Principle Of Operation; General; Overall Description; Figure 5-1: Mx Series Functional Block Diagram - California Instruments MX30-1 User Manual

User Manual – Rev AJ
5.

Principle of Operation

5.1 General

An explanation of the circuits in the MX 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 MX-45-1 single-phase output unit. Other models have slightly different output
configurations.
K1/K2 Main
Fuse
Contactor
AC
Block
& soft start
Input
Main
CB
LV
Supply
Keyboard /
Display
Gnd

5.2 Overall Description

Three-phase input power is routed from the back of the cabinet to a fuse holder terminal block
located in the bottom front of the unit. The lower front 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 three-phase output secondaries are provided by the
transformer to produce three 140 VAC unregulated output AC buses. Each of these outputs is
fed into one of the power modules. (A, B and C) The power modules can be individually
removed although for most configurations, all three are required. The power modules are
located in the middle of the MX chassis and can be pulled out from the front after removing the
top access panel and disconnecting the power input and output wiring.
144
Input
Transformer
AC 3ø
MODULE B
POWER
MODULE C
System
Interface
Board
Controller
CPU / Phase A
Controller
Phase B & C

Figure 5-1: MX Series Functional Block Diagram

POWER
MODULE A
Current
POWER
Voltage
Sense
Board
Ext I/O
Remote
Interface
IEEE-488 RS232C
California Instruments
Output
Terminals
A
Range
B
Mode
C
Select
N
Ext.
Sense
MX Series