Multipump Or Multimotor Function - Grundfos MGE Serie Montage- Und Betriebsanleitung

Functional module
FM 100 (basic)
FM 200 (standard)
FM 300 (advanced)
The function guides you through the following settings:
• Select date format
• Set date
• Select time format
• Set time.
Related information
2.7 Identification of the functional module
6.28 "Date and time" ("Set date and time")

6.46 Multipump or multimotor function

The Multi-pump function or Multimotor function enables the control of two motors connected in parallel without the use of external
controllers. The pumps or motors in a system communicate with each other via the wireless GENIair connection or the wired GENI connection.
You can set a multipump or multimotor system via the master motor, which is the first selected motor.
If several pumps or motors in the system have sensors, they can all function as the master and take over the master function if the other fails.
This provides additional redundancy in the multimotor system.
You can choose between the following multimotor functions:
Alternating operation
Alternating operation functions as a duty and standby operating mode and is possible with two pumps or two motors of the same size and type
connected in parallel. The main purpose of the function is to ensure an even amount of running hours and to ensure that the other pump or
motor starts if the duty pump or motor stops due to an alarm.
You can choose between two alternating operating modes:
• Alternating operation, time
The change from one pump or motor to the other is based on time.
• Alternating operation, energy
The change from one pump or motor to the other is based on energy consumption.
If the duty pump or motor fails, the other pump or motor starts.
Backup operation
Backup operation is possible with two motors of same size and type connected in parallel. One motor is operating continuously. The backup
motor is operated for a short time each day to prevent seizing up. If the duty motor stops due to a fault, the backup motor starts.
Cascade operation
This function is available with up to 4 motors installed in parallel. The motors must be of the same size and if used with pumps, the pumps
must be of the same model.
• The performance is adjusted to the demand through cutting pumps in or out and through parallel control of the pumps in operation.
• The controller maintains a constant pressure through continuous adjustment of the speed of the pumps.
• Pump changeover is automatic and depends on load, operating hours and fault detection.
• All pumps in operation run at the same speed.
• The number of pumps in operation also depends on the energy consumption of the pumps. If only one pump is required, two pumps will
run at a lower speed if this results in a lower energy consumption.
• If several pumps or motors in the system have a sensor, they can all function as the master and take over the master function if the other
fails.
6.46.1 "Alternating operation, time"
The Alternating operation, time menu sets the interval of alternation between two pumps.
This setting is only available in alternating mode.
6.46.2 "Time for pump changeover"
The Time for pump changeover menu sets the time of day for pump changeover to take place.
This setting is only available in alternating operation.
6.46.3 "Sensor to be used"
This function defines the sensor to be used for controlling the pump system.
Select Master pump sensor if the sensor is placed in a way where it can measure the output from all the pumps in the system, for example in
the manifold.
Select Running pump sensor if the sensor is placed on or across individual pumps. For example if the sensor is installed behind non-return
valves, and if it is not able to measure the output from all pumps.
This setting is only available in alternating operation and cascade operation.
6.46.4 Ways to set a "multi-pump" (multimotor) system
You can set a multimotor or multipump system in the following ways:
• Grundfos GO Remote and wireless motor connection.
• Grundfos GO Remote and wired motor connection.
Setting of date and time
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