Velocity Edge GX440 Provozní pokyny stáhnout pdf (Strana 332)

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Functions, monitoring, and protective functions

9.3 Drive functions

Drive converter cabinet units

332 Operating Instructions, 10/2008, A5E00288214A

9.3.9 Increasing the output frequency

In applications that require higher output frequencies, the pulse frequency of the converter

may have to be increased.

It may also be necessary to change the pulse frequency to prevent resonance from

occurring.

Since increasing the pulse frequency also increases the switching losses, a derating factor

for the output current must be taken into account when the drive is configured.

Once the pulse frequency has been increased, the new output currents are automatically

included in the calculation for power unit protection.

Note

Use of a sine-wave filter (option L15) must be selected using p0230 = 3 when

commissioning. This setting fixes the pulse frequency to 4 kHz or 2.5 kHz and it cannot be

changed.

The following maximum output frequencies can be achieved with the default pulse

frequencies listed below.

Table 9- 4 Maximum output frequency with default pulse frequency

Converter rating

[kW]

Default pulse frequency

[kHz]

Maximum output frequency

[Hz]

Line voltage 380 – 480 V 3 AC

110 – 250 2 160

315 – 800 1,25 100

Line voltage 500 – 690 V 3 AC

75 – 1200 1,25 100

The pulse frequencies set in the factory are also the minimum frequencies.

The scanning times for the inputs and outputs of the customer terminal block TM31 are set in

the factory to 4000 µs. This is also the minimum limit.

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