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User Manual
– Rev M
California Instruments
5.4 System Interface Board
The System Interface Board is located in the top section of the MX15 unit. To access this assembly, the top cover needs to be removed. The System Interface board, A3, receives the oscillator signal from the CPU controller assembly for all phases and passes it through to the amplifier whose gains are controlled by a signal from the over current circuit. The over current circuit senses the RMS value of the current. If the load current exceeds the programmed value, the output of this sensing circuit reduces the amplitude of the oscillator drive signal. The output of the unit then becomes a constant current output, with the output voltage dropping as the load increases.
The System interface also monitors a variety of status signals from the amplifiers. This includes
PFC good, over temperature signals and DC bus regulation good signals. If any status signal is false, the system interface board will shut down the MX. At power on, all status signals have to return good (TRUE) or the MX system power up sequence will be halted.
Finally, the System interface assembly also routes the required system interface bus signals between multiple MX15 chassis for multi-box configurations (MX30/2 and MX45/3). A DB-37 to
DB-37 system interface cable is used to connect two or more MX15 units in a multi-box configuration. Each MX15 provides two sets of system interface connectors on the rear-panel.
One is the master out (unit with CPU controller assembly installed), the other the Auxiliary in.
((unit without CPU controller or with CPU controller disabled.) The CPU controller can be disabled using the internal DIP switch located on the GPIB / RS232C / USB IO assembly.
(Requires removal of the top cover).
5.5 Current / Voltage Sensor Board
The current and voltage sensor board, A4, senses the output current and voltage of the amplifier and feeds this information back to the system interface board. These same signals are also used by the controller for all measurement functions. Voltage sense is accomplished either internally or externally. For best voltage regulation at the EUT, external sense connections should be made using the External Sense terminal block located at the top of the back-panel.
Alternatively, internal sense mode may be selected. In this case, the voltage is sensed at the sensor board.
5.6 Low Voltage Power Supply
The Low Voltage power supply is mounted beside the system interface board in the top section of the MX15 chassis. This assembly generates all required low voltage DC outputs. These outputs from the LV Power supply provide analog and logic power to all the modules. a) +/- 19 V to the System Interface board and power modules. b) + 9 V to the oscillator. c) + 24 V to all contactors and LV cooling fan. d) Isolated + 8 V for the GPIB/RS232/USB board.
Two green LED’s on the system interface board are lit when the ± 15 V and ± 19 V are in regulation. If an overload condition causes the output to drop more than 10% or the output has failed, the corresponding LED will extinguish. This feature is helpful in troubleshooting the unit.
MX15 116
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Table of contents
- 10 Introduction
- 10 General Description
- 10 Manual organization and format
- 11 Specifications
- 11 Electrical
- 19 Mechanical
- 20 Environmental
- 20 Regulatory
- 20 Front Panel Controls
- 21 Special Features and Options
- 29 Supplemental Specifications
- 34 Unpacking and Installation
- 34 Unpacking
- 34 Power Requirements
- 35 Mechanical Installation
- 35 AC Input Connections and Wiring
- 39 AC On/Off Circuit Breaker on MX Series front panel
- 41 Output Connections
- 49 Connectors - Rear Panel
- 57 Multiple Cabinet Power Up/Down Procedures
- 58 Clock and Lock Configurations
- 61 Basic Initial Functional Test
- 63 Remote Inhibit / Remote Shutdown
- 64 Junction Box Accessory
- 65 Output Filter Box Accessory
- 66 Front Panel Operation
- 66 Tour of the Front Panel
- 71 Menu Structure
- 96 Output Programming
- 98 Waveform Management [1Pi Controller only]
- 102 Standard Measurements
- 104 Advanced Measurements [1Pi Controller only]
- 105 Transient Programming
- 111 Principle of Operation
- 111 General
- 111 Overall Description
- 113 Controller Assembly
- 116 System Interface Board
- 116 Current / Voltage Sensor Board
- 116 Low Voltage Power Supply
- 117 Power Module
- 122 Calibration
- 122 Recommended Calibration Equipment
- 123 Front Panel Calibration Screens
- 124 Routine Measurement Calibration
- 126 Routine Output Calibration
- 127 Non-Routine Calibration
- 130 Service
- 130 Cleaning
- 130 General
- 130 Basic operation
- 132 Advanced Troubleshooting
- 134 Factory Assistance
- 135 Fuses
- 135 Firmware Updates
- 138 Top Assembly Replaceable Parts
- 141 Options
- 141 Introduction
- 141 Option -HV: Additional AC Voltage Range
- 142 –160: RTCA/DO-160 Tests
- 156 –704: MilStd704 Tests
- 169 –ABD: Airbus ABD0100.1.8 Test
- 169 –787: Boeing B787-0147 Test
- 170 –WHM: Watt Hour Measurement
- 171 –411: IEC 61000-4-11 Voltage Dips and Interruptions
- 172 –413: IEC 61000-4-13 Interharmonics Test
- 174 –SNK: Current Sink
- 177 . Error Messages
- 182 Index