26
Priority of settings with bus communication
Example:
If the E-pump is operating according to a setpoint set
via bus communication, the control panel or R100 can set the
E-pump to operating mode
Stop
or
Max
, and the external signal
can only set the E-pump to operating mode
Stop
.
11. External forced-control signals
The pump has inputs for external signals for these forced-control
functions:
•
Start/stop of pump
•
Digital function.
11.1 Start/stop input
Functional diagram: Start/stop input:
11.2 Digital input
By means of the R100, one of the following functions can be
selected for the digital input:
•
Normal duty
•
Min. curve
•
Max. curve.
Functional diagram: Input for digital function:
12. External setpoint signal
The setpoint can be remote-set by connecting an analogue signal
transmitter to the input for the setpoint signal (terminal 4).
Fig. 34
Actual setpoint as a product (multiplied value) of
setpoint and external setpoint
Select the actual external signal,
0-10 V
,
0-20 mA
,
4-20 mA,
via
the R100, see section
If control mode
uncontrolled
is selected by means of the R100,
the pump can be controlled by any controller.
In control mode
controlled
, the setpoint can be set externally
within the range from sensor
min
to the setpoint set on the pump or
by means of the R100.
Fig. 35
Relation between the actual setpoint and the external
setpoint signal in control mode controlled
Example:
At a sensor
min
value of 0 m, a setpoint set of 20 m and
an external setpoint of 80 %, the actual setpoint will be as follows:
H
actual
= (H
set
- H
min
) x %
external setpoint
+ H
min
= (20 - 0) x 80 % + 0
= 16 m
In control mode
uncontrolled
, the setpoint can be set externally
within the range from the min. curve to the setpoint set on the
pump or by means of the R100.
Fig. 36
Relation between the actual setpoint and the external
setpoint signal in control mode open loop
Priority
Control panel
or R100
External
signals
Bus
communication
1
Stop
2
Max.
3
Stop
Stop
4
Max.
5
Min.
6
Setpoint setting
Start/stop (terminals 2 and 3)
Normal duty
Stop
Digital function
(terminals 1 and 9)
Normal duty
Min. curve
Max. curve
Q
H
Q
H
Q
H
Q
H
Q
H
TM
03
86
01
20
07
TM
02
89
88
13
04
T
M
02
89
88
13
0
4
Setpoint
External setpoint
Actual setpoint
0
10 V
0
20 mA
4
20 mA
Actual setpoint
Sensor
max
Setpoint set by means of
control panel, R100 or
PC Tool E-products
Sensor
min
External setpoint signal
Actual
setpoint
0
10 V
0
20 mA
4
20 mA
Actual setpoint
Max
curve
Setpoint set by means of
control panel, R100 or
PC Tool E-products
Min
curve
External setpoint signal
Actual
setpoint