Grundfos Pump 300S100-3A

Verify minimum number of starts for MS and MMS motors

Run the pump at least once to prevent issues from prolonged inactivity

Check maximum number of starts for MS402

Check maximum number of starts for MS4000

Check maximum number of starts for MS6000

Check maximum number of starts for MS6000P

Check maximum number of starts for MMS6

Check maximum number of starts for MMS8000

DANGER — Electric shock. Death or serious personal injury.

Switch off the power supply before starting any work on the product.

Ensure the power supply cannot be accidentally switched on.

Measure the voltage between the phases using a voltmeter.

For single-phase motors, measure between phase and neutral or between two phases, depending on the type of supply.

Connect the voltmeter to the terminals in the motor-protective circuit breaker.

Is the voltage within the specified range when the motor is loaded?

Ensure the pump is connected to protective earth

Switch off the power supply before starting any work on the product

Ensure the power supply cannot be accidentally switched on

Start the pump with the outlet valve closed off to approximately 1/3 of its maximum volume of water

Check the direction of rotation as described in the section on Connection of three-phase motors

Are there impurities in the water?

Open the valve gradually as the water becomes clearer

Do not stop the pump until the water is completely clear

Check storage temperature limits

Ensure motors are stored in a closed, dry, and well-ventilated room

Turn the shaft of MMS motors by hand at least once

Is the pump protected from direct sunlight?

Is the pump secured to prevent rolling or falling over?

Motor Protection — Required Settings of Motor-Protective Circuit Breaker

Ensure the motor-protective circuit breaker is set to the rated maximum current of the motor.

Start the pump and let it run for half an hour at normal performance.

Slowly grade down the scale indicator until the motor trip point is reached.

Is the setting within the permissible range?

For star-delta starting, ensure the setting is rated maximum current × 0.58.

Is the startup time for star-delta or autotransformer starting within 2 seconds?