User Guide

ManualsBrandsGrundfos ManualsCirculator PumpsTPE40-240/2 E-Circulator Pump, 1-1/2 HP, Bronze, 208-230V, GF 40/43 Flange Mount

7. External setpoint signal

By connecting an analog signal transmitter to the input for the

setpoint signal (terminal 4), it is possible to remote-set the

setpoint.

The actual external signal (0-10 V, 0-20 mA, 4-20 mA) must be

selected via the R100, see section 5.3.3 Selection of external set-

point signal.

If uncontrolled operation is selected by means of the R100, the

pump can be controlled by any controller.

In controlled-operation mode, the setpoint can be set externally

within the range from the lower value of the sensor measuring

range to the setpoint set on the pump or by means of the R100,

fig. 18.

Fig. 18 Relation between the actual setpoint and the external

setpoint signal in controlled-operation mode

Example: At a lower differential-pressure sensor value of 0 psi, a

setpoint set of 20 psi and an external setpoint of 80%, the actual

setpoint will be as follows:

actual

= (H

set

- H

lower

) x %

external setpoint

+ H

lower

= (20 - 0) x 80% + 0

= 16 psi

In uncontrolled-operation mode, the setpoint can be set exter-

nally within the range from the min. curve to the setpoint set on

the pump or by means of the R100, fig. 19.

Fig. 19 Relation between the actual setpoint and the external

setpoint signal in uncontrolled-operation mode

8. Bus signal

The pump enables serial communication via an RS-485 input.

The communication is carried out according to the Grundfos bus

protocol, GENIbus protocol, and enables connection to a building

management system or another external control system.

Via the bus signal, it is possible to remote-set pump operating

parameters, like setpoint, operating mode, etc. At the same time,

the pump can provide status information about important

parameters, like actual value of control parameter, input power,

fault indications, etc.

Contact Grundfos for further details.

Note: If a bus signal is used, the number of settings available via

the R100 will be reduced.

TM02 8988 1304TM02 8988 1304

0 10 V

0 20 mA

4 20 mA

Actual setpoint

Upper value

of sensor measuring range

Setpoint set on pump

or with the R100

Lower value

of sensor measuring range

External setpoint signal

Actual

setpoint