Wilo Pump TOP-S80/20

Verify terminal box type and corresponding protection mechanism

Is the thermal tripping setting corresponding to the maximum current of the speed stage?

Is the Wilo tripping unit SK 602(N)/SK 622(N) present?

Is the thermal winding contact (WSK) connected to a motor protection system?

Check if the motor has cooled down before resetting

Reset the motor protection system if necessary

8.2 Rotation direction monitoring

Verify the following conditions for three-phase pumps

Is the direction of rotation light green when the pump is briefly switched on?

If the direction of rotation is incorrect, was the pump electrically isolated and two phases interchanged in the terminal box before restarting?

Verify the use of output filters

Check the type of filters used for noise reduction

Measure the rate of voltage rise (du/dt)

Is the rate of voltage rise within the limit (du/dt < 500 V/μs)?

Are the voltage spikes within the limit (û < 650 V)?

Measure the minimum voltage at connection terminals (Umin)

Verify installation and connection

Is the sealing screw including the flat gasket in place?

Prime and vent the unit correctly

Is the pump rotor compartment vented automatically after a short operating period?

Is dry running for short periods acceptable?

Ensure motor head, differential pressure screw, and flange connection/threaded pipe union are not removed for venting

9.1 Dismantling/installation of the motor

Read the chapters 'Dismantling/installation of the motor' and 'Decommissioning' before maintenance

Comply with safety instructions in chapters 2.6, 7, and 8

Close existing check valves on both sides of the pump

Allow the pump to cool to room temperature

Drain the isolated branch of the system

Drain the entire system if no check valves are fitted

Observe manufacturer's information and safety data sheets on possible additives