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1.5
Power Section
On the main board, the high current and the signal sections are optically isolated.
Looking at the block diagram (Figure 1-3) the main functions of the drive can be
identified. The power stage DC bus is supplied by the AC line input to the drive and the
internal diode bridge rectifier followed by a set of filtering capacitors. The internal SMPS
(Switching Mode Power Supply) operates off the power DC bus to generate all the
voltages necessary to supply the low power and control electronics.
To dissipate the energy generated by the motor during high gradient deceleration rates
and continuous regeneration against a load, the braking circuit shunts the excess
current generated by the motor through the internal shunt (braking) resistor. The yellow
LED lights when the shunt circuit is active. If the power capacity of the internal braking
resistor is insufficient for heavy cycles, an external braking resistor with greater power
should be added and the internal resistor disconnected. See the "Special Applications"
in Chapter 6 for more information.
Section 1 – Page 10
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