Caen SY 1527 Manual

Hardware
Installation
Guide
MOD. SY 1527
3 December 2002
Revision n.3
UNIVERSAL MULTICHANNEL
POWER SUPPLY SYSTEM
HARDWARE INSTALLATION
GUIDE, REV.
3
NPO:
00103/97:1527x.MUTx/03

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.

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TABLE OF CONTENTS
1. ABOUT THIS GUIDE................................................................................................................................6
1.1 ORGANISATION ......................................................................................................................................7
1.2 CONVENTIONS........................................................................................................................................8
1.2.1 Safety rules ....................................................................................................................................8
1.2.2 Electrical signal specifications......................................................................................................8
2. GENERAL DESCRIPTION OF THE SYSTEM.....................................................................................9
2.1 OVERVIEW .............................................................................................................................................9
2.2 SHORT FUNCTIONAL DESCRIPTION .......................................................................................................11
2.3 TECHNICAL SPECIFICATION TABLE .......................................................................................................14
3. DESCRIPTION OF THE MECHANICAL PARTS..............................................................................18
3.1 THE SY1527 MAINFRAME AND ITS MECHANICAL PARTS ......................................................................18
3.2 BOARD SECTION...................................................................................................................................20
3.2.1 Board Backplane.........................................................................................................................20
3.2.2 High and Low Voltage, Floating and Miscellaneous boards......................................................20
3.2.3 Distributors .................................................................................................................................20
3.2.4 Branch Controllers......................................................................................................................20
3.3 FAN TRAY SECTION...............................................................................................................................20
3.4 POWER SUPPLY SECTION ......................................................................................................................22
3.4.1 Power Supply Backplane.............................................................................................................23
3.4.2 Primary Power Supply (Mod. A 1531)........................................................................................23
3.4.3 Power Supply Units (Mod. A1532)..............................................................................................25
3.5 CPU SECTION.......................................................................................................................................27
3.5.1 Interface bus backplane...............................................................................................................29
3.5.2 CPU board ..................................................................................................................................29
3.5.3 Interface board............................................................................................................................29
3.5.4 Additional interface boards.........................................................................................................29
3.6 FRONT PANEL.......................................................................................................................................30
3.6.1 LCD screen, keypad and compact switch....................................................................................31
3.6.2 Interface Bus Section...................................................................................................................31
3.6.3 I/O Control Section......................................................................................................................32
3.7 REAR PANEL ........................................................................................................................................35
4. TECHNICAL SPECIFICATIONS..........................................................................................................36
4.1 PACKAGING..........................................................................................................................................36
4.2 POWER REQUIREMENTS........................................................................................................................36
4.3 EXTERNAL CONNECTORS, DISPLAYS AND SWITCHES ............................................................................36
4.3.1 INPUTS .......................................................................................................................................36
4.3.2 OUTPUTS ...................................................................................................................................37
4.3.3 I/O CONNECTORS.....................................................................................................................38
4.3.3.1 I/O control section...................................................................................................................................38

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4.3.3.2 Interface bus section............................................................................................................................... 39
4.3.4 DISPLAYS................................................................................................................................... 40
4.3.5 SWITCHES ................................................................................................................................. 41
4.3.6 BUTTONS................................................................................................................................... 42
4.4 EXTERNAL CONNECTORS, DISPLAYS AND SWITCHES OF THE PRIMARY POWER SUPPLY....................... 43
4.4.1 INPUTS....................................................................................................................................... 43
4.4.2 OUTPUTS................................................................................................................................... 43
4.4.3 DISPLAYS................................................................................................................................... 43
4.4.4 SWITCHES ................................................................................................................................. 44
4.5 EXTERNAL DISPLAYS OF THE POWER SUPPLY UNITS ........................................................................... 44
4.5.1 DISPLAYS................................................................................................................................... 44
4.6 EXTERNAL CONNECTORS AND SWITCHES OF THE REAR PANEL............................................................. 44
4.6.1 INPUTS....................................................................................................................................... 44
4.6.2 SWITCHES ................................................................................................................................. 45
5. UNPACKING THE SYSTEM................................................................................................................. 46
5.1 CHECK LIST ......................................................................................................................................... 46
6. SAFETY INFORMATION AND INSTALLATION REQUIREMENTS........................................... 47
6.1 GENERAL SAFETY INFORMATION ......................................................................................................... 47
6.1.1 Injury Precautions...................................................................................................................... 47
6.1.2 Product Damage Precautions..................................................................................................... 48
6.1.3 EC Certifications and Compliances............................................................................................ 48
6.2 TERMS IN THIS MANUAL...................................................................................................................... 48
6.3 TERMS AND SYMBOLS ON THE PRODUCT............................................................................................. 49
6.4 INSTALLATION REQUIREMENTS............................................................................................................ 49
6.4.1 Standalone operation.................................................................................................................. 49
6.4.2 Remote operation via terminal ...................................................................................................49
7. HARDWARE INSTALLATION AND SET-UP.................................................................................... 50
7.1 INSTALLATION..................................................................................................................................... 50
7.1.1 Installing the primary power supply and the power supply units............................................... 50
7.1.2 Installing the boards................................................................................................................... 52
7.1.3 Connecting the system to the mains............................................................................................ 53
7.2 HARDWARE SETTINGS.......................................................................................................................... 53
7.3 OPERATING MODES AND RELEVANT HARDWARE SET-UPS.................................................................... 54
7.3.1 Standalone operation.................................................................................................................. 54
7.3.2 Remote operation via Terminal .................................................................................................. 55
7.3.3 Remote Operation via Web Browser .......................................................................................... 56
7.3.4 Remote operation via Host Computer ........................................................................................ 56
7.4 CABLING.............................................................................................................................................. 56
7.4.1 Standalone operation.................................................................................................................. 56
7.4.2 Remote operation via terminal ...................................................................................................57
7.4.2.1 Using the RS232 interface...................................................................................................................... 57
7.4.2.2 Using H.S. CAENET (Multicrate Operation) ........................................................................................ 59
7.4.2.3 Using TCP/IP Protocol (Telnet connection) ........................................................................................... 59

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7.4.3 Remote operation via Web Browser............................................................................................59
7.4.4 Remote operation via host computer...........................................................................................59
7.5 GROUNDING .........................................................................................................................................59
8. SYSTEM POWER-ON.............................................................................................................................60
8.1 PRELIMINARY CHECK ...........................................................................................................................60
8.2 LOCAL POWER-ON...............................................................................................................................60
8.3 REMOTE POWER-ON.............................................................................................................................61
APPENDIX A....................................................................................................................................................62
SY1527 SYSTEM FRONT PANEL.......................................................................................................................63
LIST OF FIGURES
FIG. 2.1 – LAYOUT OF THE MAIN MECHANICAL SECTIONS OF THE SY1527 MAINFRAME........................................9
FIG. 2.2 – BLOCK DIAGRAM OF THE FUNCTIONAL PARTS OF THE SY1527 SYSTEM...............................................13
FIG. 3.1 – DETAILS OF THE MECHANICAL PARTS CONTAINED IN THE SY1527 MAINFRAME..................................19
FIG. 3.2 –AIR FLOW FROM THE FAN TRAY UNIT INTO THE BOARD SECTION...........................................................22
FIG. 3.3 – FRONT PANEL OF THE PRIMARY POWER SUPPLY (MOD. A1531).........................................................24
FIG. 3.4 – FRONT PANEL OF THE POWER SUPPLY UNIT (MOD. A1532)................................................................26
FIG. 3.5 – FRONT PANEL OF THE SY1527 SYSTEM ...............................................................................................30
FIG. 3.6 – REAR PANEL OF THE SY1527 SYSTEM .................................................................................................35
FIG. 4.1 – TRIP IN/OUT PIN ASSIGNMENT..........................................................................................................38
FIG. 4.2 – RS232 PIN ASSIGNMENT......................................................................................................................39
FIG. 7.1 – STANDALONE OPERATION ...................................................................................................................54
FIG. 7.2 – REMOTE OPERATION VIA TERMINAL ...................................................................................................55
FIG. 7.3 – LOCATION OF RS232 INTERFACE, VGA PORT, PS/2 CONNECTOR AND ETHERNET INTERFACE............57
FIG. 7.4 – ELECTRO-MECHANICAL SPECIFICATIONS OF THE RS232 CABLE (9-PIN TO 9-PIN)................................58
FIG. 7.5 – ELECTRO-MECHANICAL SPECIFICATIONS OF THE RS232 CABLE (9-PIN TO 25-PIN)..............................58
LIST OF TABLES
TABLE 2.1 - TECHNICAL SPECIFICATIONS OF THE SY1527 MAINFRAME: GENERAL..............................................14
TABLE 2.2 - TECHNICAL SPECIFICATIONS OF THE SY1527 MAINFRAME: FRONT / REAR PANEL COMPONENTS......15
TABLE 2.3 - TECHNICAL SPECIFICATIONS OF THE SY1527 MAINFRAME: INPUT AND OUTPUT SIGNALS ................16
TABLE 3.1 – MECHANICAL AND ELECTRICAL FEATURES OF THE A1531 PRIMARY POWER SUPPLY.....................25
TABLE 3.2 – MECHANICAL AND ELECTRICAL FEATURES OF THE A1532 POWER SUPPLY UNIT............................27
TABLE 4.1 – RS232 PORT DEFAULT SETTINGS....................................................................................................40
TABLE 5.1 – CHECK LIST OF THE PARTS NEEDED FOR SYSTEM INSTALLATION......................................................46

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1. About this guide
The purpose of this guide is to illustrate:
• the mechanical and electrical features of the SY1527 Universal Multichannel
Power Supply System,
• the requirements and instructions for its correct installation and first power-ON.
The preliminary section of this guide starts with a short description of the SY1527 system
and a summary of its main features and performances.
The core of the guide consists of a reference section with a detailed description of the
system’s mechanical and electrical specifications, the installation requirements and
instructions.
A detailed description of system parameters, control commands and operating modes
can be found in the User’s Manual.

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1.1 Organisation
This guide is organised as follows:
Chapter 1 – About this guide: it briefly describes this guide’s objectives and organisation;
Chapter 2 – General description of the system: it contains an overview of the system and
its main features, a very brief functional description and some reference tables with a
summary of the system technical specifications;
Chapter 3 – Description of the mechanical parts: it offers a detailed description of the
system’s mechanical; in particular, the last two sections are devoted to the description of
the front and rear panels, including displays and external connectors;
Chapter 4 – Technical specifications: this reference section contains all the system’s
technical data about the system, such as mainframe mechanics, power requirements,
external connections and interfaces and a chapter devoted to system tests and
performances;
Chapter 5 – Unpacking the system: it consists of some notes regarding unpacking the
system and a useful check list of all parts needed for installation;
Chapter 6 – Safety information and installation requirements: it contains general safety
rules and the requirements for a correct system installation;
Chapter 7 – Hardware installation and set-up: it contains installation and correct system’s
set-up instructions;
Chapter 8 – System Power-ON: it contains the procedure for the first system’s Power-ON
together with a first check of its correct operation;
Appendix A – Front Panel of the SY1527 system: a useful reference figure of the SY1527
Front Panel, including the Primary Power Supply and the Power Supply Units.

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1.2 Conventions
The conventions adopted all through this guide are briefly listed in the following.
1.2.1 Safety rules
The user is requested to pay particular attention to the parts of the document containing
the following terms:
WARNING:
Warning statements identify conditions or practices that could result in injury or
loss of life.
CAUTION:
Caution statements identify conditions or practices that could result in damage to
this product or other property.
Please pay particular attention to the grey areas where warning and caution statements
are emphasised, as shown in the following examples:
CAUTION
PLEASE NOTE THAT THE BOTTOM, TOP AND SIDE GRIDS OF THE FAN TRAY
UNIT MUST NOT BE COVERED UNDER ANY CIRCUMSTANCES!
WARNING
DO NOT OPERATE WITHOUT COVERS!
1.2.2 Electrical signal specifications
The polarity of the electrical signals can be chosen via software by the user. As a
consequence, in this guide the following convention has been adopted:
TRUE: an electrical signal is indicated as TRUE when it is active.
FALSE: an electrical signal is indicated as FALSE when it is not active.

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2. General description of the system
This preliminary section contains a short description of the SY1527 system with a
summary of its main features and technical specifications.
A detailed description of system parameters and operating modes can be found in the
User’s Manual.
2.1 Overview
The SY1527 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 it to meet the
requirements of a wide range of experimental conditions. The latter range from those of
LHC experiments, in which the system’s features 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 (refer to Fig. 2.1):
- 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.
Board Section
Fan Unit
1 2 3
41 5 6
7 8 9
.
0 -
CM
DDELACK
CPU &
Front Panel
Section
Power Supply
Section
Power Supply Units Primary Power Supply
Fig. 2.1 – Layout of the main mechanical sections of the SY1527 mainframe

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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 communication interfaces
provides full compatibility with the previous systems and the possibility of controlling
heterogeneous external devices.
Modularity has been one of the leading criteria in the system design and development:
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 system flexibility, 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
electronics can be however remotely controlled by single boards which are inserted in
the SY1527 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 software allows to control and correlate trip conditions on the
channels of the crate as well as of other crates connected to it.
Easy access to the computing core and peripherals and live insertion and extraction of
the boards, which reduces the global down time, 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. 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

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via network facilities. Actually, Telnet and WWW access facilities allow system’s remote
debugging and technical support, including future firmware upgrading.
2.2 Short Functional description
A block diagram of the SY1527 system is shown in Fig. 2.2, p.13.
A single crate can host up to 16 Channel Boards, which can be chosen in a wide range
of plug-in boards, from standard HV/LV boards and floating boards to generic I/O boards
monitoring external parameters or branch controllers. All the types of boards can be
freely mixed in the same crate, fitting the user's needs.
Both the System’s Power-On and the Channel Out Enable can be performed either
locally or remotely. Remote Enable is performed by sending the proper input signal via
the relevant front panel connector.
Each crate may be controlled either locally or remotely. Local control is performed
manually through a key-pad, a compact switch and a 7.7" colour LCD located on the
front panel. Remote control is feasible via the interface connectors located on the front
panel. These include a RS232 interface, which can be used to plug in a video terminal
(ANSI VT100 or compatible) or a IBMTM PC, a VGA port to connect an external standard
VGA monitor and a PS/2 connector to plug in an external keyboard. The usual HIGH
SPEED (H.S.) CAENET interface is also available to daisy-chain more SY1527 crates
(up to 99 crates).
A sophisticated Software User Interface is available both in local or remote control,
featuring symbolic names for channels, custom status displays and other features
designed to help the management of a large number of channels.
Programmable parameters for each power channel include two voltage values (V0set,
V1set) and two current limit values (I0set, I1set). The switching from one value to the
other is performed via two external (NIM or TTL) input levels (VSEL, ISEL). The
maximum rate of change of the voltage (Volt/second) may be programmed for each
channel. Two distinct values are available, Ramp-Up and Ramp-Down. Any command
to change the voltage will result in a linear voltage increase or decrease with time, the
rates being determined by the Ramp-Up or Ramp-Down parameters, respectively.
For the boards with programmable current hardware protections the ISET channels’
values represent a software-controlled hardware protection on the channels' currents. In
this case the channel cannot draw a current higher than its programmed limit.
For the boards with fixed current hardware protections, i.e. boards which have the
current hardware protection fixed to a common value for all the channels, the IMON
values are used to signal a fault, but the channels can draw a current larger than the
ISET values.
In both cases, if a channel tries to draw a current larger than the programmed limit, it is
signalled to be in OVERCURRENT. The System detects this state as a fault and reacts
according to the setting of the TRIP parameter, namely:
1) TRIP = infinite (constant CURRENT mode)
If the Board has programmable current hardware protections, the output voltage is
varied to keep the current below the programmed limit. The channel acts like a
current generator.

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If the Board has fixed current hardware protections, the output current is permitted
to exceed the ISET value; the channel acts like a current generator only if the
maximum current value is reached.
2) TRIP = finite value (TRIP mode)
In this case, the channel behaves as in the constant CURRENT mode for a time
equal to the finite value set as TRIP parameter, and then it is switched off according
to the selected Power-Down option (Kill/Ramp-Down). If the Kill option is selected,
the channel will be switched off immediately. If the Ramp-Down option is selected,
the voltage will drop to zero at a rate determined by the value of the Ramp-Down
parameter programmed for that channel.
Other front panel signals and relevant LEDs are foreseen to signal the channel status,
such as OVERVOLTAGE, UNDERVOLTAGE, CHANNEL ON and TRIP. Another set of
LEDs warn about possible fault conditions in the system operation (OVER
TEMPERATURE, FAN FAILURE, POWER FAILURE). For a detailed description of the
channel parameters please refer to the User’s Manual. A description of all front panel
signals and LEDs can be found in Section 4.3, p.36 of this guide.
A RESET can be generated either manually via a front panel button or remotely by
sending a proper signal through the relevant connector. In both cases it is possible to
reset only the system’s CPU or both the CPU and the boards, depending on the duration
of the RESET signal.
The System may be instructed to react to a Power On or to a Restart bringing all the
channels from zero to the programmed value without the user's intervention via the
Power-On parameter. If this option is enabled, the System will recover smoothly from a
power failure or RESET, automatically restoring the status it had before the power was
interrupted.
KILL and INTERLOCK functions have also been implemented and allow to drop the
channel output voltage to zero, independently from the Ramp-Down parameter set.
For a detailed description of all system control commands and monitoring signals please
refer to the User’s Manual.
In order to protect the System from improper use, a multilevel management of the user’s
profiles has been foreseen, including the possibility of having password protection for
each channel or group of channels. In particular, three different login levels are available:
Guest, User and Administrator, each with different levels of access ability to the system
parameter monitoring and setting. Moreover, the possibility of defining preferred custom
environments is foreseen for each single user.
Daisy-chain configuration of more SY1527 crates can be achieved by using the
H.S. CAENET connectors located on the front panel. The chain can be controlled
remotely by a SY1527 system configured as CAENET Controller allowing for Multicrate
Operation, i.e. the possibility of controlling and monitoring interactively the daisy-chained
crates one at a time, either from any one of the SY1527 chain’s crates or from a PC or
video terminal externally connected to any one of the crates. Moreover, in Multicrate
Operation it is possible to connect to the chain a SY127 system, equipped with a
A128HS board, and interact with it via H.S. CAENET. The same operation is also
possible with a SY527 system.
The Ethernet interface further extends the access facilities to the system: it allows the
use of a Browser or just a Telnet connection to monitor and control interactively each
crate connected to the network. This type of link, which can be reduced to the
Customer’s Intranet in order to have secure access, allows to perform remotely a wide
range of tasks, such as system debugging, firmware upgrading and even technical

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support. A special software interface has been developed for monitoring and setting of
the system parameters from TCP/IP environment.
Further remote control interfaces are available on request and can be inserted into the
expansion slots on the front panel.
Board Backplane
16-bit Interface Bus Back
p
lane
HV Board
Slot 15
I/O Board
CPU
Front Panel (top)
LCD Screen
1 2 3
4 5 6
789
.0 -
ACK CMD BS
+-+-
Contrast Brightness
Keyboard
Compact Switch
Input/Output
Expansion Slots
I/O
Controller of: Ke
y
board,
Compact Switch,
LCD contrast
and brightness
S
C
R
E
E
N
V
G
A
R
S
2
3
2
Ethernet
Kbd/
Mouse
Front Panel (bottom)
A1532
Power
Supply
Unit
(750 W)
ON
OFF
REMOTE
POWER
LINE
P
O
W
E
R
HV Board
Slot 1
HV Board
Slot 0
R
S
2
3
2
A1532
Power
Supply
Unit
(750 W)
A1532
Power
Supply
Unit
(750 W)
A1531
Primary
Power
Supply
E
X
P
A
N
S
I
O
N
E
X
P
A
N
S
I
O
N
Fig. 2.2 – Block diagram of the functional parts of the SY1527 system

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2.3 Technical specification table
Table 2.1 - Technical specifications of the SY1527 mainframe: general
Packaging - 19"-wide, 8U-high Euro-mechanics rack;
- Depth: 720 mm.
Weight -Mainframe (*): 24 kg
-Mod. A1532: 3.2 kg
Power Requirements
Voltage range: 100/230 V
Frequency: 50/60 Hz
Power: 3400 W
Max. number of boards per crate 16
Max. number of Power Supply
Units per crate
3
Primary power supply output ±12 V, 8 A
+5 V, 20 A
Power supply unit output +48 V, 15.6 A
Max. output power 2250 W
Operating temperature From 0°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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Table 2.2 - Technical specifications of the SY1527 mainframe: front / rear panel components
(refer to the figure in Appendix A)
Displays
(I/O control
section)
− GEN, red LED, lights up when GENERAL STATUS signal, corresponding to a
logic combination (defined by the user) of OVC, UNV, OVV, TRIP, is TRUE;
− CH-ON, red LED, lights up when at least one channel is ON;
− OVC, UNV, TRIP, OVV, red LEDs, light up when at least one channel is in Over
Current, Under Voltage, Trip, Over Voltage condition, respectively;
− RSTFLAG, red LED, lights up after a RESET;
− CHK PASS, green LED, lights up when the initial system check has been
performed successfully and the system is ready.
− VSEL, ISEL, green LEDs, light up when the relevant connectors for voltage and
current selection, respectively, are TRUE;
− KILL, green LED, lights up when the system is in KILL condition;
− NIM, TTL, green LEDs, light up when the relevant standard is selected;
− RESET, red/orange LED, lights up when a RESET occurs: it is initially red and
then becomes orange, depending on the duration of the RESET signal;
− LOCAL ENABLE, REM ENABLE, red LEDs, light up, respectively, when the
Local Enable mode is selected and when the Remote Enable mode is selected
and the proper REM EN signal is sent in;
− OVERTEMP, FAN FAILURE, PWR FAILURE red LEDs, light up when the Over
Temperature, Fan Failure and Power Failure condition, respectively, occurs;
− INTERLOCK, red LED, lights up as the system is in INTERLOCK condition.
− LOCAL NET, CAENET, red LEDs, light up when the relevant connectors are in
activity;
− MASTER, red LED, lights up when the HV SYNC clock is internally generated.
Displays
(Power
Supplies)
− OK, yellow LED, lights up when the system is turned on.
− +5, +12, -12, +48, green LEDs, light up as the relevant power supply is present;
− MAIN, orange LED, when lit up, it warns that the system is connected to the
mains and the MAIN switch on the rear panel is in position 1.
Switches
− NIM/TTL switch for the selection of the level standard of the output signals;
− LOCAL ENABLE/DISABLE/REMOTE ENABLE switch, which allows,
respectively, to enable the channels locally or to disable them or to allow their
remote enable via the proper ENABLE input signal;
− INTERLOCK CLOSED/OPEN switch to select if the INTERLOCK function is
active when the contact is closed or open, respectively.
− MAIN switch (rear panel) to power the Power Supply Section;
− POWER ON key (front panel, primary power supply) to power on the system
locally or to enable its remote power on.
Buttons RESET push button: if TRESET > TRCPU = 100÷200 ms CPU is reset; if TRESET > TRCH = TRCPU+900 ms CPU, boards are reset and the channels are turned
off. The Reset must be enabled via the RESET FLAG software window.
Local Control
Interfaces
− 7.7" colour LCD screen, with brightness and contrast control buttons;
− 15-key keypad;
− compact switch (8 directions + press action).
Remote
Control
Interfaces
− H.S. CAENET;
− LOCAL NET (to control non-intelligent systems ONLY);
− One PS/2 connector for external PC keyboard;
− VGA-standard connector for external VGA monitor;
− ETHERNET (TCP/IP);
− RS232 interface for external VT100 or PC.
Optional
Interfaces − CAN-bus.

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Table 2.3 - Technical specifications of the SY1527 mainframe: input and output signals
(refer to the figure in Appendix A)
VSEL: Std. NIM/TTL; 00-type LEMO connector.
Function: channel voltage selection.
ISEL: Std. NIM/TTL; 00-type LEMO connector.
Function: channel current selection.
RESET: Std. NIM/TTL; 00-type LEMO connector.
Function: RESET from the front panel. If the duration of the RESET
signal is > TRCPU=100÷200 ms, only the CPU is reset; if it is > TRCH=
TRCPU + 900 ms, also the boards are reset and the channels turned
off. The Reset must be enabled via the RESET FLAG software
window.
KILL: Std. NIM/TTL; 00-type LEMO connector.
Function: KILL from the front panel: it turns all channels off.
ENABLE: Std. NIM/TTL; 00-type LEMO connector.
Function: remote enable.
INTERLOCK: open/closed contact; 00-type LEMO connector.
Function: INTERLOCK command: it turns all the channels off as it is
open/closed, according to the position of the relevant switch.
INPUTS
REMOTE IN: +12 V, 50 mA max., electr. Insul.; tol.:-40%÷+20%;00LEMO
connector.
Function: remote power-on of the system.
OVC: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: at least one channel is in Over Current.
UNV: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: at least one channel is in Under Voltage.
OVV: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: at least one channel is in Over Voltage.
CH-ON: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: at least one channel is ON.
RST FLAG: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: a RESET occurred.
CHK PASSED: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: initial system check successful and system ready.
TRIP: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: at least one channel in Trip condition.
GEN: Std. NIM/TTL (selectable); 00-type LEMO connector.
Function: GENERAL STATUS indication; corresponds to the logic
combination (defined by the user) of OVC, UNV, OVV, TRIP.
OUTPUTS
REMOTE OUT: +12 V level, referred to the crate ground; tolerance: -20% ÷+20%; 00-
type LEMO connector.
Function: remote power-on of the adjacent daisy-chained crate.
HVSYNC: Bidirectional differential signal ; 2-pin LEMO connectors.
Function: sync clock for the PWS Units ((RS485 Std., 1.25 MHz).
LOCAL NET: Bidirectional differential signal; 2-pin LEMO connector.
Function: LOCAL bus for the control of non-intelligent systems ONLY.
CAENET: Bidirectional CAENET; 00-type LEMO connector.
Function: H.S. CAENET interface.
I/O
TRIP IN/OUT: Bidirectional differential signal; 5x2-flat connectors.
Function: external TRIP lines to handle TRIP conditions.

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All the above signals, except for the REMOTE IN/OUT, are referred to a common ground
(COMMON GROUND) and are galvanically insulated up to 150 V with respect to the ground of
the crate (CRATE GROUND).

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3. Description of the mechanical parts
This section contains a description, from a mechanical point of view, of the parts which
constitute the SY1527 mainframe’s universal multichannel power supply system.
3.1 The SY1527 mainframe and its mechanical parts
The SY1527 system is hosted in an 8U-high, 19”-wide (84TE) EURO-mechanics rack.
The depth of the rack is about 720 mm.
The SY1527 mainframe can be essentially divided into four main mechanical sections
(refer to Fig. 2.1, p.9):
 Board section;
 Fan tray unit;
 CPU and front panel section;
 Power supply section.
Fig. 3.1 shows these mechanical components of the four sections in some further detail.
The higher 6U-high section of the mainframe’s rear part can host up to 16 boards, while
the lower 2U-high section contains the fan tray unit.
On the front part of the mainframe the higher 4U-high section hosts the front panel and
the CPU section, while the lower 4U-high section is devoted to the Power Supply Units
and to the Primary Power Supply (the latter is always located on the bottom right).
The mainframe structure is made of alodyne-treated aluminium which was chosen for its
high conductivity and light weight. Two panels cover the sides of this inner frame, while
the rear panel and the front panel complete the coverage of the structure. All the panels
are fixed with conductive screws in order to ensure electrical conductivity.
A description of each part can be found in the following sections.

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1 2 3
41 5 6
7 8 9
.
0 -
CMD DEL ACK
Board Section
with 16 slots
Board Backplane
with the connectors for the
16 slots and power supply
for the fan unit
Fan Unit
with 6 horizontally-
oriented fans
Power Supply Backplane
with the connectors for the
Power Supplies
CPU board
Interface Board
for the I/O control
Interface Bus
Backplane
with 6 slots
Primary
Power Supply
Power Supply Units
Front Panel
Ethernet board
Fig. 3.1 – Details of the mechanical parts contained in the SY1527 mainframe

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3.2 Board Section
This section is located in the mainframe’s rear upper 6U-high part and hosts the 16 slots
for the insertion of boards (refer to Fig. 2.1, p.9).
This section is empty when it is delivered to the customer. It can house up to 16 vertically
positioned boards, which can be High Voltage or Low Voltage (HV/LV) boards,
Distributors, etc.. The boards must be 6U-high and slide on special guides until they are
plugged into the relevant connectors of the Board Backplane.
The 16 slots are numbered starting from left (Slot 0) to right (Slot 15). They are
completely equivalent, i.e. the user can insert in each slot either a HV/LV board or a
distributors, indifferently. The HV/LV boards can be Positive, Negative or Floating
boards. At Power-On the processor will scan all the slots to find out where the boards are
plugged in and what kind of boards they are.
Section 3.2.1 illustrates the Board Backplane, while Sections 3.2.2, 3.2.3 and 3.2.4 are
devoted to a wide range of boards compatible with the SY1527 system, specifically to the
HV/LV, Floating and Miscellaneous Boards, to the Distributors and to the Branch
Controllers.
3.2.1 Board Backplane
The Board Backplane (refer to Fig. 3.1, p.19) houses 16 96-pin EUROCARD connectors
for the boards’ power supply and 6 connectors to DC supply the fan tray unit.
The Board Backplane is powered by the Power Supply Backplane (refer to Section 3.4.1,
p.23) which is directly connected to the Power Supply Units.
3.2.2 High and Low Voltage, Floating and Miscellaneous boards
For further details, please refer to User’s Manual of the relevant model.
3.2.3 Distributors
For further details, please refer to User’s Manual of the relevant model.
3.2.4 Branch Controllers
For further details, please refer to User’s Manual of the relevant model.
3.3 Fan tray section
This section is located in the mainframe’s rear lower part and is housed in a 2U-high,
400-mm deep box (refer to Fig. 2.1, p.9 and Fig. 3.1, p.19). This section hosts six fans for