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9. 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.
10. 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.
Note
If a bus signal is used, the number of settings
available via the R100 will be reduced.
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
Setpoint setting
Setpoint setting
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
Setpoint
setting
Grundfos.bk Page 19 Tuesday, April 17, 2007 8:54 AM
