10.11 Digital inputs
The inputs and outputs available depend on the functional module
fitted in the motor.
Functional
module
Digital input 1
(Terminals DI1, GND)
Digital input 2
(Terminals DI2, GND)
FM310 • •
FM311 • •
Wiring example:
TM083186
Digital input
To set the input, make the settings below:
Function
You can set the inputs to these functions:
• Not active
When set to Not active, the input has no function.
• Ext. stop
When the input is deactivated, open circuit, the motor stops.
• Min. (minimum speed)
When the input is activated, the motor runs at the set minimum
speed.
• Max. (maximum speed)
When the input is activated, the motor 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 motor stops and a fault is
indicated. The function depends on input from external
equipment.
• Alarm resetting
When the input is activated, a fault indication, if any, is reset.
• Dry running
When this function is selected, a lack of inlet pressure or water
shortage (dry running) can be detected. When this happens, the
pump stops. 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.
• Reverse rotation
This function reverses the direction of rotation of the motor.
• Predefined setpoint 1
The function applies only to digital input 2.
When you set digital inputs to a predefined setpoint, the pump
operates according to a setpoint based on a combination of the
activated digital inputs.
• Activate output
When this function is selected, the related digital output is
activated. This is done without any changes to pump operation.
•
Local motor stop
When the function is selected, the given motor in a multimotor
system setup stops without affecting the performance of the
other motors in the system.
The priority of the selected functions are interdependent.
A stop command always has the highest priority.
Activation of digital inputs
You can set the digital inputs to trigger on either Closed contact or
Open contact. Selecting the trigger function can only be set via
Grundfos GO Link.
The digital inputs can be activated either as active low or active
high.
The digital inputs will react as described in the table below:
Activate/
Closed
contact
Deactivate/Open contact
GND/0V Floating/3-24V
42
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