8 Commissioning/Shutdown
116 of 212
PumpDrive 2
NOTE
In the process, the required value must not be defined via an analog input, as the
digital potentiometer will then have no function.
Digital potentiometer in
closed-loop control mode
To incrementally change the closed-loop control setpoint in automatic mode as a
function of the digital inputs, select Potentiometer Auto - and Potentiometer Auto +,
respectively. The Setpoint Change Increment parameter (3-6-6-1) defines by what
value per pulse at the digital input the setpoint for a single-pump and multiple pump
system is increased or decreased.
Digital potentiometer Auto
in open-loop control mode
To incrementally change the open-loop control value in automatic mode as a
function of the digital inputs, select Potentiometer Auto - and Potentiometer Auto +,
respectively. The Speed Change Increment parameter (3-6-6-2) defines by what value
per pulse at the digital input the control value for a single-pump and multiple pump
system is increased or decreased.
Digital potentiometer in
manual mode
To incrementally change the control value in Manual mode as a function of the
digital inputs, select Potentiometer Manual - and Potentiometer Manual +,
respectively. The Speed Change Increment parameter (3-6-6-2) defines by what value
per pulse at the digital input the control value for a single-pump and multiple pump
system is increased or decreased.
NOTE
Requirements for the Digital Potentiometer Manual function must be specified at
every control device, not just at the active master control device.
Behaviour depends on the wiring of the digital inputs:
▪ 00: inactive;
Setpoint or manual-mode control value can be changed via the control panel, for
example.
▪ 01: Up
▪ 10: Down
▪ 11: Disabled;
Setpoint or control value are not changed.
The Interval parameter (3-6-6-3) can be used to set the time value for an
automatic change in value for a continuously present signal. After this time
lapses, the setpoint or control value value changes continuously.
Table86: Digital potentiometer parameters
Parameter Description Possible settings Factory setting
3-6-6-1 Setpoint Change Increment
The parameter defines by what value per
pulse at the digital input the setpoint is
increased or decreased in automatic mode.
Minimum to maximum limit of
value range
0,10
3-6-6-2 Speed Change Increment
The parameter defines by what value per
pulse at the digital input the manual-mode
control value for a single-pump and
multiple pump system is increased or
decreased.
0..1000 rpm 10
3-6-6-3 Interval
Time for automatic change in value for
continuously present signal
0,0…10,0 s 0,5
8.10.1.2 External Message
A local message can be created externally via a digital input.
The Response to External Message parameter (3-9-14-1) can be used to determine
whether the message is an alert or a warning.
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