26 | BA-40100-02-V17
TOPAX
®
DX
Multichannel controller
8.4 Controller parameters
For Disinfection, pH value, combined chlorine and conductivity inputs the
following settings may be programmed:
Con-
troller
Xp value
Tn value
pH value
P
1 - 500 %
-
PI
1 - 500 %
1 … 200 min
PD
1 - 500 %
1 - 1200 s
PID
1 - 500 %
1 … 200 min
1 - 1200 s
The following control parameters are set by the manufacturer before
shipment:
Controller
Xp
I
D
Disinfection controller
35 %
15 min
OFF
controller pH value
10 %
15 min
OFF
controller combined chlorine
(only article 40100003 a. 40100005)
10 %
OFF
OFF
controller conductivity
(only article 40100004 a. 40100005)
10 %
OFF
OFF
8.5 Control direction
The control direction can be set for each controller.
Possible options:
• increase value
(display "up" arrow)
• decrease value
(display "down" arrow)
• 2-side regulation
(only pH value)
The connection terminals are also marked with an arrow.
8.6 Basic load dosing
Basic load dosing can be configured outside of the control range. This
dosing takes place even if the PID automatic controller output is 0 %.
If a basic load is configured, this value is shown in blue on the display
screen in the Y display. The Y display for automatic control is shown in
green. In the status display, this condition is indicated by a "+" after the
Y display. Note that this basic load is always effective and that a certain
percentage of the actuator is always open irrespective of the control
even though the controller does not require dosing. The basic load can
be adjusted separately for each output up to a maximum of 20 % of the
control range.
8.7 Manual mode
Controllers can be manually adjusted.
If a controller is manually operated, this will be indicated by a large "M"
behind the "Y" in the status displays and the Y display on the screen will
be shown blue. Manual operation is also indicated in the bottom row.
In the manual setting menu the control output can be adjusted directly
to any value between 0 % and 100 % and saved.
ATTENTION!
Manual operation is not reset automatically.
9 Alarms
9.1 Measurement alarms
For each measuring input a minimum and a maximum alarm can be
set. In the case of a value falling above or below this value, the alarm is
shown and an alarm relay as common alarm triggers. The alarm settings
of the relay and the controller for this measuring input can be analysed
separately. The time delay of the alarm is adjustable (delay).
9.2 Safety cutout (Y alarm)
TOPAX DX is equipped with a safety disconnect. If, due to an unforesee-
able event, a sensor fault etc. the controller output power exceeds 95 %
for a programmable period, an alarm is displayed for this controller and
the controller output is set to 0%. This function is activated by default.
The time is adjustable.
An adjusted basic load is also switched off in the event of a safety cutout.
All alarms are displayed in clear text form on the screen. The alarm
relay is activated and the measured value, which caused the alarm, is
shown in red.
ATTENTION!
The alarms are represented in red on the display.
After clearing, acknowledge the alarms by pressing
the OK key twice.
See also chapter “25 Troubleshooting and diagnostics” on page 55.
10 Disturbance variable
Disturbance variable feed-forward is an independent input which has an
effect on the output signal of the controller. This input is an impressed
current signal and can be set as follows:
- Service menu: Configuration: Determine the disturbance variable sig-
nal 0...20 mA or 4...20 mA
- Connection to corresponding terminals: Input board terminal
74 and 75
- Allocation to the respective controller, menu: Controller disinfection or
pH value, input as multiplication factor
Internally, a normal pI controller outputs the calculated output signal as a
control variable. The value of the disturbance variable Z is multiplied with
this output signal Y. This structure ensures that no dosing is performed
with Z = 0 %.
The disturbance variable can be evaluated in a ratio between factor 0.1
and 10. Upon delivery the disturbance variable function is deactivated.
The disturbance variable restricts the maximum output capacity of the
controller. If it is allocated to a controller and activated, the disturbance
variable function must be connected physically to the input terminals of
the TOPAX DX. If the disturbance variable is not connected (0 %), the
controller output power is also 0% and the controller will not work.
The disturbance variable status can be seen in the display: 0 or 4 to
20 mA corresponds to 0 – 100 %.
Example:
Setup factor 2
If the disturbance variable is 42 %, the controller can increase to a
maximum of 84 %.
Setup factor 0.5
If the disturbance variable is 42 %, the controller can increase to a
maximum of 21 %.
11 Analogue power outputs 0/4...20 mA for
remote displays
