Mycom S CPM 153
6 Start-up
Hauser
53
6.5.12
Set up 2 – Controller settings
Requirements for controller settings:
You have carried out the following settings
which are necessary for controller
configuration
either in the Quick Setup, page 25 or on the appropriate menu page.
If you have not yet made the settings, please do this
before
configuring the controller.
•
Number of relays available to the controller
(Field T18, page 28, or Field F1, page 38) and/or
•
Current output
2
must be defined as an continous controller if you want to control the
actuator via a 20 mA interface
(Field T20, page 29, or Field EA1, page 35).
!
Note!
•
Danger of data loss.
If you assign the relays which are used by the controller with
another function (Field F1, page 38), the
complete
controller configuration is reset to
the default values.
•
If you change the relay assignment for the controller in the Contacts menu (Field F1,
page 38), you must use the controller menu to reassign all the functions selected there
to a relay.
Example: Relays 4 and 5 are assigned to the controller and you change the controller
assignment to relays 5 and 6 (number of relays remains 2)
(
no
data loss, providing the number of assigned relays is not reduced!)
•
Relays 3, 4 and 5 are located on the additional plug-in card. If you have used one of
these relays for the controller function and want/have to remove this card from the
device, then we would recommend that you change the controller settings before
removing the second card, so that all the relays used by the controller are located on
card 1. Otherwise, you cannot use the controller function during the time in which the
additional card is not plugged into the device, as the controller needs to access the
relays on the second card.
Definition of terms
Actuators:
Valves, gate valves, pumps and similar
Acid/alkali:
The terms "acid" and "alkali" used
in the menu
are used here relating to the direction of
action.
Acid
= Dosing medium, which lowers the pH value.
Alkali
= Dosing medium, which raises the pH value.
Example: A fluid (pH value 14) needs to be brought up to the reference value of pH 12
with an alkali (pH value 9). In the "Dosing" menu, choose "Acid" as the addition of this
dosing medium, will lower the pH value of the fluid.
Process:
The controller or the process (to simplify matters this will, from henceforth, be referred
to as the "process") can be differentiated on account of their different features:
Direction of action, one
or two-sided:
One-sided
control only works in one of two directions. This concerns, for example, a
neutralisation process in which a dosing medium is used (acid
or
alkali).
With a
two-sided
process, control can generally working two-directions (use of acid
and
alkali). This means that you can both increase and decrease the value of the actuating
variable (here = pH value). To implement this, the set reference value of your process
must lay between the pH values of the two dosing media.
