Introduction; Liam Overview - Caen ELS LiAM 6005 User Manual

Table of Contents

Introduction

This chapter describes the general characteristics and main features of the

LiAM linear bipolar power supply unit.

This power supply system for electromagnets is a compact linear current-

controlled power supply system named LiAM 6005 (LInear Amplifier Module

±60V@±5A).

The unit is designed in order to have true bipolar operation – i.e. real zero-

crossing – that allows smooth transitions around the zero-current level. Low-noise and

high-stability are the main characteristics of these bipolar modules in order to obtain

maximum performances on the relatively-generated magnetic field in the accelerator

facility.

The input ratings of the power supply unit are three-phase 180-220VAC@50-

60Hz, adaptable to either the Japanese or US mains distribution network. Single-phase

versions for the European market are available upon request.

Output current and output voltage values are displayed on a large display

placed on the module front panel. LEDs, also placed on the module front panel, give

indication of the module operational status.

Remote connectivity to LIAM 6005, as for all other CAENels instrumentation,

is guaranteed by means of a standard RJ-45 Ethernet connection (TCP-IP) that allows

to easily control and monitor the functionalities of the power supply unit (current

setting, output current reading and setting, temperature monitoring, etc.).

The "digital" control solution with respect to external analog one gives the

advantages of greatly improved noise immunity: the analog voltage control signals

that come from external DACs are subject to noise pick-up and this effect is greatly

amplified when needing very precise output currents or output voltages.

Easiness of control of large installations is also one of the big advantages of

Ethernet connectivity since everything can be handled from the control system

directly to the modules. Maintenance issues are also easier and faster to carry out with

the fact that the firmware for all the modules can be upgraded remotely.

Accuracy of the output current is also a great advantage of using digital

interface: the calibration of the output current is performed, using a digital third-order

polynomial fit curve, directly on the module itself so that external DACs drifts or non-

LiAM User's Manual

1. Introduction

Table of Contents