MCC 101 Sine wave filters - Danfoss VLT Drives - #1

Sine-wave Filters reduce motor insulation stress and eliminate switching acoustic noise from the motor. Bearing currents are also reduced, especially in larger motors above 50 kW.

Sine-wave filters prevent disturbing pulses from being transmitted to the motor. Capacitances in screened motor supply cables can otherwise cause high oscillating circuit currents through motor bearings, vaporising lubricant and causing damage to the bearings.

The eddy current losses in the motor can also be minimised in this manner, resulting in a cooler motor and thus extended motor life-time.

Protects the drive In addition to protecting the motor, the sine-wave filter also provides protection for the inverter, because the lower pulse load is reflected in lower semiconductor losses.

It should however be noted that this filter does not operate in common mode and the leakage currents are not reduced, therefore it does not enable the use of unlimited motor cables lengths.

• Compatible with all control prin­ciple including flux and WC+

• Parallel filter installation is possible with applications in the high power range

• Applications with older motors

• Aggressive environments

• Applications with frequent braking

• 690 V applications with general purpose motors

• Motor cable length between 150 and 300 metres

3 x 200 - 500 V, 2.5 - 1,200 A 3 x 525 - 690 V, 13 - 1,320 A

IP00 and IP20 enclosure in entire power range

• Side by side mount with drive up to 75 A

• Filters wall mounted up to 75 A and floor mount above

VIT