Digital Inputs - Grundfos MGE Serie Montage- Und Betriebsanleitung

Sensor function/measured parameter
Liquid temp.
Temperature 1
Temperature 2
Ambient temp.
Measuring range
-50 to +204 °C

6.8 "Digital inputs"

The inputs and outputs available depend on the functional module fitted in the motor.
Functional module
FM 100 (basic)
FM 200 (standard)
FM 300 (advanced)
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, 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.
Digital input 1
(Terminals 2, GND)
•
•
•
Pos.
1
2
3
Not shown
Digital input 2
(Terminals 1, GND)
-
-
•
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