CAMAC C151 - Dual 14-bit Power Supply Controller

J. Simanton

Table Of Contents

^General Description

This single-width module independently controls two magnet power supplies (per NAL standard No. SD-32 for analog referenced supplies). Two readable, writeable registers present 14 bits of input data to two multiplying D/A converters. Reference voltage for each D/A is independently software selectable from either an internal, fixed, 10.24V reference (For stand-alone DC mode operation) or from an external, fixed or variable voltage (such as provided by the CAMAC 150 Function Generator Module) for individual software-scaled, analog-mode operation.

Other provisions: four power supply digital control commands; also eight bits of status are monitored for each supply.

^CAMAC Commands

C151 CAMAC Commands
F(0)A(0)Read P.S. #1 Register
F(0)A(1)Read P.S. #2 Register
F(1)A(0)Read 8 status bits for P.S. #1
F(1)A(1)Read 8 status bits for P.S. #2
F(6)A(0)Read module number
F(9)A(0)Clears Data registers
Clears polarity commands
F(12)A(0)Reset P.S. #1
F(12)A(1)Reset P.S. #2
F(16)A(0)Load D/A input data into register #1
F(16)A(1)Load D/A input data into register #2
F(17)A(0)Load polarity data into bit 17 of register #1
F(17)A(1)Load polarity data into bit 17 of register #2
F(24)A(0)Connects D/A #1 to internal fixed voltage reference and clears its input register
F(24)A(1)Connects D/A #2 to internal fixed voltage reference and clears its input register
F(26)A(0)Connects D/A #1 to external voltage reference and clears its input register
F(26)A(1)Connects D/A #2 to external voltage reference and clears its input register
F(28)A(0)Sets P.S. #1 OFF
F(28)A(1)Sets P.S. #2 OFF
F(30)A(0)Sets P.S. #1 ON and clears its input register
F(30)A(1)Sets P.S. #2 ON and clears its input register

^Analog Control

The analog output is a 0 to 10.239V signal

There are two modes of analog control: INTERNAL REFERENCE and EXTERNAL REFERENCE, individually selectable by software

INTERNAL Reference Mode

For this mode the output is referenced to an internal 10.24V reference, and is a DC voltage. The command which selects this mode also resets the digital input register (hence the output voltage) to zero. The output voltage is then adjusted by writing the input register.

EXTERNAL Reference Mode

For this mode, the output is referenced to an external voltage source, either DC or varying analog (of 10.239V or less). The command which selects this mode for a power supply also resets the respective input register (hence the initial output voltage to zero.

Typically EXTERNAL mode is used to selectively slave the analog of one or both 151 module channels to some voltage-vs-time function generated by the CAMAC 150 module. Usually several 151 modules are daisy-chained to a 150 module OUT LEMO via 151 front panel EXTERNAL REFERENCE IN, OUT LEMOS. 151 output voltages are then individually adjusted to become finely scaled (14 bits) amplitude replicas of the 150 module output.

^Digital Control

Eight (4 for each power supply) isolated relay contacts are used for ON, OFF, RESET, and POLARITY control functions. The ON and RESET signals are momentary relay closures of 100 milliseconds duration. The OFF signal is a momentary 100 millisecond contact opening. POLARITY is a sustained contact state (open or closed).

^Digital Status

The module reads (monitors) up to 16 status points (8 for each power supply). Status must be presented at the 151 module VIKING I/O connector as (open or closed) floating relay contacts.

^Front Panel

C151 Front Panel Lights and LEMOs
Module Select (N) LightRed LEDFlashes whenever module is addressed
EXTERNAL REFERENCE IN,OUT2 PIN LEMODual contact connectors for daisy-chaining to external voltage via shielded, twisted pair cable.
P.S. 1 REFERENCE LightRed/Green LEDWhen light is green, P.S. #1 is in internal mode (for DC operation), Red light signifies P.S. #1 is slaved to an external reference.
P.S. 2 REFERENCE LightRed/Green LEDIndicates the above for P.S. #2.

^I/O Connector

This modules uses a 36 pin card edge connector. Signals on pins of viking connector are listed below. The left and right pins are wired respectively to left and right I/O cables. Each cable contains all connections for one power supply.
C151 I/O Connections
1LPS #2 Analog out (negative)1RP.S. #1 Analog out (negative)
2LPS #2 Analog out (positive)2RP.S. #1 Analog out (positive)
3LPS #2 ON3RP.S. #1 ON
4LPS #2 ON4RP.S. #1 ON
5LPS #2 OFF5RP.S. #1 OFF
6LPS #2 OFF6RP.S. #1 OFF
11LPS #2 Status bit 111RP.S. #1 Status bit 1
12LPS #2 Status bit 212RP.S. #1 Status bit 2
13LPS #2 Status bit 313RP.S. #1 Status bit 3
14LPS #2 Status bit 414RP.S. #1 Status bit 4
15LPS #2 Status bit 515RP.S. #1 Status bit 5
16LPS #2 Status bit 616RP.S. #1 Status bit 6
17LPS #2 Status bit 717RP.S. #1 Status bit 7
18LPS #2 Status bit 818RP.S. #1 Status bit 8

A ground connection is made using a ring terminal connected to one of the I/O screws.

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