Pt100/1000 Inputs; Digital Inputs - Grundfos Hydro Multi-E Series Installation And Operating Instructions Manual

13.1.1 Setting two sensors for differential measurement
In order to measure the difference of a parameter between two
points, set the corresponding sensors as follows:
Analog input for
Parameter
sensor 1
Differential
Pressure, option 1
pressure, inlet
Pressure 1,
Pressure, option 2
external
Flow Pump flow
Temperature Temperature 1
If you want to use the control mode "constant
differential pressure", you must choose the function
"Feedback sensor" for the analog input of both
sensors.

13.2 Pt100/1000 inputs

Function
The Pt100/1000 inputs can be set to these functions:
• "Not active"
• "Feedback sensor"
The sensor is used for the selected control mode.
• "Ext. setpoint infl."
See section 13.7 External setpoint
• "Other function."
Measured parameter
Select one of the parameters listed below, meaning the
parameter to be measured in the system by the PT100/1000
sensor connected to the actual PT100/1000 input. See fig. 46.
1
TT
Fig. 46 Overview of PT100/1000 sensor locations
Parameter
"Liquid temp."
"Temperature 1"
"Temperature 2"
"Ambient temp."
Measuring range
-50 to 204 °C.
Factory setting
See section 29. Factory settings.
26
Analog input for
sensor 2
Differential
pressure, outlet
Pressure 2,
external
Flow, external
Temperature 2
function.
2
TT
4 3
DTT
TT
Pos.
1
2
3
Not shown

13.3 Digital inputs

Function
Select one of these functions:
• "Not active".
When set to "Not active", the input has no function.
• "External stop".
When the input is deactivated (open circuit), the pump stops.
• "Min." (minimum speed).
When the input is activated, the pump runs at the set minimum
speed.
• "Max." (maximum speed).
When the input is activated, the pump runs at the set
maximum speed.
• "User-defined speed"
When the input is activated, the motor runs at a speed set by
the user.
• "External fault."
When the input is activated, a timer is started. If the input is
activated for more than 5 seconds, the pump is stopped and a
fault is indicated. This function depends on input from external
equipment.
• "Alarm resetting."
When the input is activated, a possible fault indication is reset.
• "Dry running."
When this function is selected, lack of inlet pressure or water
shortage can be detected. When lack of inlet pressure or
water shortage (dry running) is detected, the pump is stopped.
The pump cannot restart as long as the input is activated.
This requires the use of an accessory, such as these:
– a pressure switch installed on the inlet side of the pump
– a float switch installed on the inlet side of the pump.
• "Accumulated flow."
When this function is selected, the accumulated flow can be
registered. This requires the use of a flowmeter which can give
a feedback signal as a pulse per defined volume of water.
• "Predefined setpoint digit 1" (applies only to digital input 2).
When digital inputs are set to predefined setpoint, the pump
operates according to a setpoint based on the combination of
the activated digital inputs. See section
setpoints".
The priority of the selected functions in relation to each other
appears from section 16. Priority of
A stop command has always the highest priority.
13.8 "Predefined
settings.