User Guide

21
In constant curve mode, 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. 31.
Fig. 31 Relation between the actual setpoint and the external
setpoint signal in constant-curve mode
15. 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 the
GRUNDFOS Pump Management System 2000.
Via the bus signal, it is possible to remote-set pump operating
parameters, like setpoint, operating mode, etc. Furthermore, it
offers the possiblity of controlling several E-pumps of the same
type connected in parallel. At the same time, the pump can
provide status information about important parameters, like actual
value of control parameter, input power, fault indications, etc.
Via the bus input, the E-pumps can also be connected to a
building management system or another external control system.
Contact Grundfos for further details.
Note: If a bus signal is used, the number of settings available via
the R100 will be reduced.
16. Priority of settings
The start/stop and digital inputs will influence the number of
possible settings.
By means of the R100, the pump can always be set to max. curve
duty or to stop.
If two or more functions are activated at the same time, the pump
will operate according to the function with the highest priority.
The priority of the settings is as shown in the following tables:
Example: If, via the digital input, the pump has been forced to
operate according to the max. curve, the pump control panel and
the R100 can only set the pump to stop.
Example: If, via the digital input, the pump has been forced to
operate according to the max. curve, the pump control panel, the
R100 and the bus signal can only set the pump to stop.
TM02 8988 1304
0 10 V
0 20 mA
4 20 mA
Actual setpoint
Max. curve
Setpoint set on pump
or with the R100
Min. curve
External setpoint signal
Actual
setpoint
[%]
Without bus signal
Priority
Possible settings
Control panel on
pump or R100
External
signals
1 Stop
2 Max. curve
3 Stop
4 Max.curve
5 Min. curve Min. curve
6 Setting of head Setting of head
With bus signal
Priority
Possible settings
Control
panel on
pump or
R100
External
signals
Bus signal
1 Stop
2 Max. curve
3 Stop Stop
4 Max. curve
5 Min. curve
6 Setting of head
Grundfos.bk Page 21 Thursday, November 11, 2010 11:21 PM