18. Add-on volume based dosing
94
Dr. A. Kuntze
I
Gutes Wasser mit System
Robert-Bosch-Str. 7a
40668 Meerbusch
+49 (0) 2150-7066-0 / Fax -60
www.kuntze.com
18.2. Configuration of the dosing relay
In the DOSAGE menu select the symbol DOS.RELAY.
R1 on/off
If you do not want to use the relay as
controller output, you can switch it off
completely.
Relay 1 contact
Relay 1 is a normally open contact. In
the menu you can invert it so that it is
actively closed. If you select NC (nor-
mally closed contact) the relay will
open to dose and close to pause.
Note
To use an analog output as controller output you have to enter the mA menu
in the IN/OUT menu and assign the mA output to control variable S1 or S2,
respectively – see chapter analog output.
Warning
If you invert the relay you must take precautions that the dosing is stopped
in case of power interrupt! If the instrument does not get power, the relay will
open, sending dosing pulses to the pump!
Pulse type
The controller output via the relay can be realized in two ways: via time frames in which the relay is
part-time ON and OFF (pulse-pause type), or via the switching frequency (pulse-frequency type).
Pulse min (only for pulse type = pulse pause)
Define a minimum pulse, i.e. the minimum time the relay has to be on to allow the actuator to react.
Pulse pause (only for pulse type = pulse pause)
For a pulse-pause controller define as Pulse-Pause time a time-frame in which the relay is on (pulse)
and off (pause) according to the control variable.
Note
The pulse-pause time must be at least twice as long as the minimum pulse.
