9.12 Digital inputs
The inputs and outputs available depend on the
functional module fitted in the motor.
Functiona
l module
Digital input 1
(Terminals DI1,
GND)
Digital input 2
(Terminals DI2,
GND)
FM110 • -
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
9.12.1 Timer function for a digital input
Activation delay
The activation delay (T1) is the time between the
digital signal and the activation of the selected
function.
Range: 0-6000 seconds.
Duration time
Available modes:
• Not active
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