AMX AXD-CP4/PB Spécifications télécharger pdf (Page 357)

100

101

Protections Ver: 0002 E - 5

Calculating the I

t implies an ambient temperature of 40°C (104°F). For temperatures of up to

55°C (131°F) (the maximum allowed) and since the driver does not know the actual ambient

temperature, this protection may not be sufficient. In this case and if the operator would use a

cycle which would exceed the derating, it could damage the drive.

As soon as it is possible to vary the frequency of the PWM, the maximum limit of the I

allowed it will adapt automatically in order to consider the losses in the commutations

corresponding to each frequency.

Equivalent duty cycles.

These drives will also admit any other equivalent duty cycle whose rms current is the one

permitted in its derating graph.

The graph below shows an example of two equivalent duty cycles. The integral of the I

t is the

same in both cases even when the integral of the It product is greater in the first case (a).

Time

Current

T T

1 2 ... 352 353 354 355 356 357 358 359 360 361 362 363 364

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AMX AXD-CP4/PB Spécifications Page 357

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