Wilo Pump TOP-S40/4

Check for leaks after installation

Periodically verify all connections remain leak-free during operation

Ensure leakages of hazardous fluids are removed to prevent danger to persons or the environment

8.2 Rotation direction monitoring

Verify the following conditions for three-phase pumps

Briefly switch the pump on to check the direction of rotation

Is the direction of rotation correct (green light)?

Does the motor's direction of rotation correspond to the direction of rotation arrow on the rating plate?

If the direction of rotation is incorrect

Interchange 2 phases in the terminal box

Check that the pump is installed and connected correctly

Ensure the sealing screw and flat gasket are in place

Verify that the pump rotor compartment is vented automatically

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

7.2.3 Frequency converter operation

Verify the use of output filters

Measure the rate of voltage rise (du/dt)

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

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

Measure the minimum voltage at connection terminals (Umin)

Is the minimum voltage at connection terminals compliant (Umin ≥ 150 V)?

Measure the minimum frequency at connection terminals (fmin)

9.1 Dismantling/installation of the motor

Read relevant chapters before maintenance

Comply with safety instructions

Close check valves on both sides of the pump

Allow 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 additives

Comply with national regulations for accident prevention