTIONAL MODE FOR RX WITH TIMED PULSES

Pulse width: pulses are timed ON and OFF based on the distance from the selected setpoint (programmable),
example: if the selected setpoint is 750 mV and the measured value is 500 mV, the PWM mode starts after
reaching 550 mV with Time/Pause pulses and decreasing the active time while reaching the setpoint.

Cycle Time: the PWM mode has a 60 second cycle (programmable), example: setpoint is 700 mV, measured
value 550 mV = active time 60 sec - pause time = 0 sec; at 625 mV active time = 30 sec - pause time = 30
sec… as a consequence the active time decreases while reaching the setpoint. The cycle time depends on
many variables, such as: distance from the injection point of the system to be treated, how fast or slowly the
setpoint must react, chemical concentration, etc.

MIN Active Time: programmable. Defines the minimum time for which PWM is active; prevails over the
selected settings. The pulse modulation function is adjusted with 3 functions according to the following formula:
Active Time in accordance with the selected formula = (measured value - setpoint) / (period width * cycle time).
If the result of the formula is < of that selected with MIN Active Time, the latter prevails on the former.

BY SELECTING

“ON-OFF”

THE NEXT PROGRAMMING STEPS AS FOLLOWS ……

FUNCTION NOT AVAILABLE WITH PROPORTIONAL MODE

Hysteresis is useful during operations to adjust the setpoints in ON-OFF
mode and is used to enable or disable the output relay when the selected
hysteresis has been achieved. Hysteresis is useful when there are too many
quick swings around the setpoint, that might damage the connected device.

FUNCTION NOT AVAILABLE WITH PROPORTIONAL MODE

The Delay time blocks the output relays (max 999 sec. programmable) to ensure the outputs are active only
when measurements are stable, thus assuring the best results in terms of chemical balance.

* GOING BACK TO THE SETPOINT PROGRAMMING STEPS FROM THE

“ON-OFF”

MODE OR

“PROPORTIONAL”

MODE

The PH measurement parameter may be changed into RX by simple
programming and using the RX electrode

In the MIN Alarm function a MINIMUM alarm level is set up, after which the
alarm relay is triggered.
In the MAX Alarm function a MAXIMUM alarm level is selected, after which
the alarm relay is triggered.

MENU SETPOINT 1 (pH)

Min.Active Time

5 sec

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EXPERT MENU

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MENU SETPOINT 1 (Rx)

Window width

150 mV

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EXPERT MENU

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