Principle Of Operation; General; Overall Description; Figure 5-1: Mx Series Functional Block Diagram - Ametek California Instruments MX15 Series User Manual

Ac and dc power source

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5 Principle of Operation

An explanation of the circuits in the MX15 Series is given in this section. Refer to Figure 5-1 for

a basic functional block diagram of the system. Figure 5-2 shows a more detailed system

interconnect for a MX15-1 single-phase output unit.

Three-phase input power is routed to the back of the cabinet to a fuse holder terminal block. The

rear access panel has to be removed to gain access to the AC input connection fuse block.

From the fuse block, the AC input is connected to the three-phase input transformer primary.

The input transformer provides the required isolation between input and output of the MX and

accommodates various input voltage ranges by employing multiple taps. Three sets of single-

phase output secondaries are provided by the transformer to produce three 140 VAC

unregulated output AC buses. Each of these outputs is fed into the power module. The power

module is located in the middle of the MX chassis and can be pulled out from the front after

removing the front access panel and disconnecting the power input and output wiring.

The power module contains a three-phase PFC power input module. The PFC module acts as a

boost converter using a PWM converter topology to generate a 450 VDC regulated bus. A bank

MX15 Series

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