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

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 as a parameter to be
measured by the PT100/1000 sensor connected to the actual
Pt100/1000 input. See fig. 40.
1
TT
Fig. 40 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.

13.3 Digital inputs

Function
Select one of the following 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 stops and
indicates a fault. 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 detected, the pump stops.
The pump cannot restart as long as the input is activated.
This requires the use of an accessory, such as one of the
following:
24
function.
2
TT
4 3
DTT
TT
Pos.
1
2
3
Not shown
– 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 pulse per defined volume of water as a feedback signal.
• "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 is
presented in section 16. Priority of
Note: A stop command has always the highest priority.
Activation delay
Select the activation delay (T1) which is the time between the
digital signal and the activation of the selected function.
Range: 0 to 6000 seconds.
Duration timer mode
Select the mode. See fig. 41.
• "Not active"
• "Mode A" - active with interrupt
• "Mode B" - active without interrupt
• "Mode C" - active with after-run.
Select the duration time (T2) which is the time that, together with
the mode, determines how long the selected function will be
active.
Range: 0 to 15,000 seconds.
T input > T1 + T2
T input > T1 + T2
Digital input
T input
T input
Mode A
T1 T2
Mode B
T1 T2
Mode C
T1
Fig. 41 Duration timer function of digital inputs
Factory setting
See section 29. Factory settings.
13.8 Predefined
settings.
T input < T1 + T2
T input < T1 + T2
T input
T input
T1
T1 T2
T2 T1 T2