11 Current Limitation
The current range specifies the maximum admissible currents. Distinction is made be-
tween peak and rated current:
▶ The peak current is only admissible for a short time (mostly 5 seconds) and de-
pends on the used transistors and their number.
▶ The rated current can be provided continuously by the output stage. Its value de-
pends on the cooling of the transistors, that means: the capacity of the used heat
sink and its ventilation.
▶ Due to the higher load of the power semiconductors in the output stage during a sta-
tic rotating field or low rotating field frequencies (f ≤ 5 Hz) the rated current will be
reduced by the factor √2 within this frequency range for the SIEB & MEYER devices
of the series SD2, SD2S and SD2T.
For devices of the series SD2M the current will be limited at rotating field frequen-
cies < ƒ
derating
according to the following figure.
Fig. 54: Current limitation for SD2M
Fig. 54: Current limitation for SD2M
99Drive System SD2M - Hardware Description 036228xxF
Current Limitation
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