English (GB)
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9. External setpoint signal
It is possible to remote-set the setpoint by connecting an analog
signal transmitter to the input for the setpoint signal.
The actual external signal (0.5 - 3.5 V, 0-5 V, 0-10 V, 0-20 mA,
4-20 mA) must be selected with the R100 or Grundfos GO
Remote.
If open-loop operation is selected with the R100 or Grundfos GO
Remote, the motor can be controlled by any controller.
9.1 Closed-loop operation (controlled)
If closed-loop operation is selected, the setpoint can be set
externally within the range from the lower value of the sensor
measuring range to the setpoint set on the motor or with the R100
or Grundfos GO Remote. See fig. 33.
Fig. 33 Relation between the actual setpoint and the external
setpoint signal in controlled-operation mode
Example: At a lower sensor value of 0 bar, a set setpoint of 5 bar
and an external setpoint of 70 %, the actual setpoint is
0.70 x (5 - 0) + 0 = 3.5 bar.
9.2 Open-loop operation (uncontrolled)
If open-loop operation is selected, the setpoint can be set
externally within the range from the min. speed to the setpoint set
on the motor or with the R100 or Grundfos GO Remote.
See fig. 34.
Fig. 34 Relation between the actual setpoint and the external
setpoint signal in uncontrolled-operation mode
Example: At a set setpoint of 65 % of n
max.
and an external
setpoint of 70 %, the actual setpoint is
0.70 x (65 - 12) + 12 = 49 %.
10. Bus signal
The motor enables serial communication via an RS-485 input.
The communication is carried out according to the Grundfos
GENIbus protocol and enables connection to a building
management system or another external control system.
Via a bus signal, it is possible to remote-set motor operating
parameters, such as setpoint and operating mode. At the same
time, the motor can, via the bus, provide status information about
important parameters, such as actual value of control parameter,
input power and fault indications.
Contact Grundfos for further information.
11. Priority of settings
The motor can always be set to operation at max. speed or to
stop with the R100 or Grundfos GO Remote.
If two or more functions are enabled at the same time, the motor
will operate according to the function with the highest priority.
Example: If, via the digital input, the motor has been set to max.
speed, the motor control panel, the R100 or Grundfos GO
Remote can only set the motor to "Manual" or "Stop".
The priority of the settings appears from the table below:
* "Stop" and "Max. speed" settings made with the R100,
Grundfos GO Remote or on the motor control panel can be
overruled by another operating-mode command sent from bus,
for example "Start". If the bus communication is interrupted, the
motor will resume its previous operating mode, for example
"Stop", selected with the R100, Grundfos GO Remote or on the
motor control panel.
TM05 5278 3512TM05 5278 3512
010 V
020 mA
420 mA
0.5 3.5 V
05V
Actual setpoint
Upper value of sensor
measuring range
Setpoint set on motor, with the
R100 or with Grundfos GO
Remote
Lower value of sensor
measuring range
External setpoint signal
Actual
setpoint
010 V
020 mA
420 mA
0.5 3.5 V
05V
% speed
Max. speed
Setpoint set on motor, with the
R100 or with Grundfos GO
Remote
Min. speed
External setpoint signal
Actual
setpoint
If a bus signal is used, the number of settings
available via the R100 or Grundfos GO Remote
will be reduced.
Priority
Start/stop
button
R100,
Grundfos
GO Remote
or control
panel on
motor
Digital
input
Bus
communicat
ion
1 Stop
2 Stop*
3 Manual
4 Max. speed*
5 Stop
6 Stop
7 Max. speed
8 Min. speed
9 Start
10
Max.
speed
11 Min. speed
12 Min. speed
13 Start
14 Start
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