Technical Information Manual
Revision n. 5 10 February 2003
MOD. A 1520P series CMS ECAL PWS BOARD
NPO: 00110/99:ECAL.MUTx/05 CAEN will repair or replace any product within the guarantee period if the Guarantor declares that the product is defective due to workmanship or materials and has not been caused by mishandling, negligence on behalf of the User, accident or any abnormal conditions or operations.
CAEN declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User. It is strongly recommended to read thoroughly the CAEN User's Manual before any kind of operation.
CAEN reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice. PRELIMINARY Document type: Title: Revision date: Revision: User's Manual (MUT) Mod. A 1520P, CMS ECAL PWS Board 37662.29 5
TABLE OF CONTENTS
1. INTRODUCTION...... 5
1.1 THE CAEN UNIVERSAL MULTICHANNEL POWER SUPPLY SYSTEM...... 5
1.2 TECHNICAL SPECIFICATIONS TABLE OF THE SY 1527 SYSTEM...... 7
2. MOD. A 1520P HIGH VOLTAGE BOARD...... 8
2.1 OVERVIEW...... 8
2.2 FUNCTIONAL DESCRIPTION...... 8
2.3 CHANNEL CHARACTERISTICS TABLE...... 9
2.4 FRONT PANEL...... 10
2.5 TECHNICAL SPECIFICATIONS...... 12 2.5.1 Packaging...... 12 2.5.2 External connections...... 12 2.5.3 Cabling...... 15 2.5.4 Displays...... 18 2.5.5 Other components...... 18
3. SAFETY INFORMATION AND INSTALLATION REQUIREMENTS...... 19
3.1 GENERAL SAFETY INFORMATION...... 19 3.1.1 Injury Precautions...... 19
3.2 SAFETY TERMS AND SYMBOLS ON THE PRODUCT...... 20
3.3 INSTALLATION...... 20
4. OPERATING MODES...... 21
4.1 OUTPUT CONTROL AND MONITORING...... 21
4.2 VOLTAGE SENSING...... 22
4.3 INTERLOCK...... 22
4.4 TEMPERATURE DRIFT COMPENSATION...... 23
4.5 IMON OFFSET NULLING...... 23
4.6 TRANSPARENT MODE ACCESS...... 23
5. T1520 P VOLTMETER BOARD...... 24
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LIST OF FIGURES
FIG. 2.1 – MOD. A1520 P FRONT PANEL...... 10
FIG. 2.2 – MOD. A1520 PE FRONT PANEL...... 11
FIG. 2.3 – CHANNEL CONNECTOR PARTS...... 16
FIG. 2.4 – CABLE CONNECTOR PARTS...... 17
FIG. 2.5 – INTERLOCK JUMPERS LOCATION...... 18
FIG. 4.1 – REMOTE VOLTAGE SENSING SCHEME...... 22
FIG. 4.2 – INTERLOCK CONNECTIONS SCHEME...... 23
FIG. 5.1 – MOD. T1520 P JUMPERS GROUP (1 CHANNEL)...... 24
FIG. 5.2 – MOD. T1520 P JUMPERS POSITION...... 24
LIST OF TABLES
TABLE 1.1 – TECHNICAL SPECIFICATIONS OF THE SY 1527 MAINFRAME: GENERAL...... 7
TABLE 2.1 – CHANNEL CHARACTERISTICS OF THE MOD. A 1520P HV PWS BOARD...... 9
TABLE 2.2 – MEASURED RATINGS OF THE MOD. A 1520P HV PWS BOARD...... 9
TABLE 2.3 – MOD. A1520 P HVOUTPUT CONNECTOR PIN-OUT...... 12
TABLE 2.4 – MOD. A1520 PE HVOUTPUT CONNECTOR PIN-OUT...... 14
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1. Introduction
1.1 The CAEN Universal Multichannel Power Supply System
The SY 1527 system is the fully equipped, large scale experiment version of a new line of power supply systems which represent CAEN's latest proposal in the matter of High Voltage and Low Voltage Power Supplying. This system outlines a completely new approach to power generation and distribution by allowing to house, in the same mainframe, a wide range of boards with different functions, such as High/Low Voltage boards, generic I/O boards (temperature, pressure monitors, etc.) and branch controllers, where the latter are used to control other remote generators and distributors.
Modularity, flexibility and reliability are the key-points of its design, enabling this module to meet the requirements of a wide range of experimental conditions. The latter range from those of LHC experiments, in which the features of this model find prior application, to those of other less challenging, but still demanding, High Energy Physics experiments.
The mainframe is housed in a 19"-wide, 8U-high euro-mechanics rack and hosts four main sections: - the Board Section, with 16 slots to house boards, distributors and branch controllers; - the Fan Tray Section, housing 6 fans disposed on two rows; - the Power Supply Section, which consists of the primary power supply and up to 3 power supply units; - the CPU and Front Panel Section which includes all interface facilities.
The User interface features the usual friendliness of the previous CAEN systems which now also includes a 7.7" colour LCD. A wide choice of interface facilities provides full communication compatibility with the previous systems and the possibility of controlling heterogeneous external devices.
Modularity has been one of the leading criteria in the design and development of the system: both the Power Supply Section and the Board Section are completely modular. The Power Supply Section allows different configurations with up to 3 power supply units per mainframe (up to 2250 W), while the Board Section can house up to 16 boards able to fulfil different functions. A new line of boards and distributors, analogous with those available for the SY527 system, and a set of branch controllers has been specially developed for this new system. The minimum system configuration consists of the primary power supply, one Power Supply Unit and one board. The concept of modularity has been extended up to the possibility of arranging ‘clusters’ constituted by one ‘intelligent’ SY1527 system able to drive other ‘non-intelligent’ systems, i.e. systems without CPU (to be implemented). The connections among the systems constituting the cluster are realised through a new CAEN interface, the Local Net.
The extreme flexibility of the system, which allows to house indifferently, inside the same mainframe, boards with different functions, is further enhanced by the possibility of developing ad-hoc boards and even complete custom peripheral systems. The latter, actually, can be designed specifically for on-detector installation. All the custom
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electronics can be anyway remotely controlled by single boards which are inserted in the SY 1527 mainframe and act as branch controllers.
Fast, accurate set-up and monitoring of system parameters (14-bit resolution on Voltages and Currents with standard boards) is available for each branch controller thanks to the use of one microprocessor per slot. All the operational parameters are stored in a non- volatile memory (EEPROM) to be still available after Power-Off. The parameters can be controlled either via CAEN traditional built-in links (RS232, H.S. CAENET) or via CERN- approved Fieldbuses or via Ethernet (TCP/IP). Programmable handling of parameters and errors is available as well.
Channel trip control on other crates is performed via four external differential trip lines. A sophisticated trip handling via software allows to control and correlate trip conditions on the channels of the crate as well as of other crates connected to it.
Live insertion and extraction of the boards, which reduces the down time of the global system, and easy access to the computing core and peripherals of the system completes the system flexibility.
Easy interfacing is another key-point of the SY1527 system. Thanks to the H.S. CAENET interface, the system ensures full communication compatibility with the previous models. Besides the RS232 interface and Ethernet (TCP/IP) provided with the standard version of the system, CAN-bus can be furnished on request, as well as special boards featuring optical links for remote communications. Enhanced software programming features a unified command set independent from the interface used to communicate with the system. The Power Supply Section and Board Section can be externally synchronised via front panel connectors.
Secure access to the system via Intranet is foreseen together with a multilevel management of custom User's profiles. In particular, three different access levels have been implemented: Guest, User and Administrator, each of which with password protection.
Handy maintenance and upgrading, which constitute a major issue in the reliability of a system, are further guaranteed by the possibility of accessing and servicing the system via network facilities. Actually, Telnet and WWW access facilities allow remote debugging and technical support of the system, including future firmware upgrading.
For a detailed description of the SY 1527 Universal Multichannel Power Supply System please refer to the SY 1527 User's Manual .
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1.2 Technical Specifications Table of the SY 1527 system
Table 1.1 – Technical specifications of the SY 1527 mainframe: general
- 19"-wide, 8U-high Euro-mechanics rack; Packaging - Depth: 720 mm.
- Mainframe (*): 24 kg Weight - Mod. A1532: 3.2 kg
Monophase: 88264 V a.c., 4864 Hz; 38 A Power requirements Three-phase (on request)
Max. number of boards per crate 16
Max. number of power supply 3 units per crate
Primary power supply output +/-12 V, 8 A (A 1531) +5 V, 20 A Power supply unit output +48 V, 15.6 A (A 1532) Max. output power 2250 W
Operating temperature From 5°C (dry atmosphere) to 40°C
Storage temperature From - 20°C (dry atmosphere) to 50°C
(*) One Primary Power Supply (Mod.A1531) and one Power Supply Unit (Mod.A1532) are included; boards are not included.
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2. Mod. A 1520P High Voltage Board
2.1 Overview
The Mod. A1520 P has been specially designed to meet the strict performance requirements for powering the APDs of CMS ECAL; thanks to a careful layout and the use of selected components, 20 mV voltage regulation stability, less than 20 mV pp noise and 1 ppm/°C thermal stability has been achieved.
2.2 Functional description
The Model A1520 P1 is a SY1527 System double-width board which houses 12 positive HV channels; each output channel has an independent floating ground. The output voltage can be programmed and monitored in the range 0 +500 V with 16 bit resolution (10 mV steps). If the output voltage differs from the programmed value by more than 15 V, the channel is signalled to be either in OVERVOLTAGE or UNDERVOLTAGE condition. Moreover, for each channel, a voltage protection limit SVMAX can be fixed via software with 1 V resolution and the output voltage can not be programmed beyond this value. All output channels are provided with Remote Sensing Lines to compensate for the voltage drop over the cables.
The HV RAMP-UP and RAMP-DOWN rates may be selected independently for each channel in the range 1 50 V/s in 1 V/s steps.
For each channel, it is also possible to set an output current limit in the range 0 15 mA (25 nA steps). The output current is monitored with 25 nA resolution; if a channel tries to draw a current larger than its programmed limit it is signalled to be in OVERCURRENT condition; the SY 1527 system detects this state as a fault and reacts according to the setting of the TRIP parameter, namely:
1) TRIP=infinite ( = 1000 s)
If the maximum output current value is reached the channel behaves like a constant current generator.
2) TRIP=finite (< 1000 s)
The output current is permitted to equal the limit value only for programmed time interval and then is switched off at the selected RAMP-DOWN speed. The TRIP time (i.e. the maximum time an OVERCURRENT condition is allowed to last) can be programmed in 0.1 s steps. If a RESET, INTERLOCK or KILL command is issued to the board, all channels are switched off at the selected RAMP-DOWN speed.
1 The board version which actually supplies the APDs of CMS ECAL features 9 channels instead of 12 and is encoded as A1520 PE. Such issue shares all the other functional characteristics with the standard A1520 P.
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2.3 Channel Characteristics Table
Table 2.1 – Channel characteristics of the Mod. A 1520P HV PWS Board
Polarity: Positive
Output Voltage: 0 ¸ 500 V
Max. Output Current: 15 mA
Voltage Set/Monitor resolution: Set: 10 mV; Monitor: 1 mV
Current Set/Monitor resolution: 25 nA
SVMAX limit: 0¸500 V, 1 V steps
Ramp Up / Ramp Down rate: 1¸50 Volt/sec, 1 Volt/sec steps
Temperature Monitor resolution: 1 °C
Temperature range: +15 +40°C
Table 2.2 – Measured ratings of the Mod. A 1520P HV PWS Board
Low frequency noise (f < 100 kHz): 20 mV pp
High frequency noise (f 100 kHz) 4 mV pp
Voltage Monitor vs. Output Voltage accuracy: (*) 40 ppm
Voltage Set vs. Output Voltage accuracy: (*) 40 ppm
Current Monitor vs. Output Current accuracy: (*) ±(250 nA + 1%)
Current Set vs. Output Current accuracy: (*) ±(1 µA + 1%)
Short term reproducibility: 40 ppm
Thermal stability: ±3 ppm/°C
2.4 Front Panel
(*) in the 200500 V output voltage range.
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Mod. V560E
Mod. A1520P
INTERLOCK
HV ON
HV OUTPUT
S0+ V0- NC
V0+ S0- NC NC S1- V1+
NC V1- S1+ S2+ V2- NC
V2+ S2- NC NC S3- V3+
NC V3- S3+ S4+ V4- NC
V4+ S4- NC NC S5- V5+
NC V5- S5+ S6+ V6- NC
V6+ S6- NC
NC S7- V7+ NC V7- S7+
S8+ V8- NC V8+ S8- NC
NC S9- V9+ NC V9- S9+
S10+ V10- NC V10+ S10- NC S11- V11+ NC NC V11- S11+
IINT IEXT AGND
INTERLOCK
SCALER CMS ECAL 12 CH POS 15mA 500V
Fig. 2.1 – Mod. A1520 P front panel
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Mod. V560E
Mod. A1520PE
INTERLOCK
HV ON
HV OUTPUT
NC NC NC
NC NC NC NC NC NC
NC NC NC NC NC NC
NC NC NC NC S0- V0+
NC V0- S0+ S1+ V1- NC
V1+ S1- NC NC S2- V2+
NC V2- S2+ S3+ V3- NC V3+ S3- NC
NC S4- V4+ NC V4- S4+
S5+ V5- NC V5+ S5- NC
NC S6- V6+ NC V6- S6+
S7+ V7- NC V7+ S7- NC S8- V8+ NC NC V8- S8+
IINT IEXT AGND
INTERLOCK
SCALER CMS ECAL 9 CH POS 15mA 500V
Fig. 2.2 – Mod. A1520 PE front panel
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2.5 Technical Specifications
2.5.1 Packaging
The module is housed in a 10TE-wide, 6U-high mechanics.
2.5.2 External connections The location of all components of the front panel is shown in Fig. 2.1, p.10. The function and electro-mechanical specifications of the external connectors are listed in the following subsections. HV OUTPUT: Mechanical specifications: 75position DialylPhthalate receptacle housing AMP Part No. 201311-3 Electrical specifications: see table below
Table 2.3 – Mod. A1520 P HVOUTPUT connector pin-out Pin number Pin number Name Function (front panel connector) (cable connector)
V0+ 4 76 ch. 0 positive output
S0+ 1 79 ch. 0 positive sensing line
S0- 5 77 ch. 0 negative sensing line
V0- 2 80 ch. 0 negative output
V1+ 11 75 ch. 1 positive output
S1+ 14 72 ch. 1 positive sensing line
S1- 10 74 ch. 1 negative sensing line
V1- 13 71 ch. 1 negative output
V2+ 18 62 ch. 2 positive output
S2+ 15 65 ch. 2 positive sensing line
S2- 20 63 ch. 2 negative sensing line
V2- 16 66 ch. 2 negative output
V3+ 24 60 ch. 3 positive output
S3+ 27 57 ch. 3 positive sensing line
S3- 23 59 ch. 3 negative sensing line
V3- 26 56 ch. 3 negative output
V4+ 31 49 ch. 4 positive output
S4+ 28 52 ch. 4 positive sensing line
S4- 32 50 ch. 4 negative sensing line
V4- 29 53 ch. 4 negative output
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V5+ 36 48 ch. 5 positive output Pin number Pin number Name Function (front panel connector) (cable connector)
S5+ 39 45 ch. 5 positive sensing line
S5- 35 47 ch. 5 negative sensing line
V5- 38 44 ch. 5 negative output
V6+ 43 37 ch. 6 positive output
S6+ 40 40 ch. 6 positive sensing line
S6- 44 38 ch. 6 negative sensing line
V6- 41 41 ch. 6 negative output
V7+ 48 36 ch. 7 positive output
S7+ 51 33 ch. 7 positive sensing line
S7- 47 35 ch. 7 negative sensing line
V7- 50 32 ch. 7 negative output
V8+ 55 25 ch. 8 positive output
S8+ 52 28 ch. 8 positive sensing line
S8- 56 26 ch. 8 negative sensing line
V8- 53 29 ch. 8 negative output
V9+ 60 24 ch. 9 positive output
S9+ 64 21 ch. 9 positive sensing line
S9- 59 23 ch. 9 negative sensing line
V9- 63 20 ch. 9 negative output
V10+ 70 12 ch. 10 positive output
S10+ 65 15 ch. 10 positive sensing line
S10- 71 13 ch. 10 negative sensing line
V10- 66 16 ch. 10 negative output
V11+ 75 11 ch. 11 positive output
S11+ 78 7 ch. 11 positive sensing line
S11- 74 10 ch. 11 negative sensing line
V11- 77 5 ch. 11 negative output
IINT 79 1 INTERLOCK connection
IEXT 80 2 INTERLOCK connection
AGND0 82 3 Analog ground
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Table 2.4 – Mod. A1520 PE HVOUTPUT connector pin-out Pin number Pin number Name Function (front panel connector) (cable connector)
V0+ 24 60 ch. 0 positive output
S0+ 27 57 ch. 0 positive sensing line
S0- 23 59 ch. 0 negative sensing line
V0- 26 56 ch. 0 negative output
V1+ 31 49 ch. 1 positive output
S1+ 28 52 ch. 1 positive sensing line
S1- 32 50 ch. 1 negative sensing line
V1- 29 53 ch. 1 negative output
V2+ 36 48 ch. 2 positive output
S2+ 39 45 ch. 2 positive sensing line
S2- 35 47 ch. 2 negative sensing line
V2- 38 44 ch. 2 negative output
V3+ 43 37 ch. 3 positive output
S3+ 40 40 ch. 3 positive sensing line
S3- 44 38 ch. 3 negative sensing line
V3- 41 41 ch. 3 negative output
V4+ 48 36 ch. 4 positive output
S4+ 51 33 ch. 4 positive sensing line
S4- 47 35 ch. 4 negative sensing line
V4- 50 32 ch. 4 negative output
V5+ 55 25 ch. 5 positive output
S5+ 52 28 ch. 5 positive sensing line
S5- 56 26 ch. 5 negative sensing line
V5- 53 29 ch. 5 negative output
V6+ 60 24 ch. 6 positive output
S6+ 64 21 ch. 6 positive sensing line
S6- 59 23 ch. 6 negative sensing line
V6- 63 20 ch. 6 negative output
V7+ 70 12 ch. 7 positive output
S7+ 65 15 ch. 7 positive sensing line
S7- 71 13 ch. 7 negative sensing line
V7- 66 16 ch. 7 negative output
V8+ 75 11 ch. 8 positive output
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Pin number Pin number Name Function (front panel connector) (cable connector)
S8+ 78 7 ch. 8 positive sensing line
S8- 74 10 ch. 8 negative sensing line
V8- 77 5 ch. 8 negative output
IINT 79 1 INTERLOCK connection
IEXT 80 2 INTERLOCK connection
AGND0 82 3 Analog ground
INTERLOCK: Mechanical specifications : female LEMO-00 connector Electrical specifications: open/closed contact
2.5.3 Cabling
Fig. 2.2 and 2.3 show, respectively, details about the parts constituting the front panel channel connectors and the connector to be mounted on the cable in order to match with the channel connector. These parts are available from AMP INCORPORATED, Harrisburg Pennsylvania 17105, U.S.A..
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Corner Guide Pin Fixed Jackscrew Female Corner Guide Socket (AMP 201046-2) (AMP 200875-1) (AMP 201047-2)
1 2 3 4 5 7
8 10 11 12 13 14
15 16 17 18 20 21
22 23 24 25 26 27
28 29 30 31 32 33 75 Position Socket Housing 34 35 36 38 (AMP 201311-3) 37 39
40 41 42
43 44 45 47 46 48 50 Socket 49 51 52 53 54 (AMP 163088-2) 55 56 55 58 59 60 63 62 64 65 66 67
70 71 72 73 74 75 76 77 78 79 80 82
(AMP 201046-2) (AMP 201047-2) Corner Guide Pin (AMP 200874-1) Fixed Jackscrew Male Corner Guide Socket
Fig. 2.3 – Channel connector parts
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Turnable Long Jackscrew Male Corner Guide Pin (AMP 201911-1) Corner Guide Socket (AMP 201046-2) (AMP 201047-2)
3 2 1 5 4 7 11 10 8 Two Piece Shields 13 12 o 14 180 Cable Exit 17 16 15 20 18 (AMP 202713-1) 21
24 23 22 27 26 25 30 29 28 33 32 31 75 Position Socket Housing 36 35 34 (AMP 201310-3) 39 38 37 42 41 40 45 44 43 48 47 46 50 51 49 Pin 54 53 52 (AMP 163086-2) 56 55 57 60 59 58 63 64 62 67 66 65 71 70 72 75 74 73 77 76 78 82 80 79
(AMP 201046-2) (AMP 201910-1) (AMP 201047-2) Corner Guide Pin Turnable Long Jackscrew Female Corner Guide Socket
Fig. 2.4 – Cable connector parts
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2.5.4 Displays
HV ON (red LED) INTERLOCK (green LED, refer to § 4.3 for further details)
2.5.5 Other components
J1, J2 jumpers for INTERLOCK options selection. Please refer to Fig. 2.4 for jumpers location.
INTERLOCK JUMPERS
FRONT PANEL
Fig. 2.5 – INTERLOCK jumpers location
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3. Safety information and installation requirements
3.1 General safety information
This section contains the fundamental safety rules for the installation and operation of the A 1520P board. Read thoroughly this section before starting any procedure of installation or operation of the product.
3.1.1 Injury Precautions
Review the following precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use the product only as specified. Only qualified personnel should perform service procedures.
Avoid Electric Overload. To avoid electric shock or fire hazard, do not apply a voltage to a load that is outside the range specified for that load.
Avoid Electric Shock. To avoid injury or loss of life, do not connect or disconnect cables while they are connected to a voltage source.
Do Not Operate Without Covers. To avoid electric shock or fire hazard, do not operate this product with covers or panels removed.
Do Not Operate in Wet/Damp Conditions. To avoid electric shock, do not operate this product in wet or damp conditions.
Do Not Operate in an Explosive Atmosphere. To avoid injury or fire hazard, do not operate this product in an explosive atmosphere.
Do Not Operate With Suspected Failures. If you suspect there is damage to this product, have it inspected by qualified service personnel.
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3.2 Safety Terms and Symbols on the Product
These terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the marking. WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product.
The following symbols may appear on the product:
DANGER ATTENTION High Voltage Refer to Manual
3.3 Installation
The Mod. A 1520P is a double-width board (10 TE-wide) which can be inserted in any slot of the SY 1527 crate. At power ON the SY 1527 system processor will scan all the slots in the crate to find out where the module is plugged and what kind of module it is. For correct operation it is recommended to turn off the SY1527 crate before the board’s insertion/extraction, although insertion/extraction in/from a powered crate does not damage the board’s circuitry.
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4. Operating modes
The Mod. A 1520P can be controlled, either locally or remotely, through the SY 1527 software interface. For details on SY 1527 system operation, please refer to the User's Manual of this product. The following sections contain a description of commands available for the board control and status monitoring.
ATTENTION
THE MOD. A 1520P BOARD REQUIRES SY 1527 FIRMWARE VERSION 1.09.04 OR LATER
4.1 Output control and monitoring
For each output channel, it is possible, through the SY 1527 system, to perform the following operations:
Assign to channel a symbolic name Set output voltage (VSET) Set max. output current (ISET) Set output voltage software limit (SVMAX) Set voltage ramp-up speed (RAMP-UP) Set voltage ramp-down speed (RAMP-DOWN) Set TRIP parameter ON/OFF POWER ENABLE option Switch channel ON/OFF Monitor output voltage (VMON) Monitor output current (IMON) Monitor channel status Null the IMON offset (IMONOFFSET), see § 4.5 Compensate for drift due to Temeprature variations (T_DRIFT), see § 4.4
If the POWER ENABLE option is ON (default setting), the channel is intrinsically ON (it is supplied): by switching it ON/OFF (ON/OFF parameter), the output voltage can be either provided or not. If the POWER ENABLE option is OFF, the channel is intrinsically OFF (it is not supplied): the output voltage cannot be provided in any case (whatever the ON/OFF parameter setting); this option can be useful to cut-off one channel from the rest of the board, while the other ones keep on working.
The following messages may be returned by the SY 1527 when monitoring the channel status:
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OFF (channel turned OFF) RUP (channel ramping up) RDWN (channel ramping down) OVC (channel in OVERCURRENT condition) OVV (channel in OVERVOLTAGE condition) UNV (channel in UNDERVOLTAGE condition) EXTTRIP (channel OFF due to external TRIP line signal) INTTRIP (channel OFF due to internal OVERCURRENT condition) EXT_DIS (channel disabled by board INTERLOCK protection)
Moreover it is possible to monitor board temperature and to check board status; the following messages may be returned by the SY 1527 when monitoring the board status:
UNDER_TEMP (board temperature < 5°C ) OVER_TEMP (board temperature > 65°C)
4.2 Voltage sensing
All output channels have a Remote Sensing Line to compensate for the voltage drop over the cable. Voltage is monitored directly at the load by an high input impedance differential amplifier; the voltage sensing circuit is schematically illustrated in the figure below.
OUT + Rcable
1 M
r cable SENSE + L O VMON A SENSE - D
r cable 1 M
OUT- Rcable
Fig. 4.6 – Remote voltage sensing scheme
4.3 Interlock
The board is provided with an INTERLOCK system which switches OFF simultaneously all the channels if the INTERLOCK contact is removed; there are various INTERLOCK options which can be selected by means of two PCB jumpers (see Fig. 2.5):
a) if J2 is inserted (J1 not inserted), INTERLOCK is disabled and the green front panel LED is always lit.
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b) if J1 is inserted (J2 not inserted), the IINT and IEXT pin of the HV OUTPUT cable connector should be short-circuited; in this case if the cable connector is unplugged the output channels are immediately turned OFF and the green LED is switched off. c) If no jumper is inserted, the green LED doesn't light on and the board is disabled until the LEMO INTERLOCK input is shorted to ground.
IINT IEXT
CONTROL SIGNAL
J2 J1
INTERLOCK INTERLOCK LED CONNECTOR
+5 V
Fig. 4.2 – INTERLOCK connections scheme
4.4 Temperature drift compensation
The channels are provided with an automatic compensation function for voltage drift due to temperature variations. The User must set the T_DRIFT parameter with the expected drift2 (mV/°C), eventually obtained from thermal chamber tests (default value is 0).
4.5 IMON offset nulling
The IMONOFFSET parameter can be set either to ABS (absolute) or to REL (relative). The default setting is ABS, which means that IMON=0 is considered as the IMON baseline. When the User switches to REL, the IMON value present on the channel is taken as baseline from that moment on.
4.6 Transparent Mode access
The communication with the board can take place in “Transparent Mode” (from the System’s Main menu), which is password protected; this allows to access the “Calibration Mode”, which can be either “Manual” or “Automatic”. A mostly self-explanatory menu will guide the User through the calibration procedure.
2 Valid T_DRIFT values can be either positive or negative
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5. T1520 P voltmeter board
The Mod. T1520 P 12-channel board has been issued for calibration purposes. It is provided with three 2 mm sockets (two for the voltage and one for the current) to be connected with the multimeter and two serial links (to be connected with the oscilloscope and with the multimeter respectively) on 9-pin DB connectors. Settings on the channels can be performed via 9 groups of jumpers placed on the board side (the group closest to the front panel is related to channel 0 and so on). The jumpers description is shown in Fig. 5.1.
connected: AGND connected with FAGND
not connected: simulates connected: high load=360 k Rcable=15 not connected: high load=500 M
Fig. 5.1 – Mod. T1520 P jumpers group (1 channel)
Front Panel
Fig. 5.2 – Mod. T1520 P jumpers position
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