Description and function
6
Rivo™ I Controller EN
37
Evoqua Water Technologies GmbH | W3T597263 Issue 01-0624
6.9 Controller outputs
The electronics module supports the activation of various
dosing systems via relay or mA-signal outputs. Slots are
provided for optional expansion with further relays.
The following dosing outputs can be activated:
6.9.1 Positioner (with feedback)
With the selection of the positioner, for example, it is pos-
sible to use chlorine gas dosing in combination with a
positioner as an actuator of a chlorine gas dosing system.
If actuator feedback is present, it must be calibrated
during startup. Potentiometers 1 kOhm/5 kOhm or 0 to 1
V or 0/4 up to 20 mA signals can be connected as actuator
feedback (see Chapter 6.11 Positioner feedback).
Linearization of the actuator via several calibration
points is possible here.
6.9.2 2-point pulse-duration controller for dosing
pumps
The dosing pump is switched on for the calculated time
within an adjustable cycle period TP (relay contact). The
cycle period is mainly determined by the reaction time of
the connected system and entered as the cycle period TP.
Example:
Controller for Type
Parameter
designation
Action
Positioner with
feedback signal
3-point Positioner with
Ym
Dosing
or
Motor dosing
pump (pulse-
duration control-
ler)
2-point
Dosing pump 2p
Solenoid pump
(pulse-frequency
controller)
2-point Solenoid pump
2p
Dosing pump with
mA input
2-point Analog output
2p
Cycle period TP = 100 s Output value Yout = 30%
Duty cycle 30 s Off time 70 s
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