700 P electronics module
Description
3.
17
2-point pulse frequency
controller for pulse pumps
Pulse pumps are controlled with 0 to 100/120/140/160/180 pulses
per minute, depending on the specification of the connected pump.
The duty cycle during each dosing is 0.3 s. The break time is cal-
culated to be between 0.2 and 60 s, depending on the dosing rate.
Example of a pulse pump at 120 pulses/min:
3-point pulse duration controller
for dosing pump and 3-point
pulse frequency controller for
Pulse pump
Pump 1 decreases the control value,
Pump 2 increases the control value.
The control range is between -100 % (Pump 1) and +100 % (Pump
2); this range can also be set in manual mode.
If the setpoint = actual value, no pump is activated (neutral zone
Xsh).
Output signals as for 2 point pulse-duration controller and 2-point
pulse-frequency controller.
Controller with mA output
The 700 P electronics module has a maximum of four analog mA
outputs. These can be assigned individually as registration or con-
troller outputs or as controller output when selecting “Analog out-
put 2P” or “Analog output 3P” it is necessary to assign the desired
mA output 1 to 4.
Analog output controller 2-point
With a control output of 0%, the output current is 0 or 4 mA; with a
higher control output, the output current reaches up to 20 mA.
Pumps with current input, thyristor control units with DC or AC
pumps, or analog control valves can be used as actuators.
Analog output controller 3-point
Pump 1 decreases the control value,
Pump 2 increases the control value.
Output behaviour is similar to "Analog output controller (2-point)",
but with 50 % offset. This means that with a control deviation of 0
% (setpoint = actual value) a current of 10 mA or 12 mA is output
(pump is idle).
Therefore, two suitable pumps can be actuated with one mA cur-
rent loop.
Off-duty cycle
70 s
Yout in %
100... 84...
72... 56
50...
33...
25...
10...
5...
1
0
Pulses/min
120...
96...
85...
75
60...
40... 30...
12...
6...
1
0
Setting
Signal
Pump
Signal
Pump
0 to 20 mA
0 to 10 mA
Pump 1
10 to 20 mA
Pump 2
4 to 20 mA
4 to 12 mA
Pump 1
12 to 20 mA
Pump 2
Содержание WALLACE & TIERNAN 700 P
Страница 1: ...WALLACE TIERNAN ELECTRONICS MODULE 700 P Version 1 31 and later INSTRUCTION MANUAL...
Страница 2: ...2 WT 050 810 010 DE IM 0718 700 P electronics module Please note Original instruction manual Simone...
Страница 135: ...700 P electronics module Retrofit kits and spare parts 8 135 Explosion drawing 700 P electronics module...
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Страница 139: ...700 P electronics module Wiring Diagrams 9 139 9 Wiring Diagrams...
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Страница 145: ...700 P electronics module Declarations and certificates 10 145 10 2 Certificate of Compliance...
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