Danfysik SYSTEM 7000 User manual

SYSTEM 7000
CUSTOMER : _______________
OUTPUT DATA : _______________
ORDER NO : _______________
PART NO : _______________
SERIAL NO : _______________
AC INPUT : F3x208VAC excl Neutral
F3x208VAC incl Neutral
F3x400VAC incl Neutral
F3x415VAC incl Neutral
OUTPUT DATA : ±20A 35V or 75V
INTERFACE : FRS232 FRS422 FRS485
REV. By Date Description Pages
1.0 DT 09.06.2004 Initial All
1.1 DT 12.07.2004
Fast ADC and hardware
triggering 28-29
1.2 DT 15.03.2005
Partial reset to factory
settings 15
1.3 JFL 22.11.2005 Minor corrections All
1.4 JFL 18.10.2006
Minor corrections, 415
added All
M A N U A L
MAGNET POWER SUPPLY
SYSTEM 7000
DANFYSIK A/S !DK - 4040 Jyllinge !Denmark !Tel.: [phone] !Fax.: [phone]

IMPORTANT!
This documentation contains information which
is the property of DANFYSIK A/S, Denmark.
It is submitted to you in confidence that it will not be
disclosed or transmitted to others without DANFYSIK=s
authorisation.

MAGNET POWER SUPPLY SYSTEM 7000
1
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
Table of contents PAGE
1INTRODUCTION AND SPECIFICATIONS ....................................................................................... 3
1.1 GENERAL INTRODUCTION ............................................................................................................... 3
1.2 SPECIFICATIONS .............................................................................................................................. 4
1.3 WARRANTY AND WARRANTY REPAIR ............................................................................................. 5
2UNPACKING AND INSTALLATION................................................................................................. 6
2.1 RECEIVING THE GOODS ................................................................................................................... 6
2.2 INSTRUCTIONS FOR UNPACKING...................................................................................................... 6
2.3 INSTALLATION REQUIREMENTS....................................................................................................... 6
2.4 INSTALLATION................................................................................................................................. 7
2.5 MASTER CONFIGURATION (NO PARALLEL UNITS CONNECTED) ...................................................... 7
2.6 MASTER/SLAVE CONFIGURATION (TWO OR MORE UNIT IN PARALLEL) ......................................... 8
2.7 RS422 OR RS485 MULTIDROP CONFIGURATION............................................................................. 9
3OPERATING INSTRUCTIONS ......................................................................................................... 10
3.1 SWITCHING ON .............................................................................................................................. 10
3.2 MAIN POWER ON, OFF, STB &RESET ......................................................................................... 10
3.3 LOCAL /REMOTE CONTROL........................................................................................................... 12
3.4 CURRENT SETTING......................................................................................................................... 12
3.5 SETTING UP THE MPS.................................................................................................................... 12
3.6 DATA COMMUNICATION................................................................................................................ 14
3.6.1 Termination using RS 422 or RS 485................................................................................... 15
3.6.2 Partial reset to factory settings.............................................................................................. 15
3.7 PROGRAMMING ............................................................................................................................. 16
3.7.1 Software Profile Programming............................................................................................. 18
3.7.2 Equal time slot ramp profile method .................................................................................... 18
3.7.3 SW limits.............................................................................................................................. 19
3.8 SW COMMANDS ............................................................................................................................ 20
4THEORY OF OPERATIONS.............................................................................................................. 22
4.1 INTRODUCTION.............................................................................................................................. 22
4.1.1 SYSTEM 7000 Interface specification:................................................................................ 23
4.2 DISPLAY CONTROLLER MODULE. .................................................................................................. 27
4.2.1 Micro-Processor ................................................................................................................... 27
4.2.2 Display.................................................................................................................................. 27
4.2.3 DAC circuit .......................................................................................................................... 27
4.2.4 Slow ADC circuit ................................................................................................................. 28
4.2.5 Voltage reference.................................................................................................................. 28
4.2.6 Fast ADC for reading/displaying of output current.............................................................. 28
4.2.7 DC/DC Converter:................................................................................................................29
4.2.8 Serial Interface: .................................................................................................................... 29
4.2.9 Front Panel Interface specification:...................................................................................... 30
4.3 POWER AMPLIFIER MODULE: ........................................................................................................ 31
4.3.1 Power Amplifier Interface specification:.............................................................................. 31
4.3.2 ON/OFF/STANDBY control................................................................................................ 33
4.3.3 Interlock and ON/OFF/STANDBY status............................................................................ 34
4.3.4 Over Current Interlock..........................................................................................................34
4.3.5 Out of Regulation Status ...................................................................................................... 34
4.3.6 Power Output Over Voltage Interlock.................................................................................. 34
4.3.7 Converter Over Voltage Interlock ........................................................................................ 35

MAGNET POWER SUPPLY SYSTEM 7000
2
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
4.3.8 Over Temperature Interlock ................................................................................................. 35
4.3.9 PS Fan Fault Interlock ..........................................................................................................35
4.3.10 Ground Fault Interlock ......................................................................................................... 35
4.3.11 Soft start ............................................................................................................................... 36
4.3.12 Analog local/remote current set point controls..................................................................... 36
4.3.13 Slew Rate limit ..................................................................................................................... 36
4.3.14 Current limit ......................................................................................................................... 36
4.3.15 Summed Measured Current .................................................................................................. 36
4.3.16 Summed Current Error ......................................................................................................... 37
4.3.17 Analog measurements........................................................................................................... 37
4.3.18 Current Regulation ............................................................................................................... 38
4.3.19 Current Error Amplifier........................................................................................................ 39
4.3.20 Power Amplifier ................................................................................................................... 39
4.3.21 Load Dump........................................................................................................................... 40
4.3.22 Auxiliary Voltage and Ground planes .................................................................................. 40
4.3.23 Current Transducer............................................................................................................... 40
4.4 AC/DC CONVERTER MODULE ...................................................................................................... 42
4.4.1 AC/DC Converter Interface specification ............................................................................ 43
4.4.2 Auxiliary Power.................................................................................................................... 43
4.4.3 Current mode Push-Pull regulator ........................................................................................ 44
4.4.4 Pulse Width Modulator module............................................................................................ 44
4.4.5 FET Gate driver.................................................................................................................... 45
4.4.6 Power output stage ............................................................................................................... 45
4.4.7 Power Transformer...............................................................................................................45
4.4.8 Output filter .......................................................................................................................... 46
5MAINTENANCE ................................................................................................................................ 47
5.1 INTRODUCTION.............................................................................................................................. 47
5.2 PREVENTIVE MAINTENANCE ......................................................................................................... 47
5.3 ADJUSTMENT AND CALIBRATION .................................................................................................. 47
6TROUBLE SHOOTING...................................................................................................................... 48
7DRAWINGS ........................................................................................................................................ 49
8PARTS LISTS...................................................................................................................................... 49
9PARTS LISTS STRUCTURE ............................................................................................................. 49

MAGNET POWER SUPPLY SYSTEM 7000
3
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
1Introduction and specifications
1.1 General introduction
The SYSTEM 7000 is a DC constant current output Power Supplies designed for applications
requiring very high stability and low noise combined with reliability and ease of operation.
The SYSTEM 7000 is aimed at correction magnets in ion beam applications. It is the result of
an intensive development effort at Danfysik based on twenty years of experience in delivering
precision DC Power supplies to industrial and research laboratory users around the world.
Up to five SYSTEM 7000 units can be connected in a parallel Master/slave configuration. All
analogue signals are summed in the master unit. The master unit monitors and controls the
parallel connected slave units.
•Current stability options of 100 ppm classes
•Power outputs up to 1.5 kW per unit and 7.5kW with 5 units in parallel
•Output current (maximum) up to 20 A Bipolar per unit and 100 A with 5 units in parallel
•Local controlled or Remote controlled through a RS232, RS422 or RS485 serial interface
line.

MAGNET POWER SUPPLY SYSTEM 7000
4
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
1.2 Specifications
STABILITY CLASS . . . . . . . . . . . . . . 100 ppm
DC OUTPUT RATINGS:
Power range . . . . . . . . . . . . . . . . . 1500W
Voltage . . . . . . . . . . . . . . . . . . . . . 75V
Current range . . . . . . . . . . . . . . . . 20 A
PERFORMANCE:
All drift and regulation data are given for max.
Current output.
Warm up time. (Cold start) 30 min
Warm up time. (With control power ON). 30 min
Drift:
Long term 8 hours. 100ppm
Line regulation:
+/- 10 % slow. T > 1 min. Na
+/- 1 % fast. T > 3 ms. Na
Load regulation:
+ 10 % resistance change. T > 1 min. Na
Number of output channels: . . . . . . . . . . . 1.
Output polarity: . . . . . . . . . . . . . BIPOLAR.
TEMPERATURE RATINGS:
OPERATING. Centigrade.
Ambient temperature. 0 to 40
STORAGE temperature -20 to 50
MAIN COOLING SYSTEM.
Air cooling 0 40
AC SUPPLY POWER.
MAINS VOLTAGE:
See front page
AC voltage +/- 10 %.
48 - 62 Hz.
MAINS CURRENT:
. . 208VAC Up to 5,5 Amps pr phase
. . 400/415VAC Up to 2,75 Amps pr phase
OVERALL DIMENSIONS AND WEIGHT:
CABINET: MM
Height . . . . . . . . . . . . . . . . . . 132.5
Width . . . . . . . . . . . . . . . . . . . 480.3
Depth . . . . . . . . . . . . . . . . . . . 525
WEIGHT: (approx.) Kg
Net weight . . . . . . . . . . . . . . 25
Shipping weight . . . . . . . . . . . 27
INPUT/OUTPUT INTERFACES
Analogue 0±10VDC;
Set Current, Current- Current Error-Voltage-readbac
k
Digital 5V TTL;
Control, Status, Interlock
LED INDICATIONS:
Status ON/OFF/READY/RESET
Fault Over-temp/Internal/AC/
Ground/External/Over
Voltage/Over Current
Control mode Remote and Local
7-segment display for indicating of:
Output Voltage
Output Current
COMPUTER INTERFACE:
RS232
RS422
RS485
LOAD:
Recommended below 500mH.
Loop might need adjustment to specific load.

MAGNET POWER SUPPLY SYSTEM 7000
5
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
1.3 Warranty and warranty repair
DANFYSIK A/S warrants that the products manufactured by us will be free from defects in
material and workmanship that adversely would affect the normal functioning of the unit, for a
period of 18 months from the date of shipment or 12 months from the date of installation
whichever occurs first.
The exemptions to this are:
a) Parts not manufactured by DANFYSIK A/S which are covered by the original
equipment manufacturer's warranty.
b) Repair work, which is warranted for six (6) months from the date of shipment from
the DANFYSIK works.
DANFYSIK A/S will repair or replace either on site or at the factory, at option, any equipment
which proves to be defective within its warranty period.
In the case of warranty, DANFYSIK A/S will pay or reimburse lowest freight rate (two-way) of
any item returned to DANFYSIK or our designated agent/representative, provided that prior
written authorisation for such return has been given by DANFYSIK A/S.
This warranty shall not apply to any equipment, which has become defective or unworkable due to
mishandling, improper maintenance, incorrect use, radiation damage or any other circumstance not
generally acceptable for equipment of a similar type.
On standard products, DANFYSIK A/S reserves the right to make changes in design without
incurring any obligation to modify previously manufactured units.
The foregoing is the full extent of this warranty, and no other warranty is expressed or implied. In
no event shall Danfysik be liable for special damages arising from the delivery, late delivery or use
of the equipment.
If any fault develops, the following steps should be taken.
Notify DANFYSIK A/S, giving full details of the problems, and include Model-Type and Serial
number.
On receipt of these information, DANFYSIK A/S will give you either service information or
instructions for shipping.
All shipments of DANFYSIK equipment should be made according to our instructions and shipped
in the original or a similar container.
For smaller parts a carton will be sufficient, if the parts are wrapped in plastic or paper and
surrounded with at least 10 centimetres of shock-absorbing material.

MAGNET POWER SUPPLY SYSTEM 7000
6
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
2Unpacking and installation
2.1 Receiving the goods
The Shipping container and the Power Supply should be thoroughly inspected for signs of
obvious physical damage immediately upon receipt.
All materials in the container should be checked against the enclosed packing list.
DANFYSIK A/S will not be responsible for shortages against the packing list unless notified
immediately.
2.2 Instructions for unpacking
The Power Supply is shipped in reinforced cardboard.
If the equipment is damaged in any way, a claim should be filed with the shipping agent, and a
full report of the damage should be forwarded to DANFYSIK A/S or our local agent/-
representative immediately.
Upon receipt of this report, you will be issued instructions for the repair, replacement or return
shipment.
Please include the Model no, Type no, Serial no, and Order no for the Power Supply on any
communication with DANFYSIK A/S or our representative.
2.3 Installation requirements
During installation of the Power Supply, local rules and regulations for electric power supplies
should be respected and the following conditions and installations should be available.
* A normal, dust free room with humidity not above 80 % and a room temperature within 0 to
40 centigrade.
* Three-phase Mains voltage including neutral (except 208V excl. neutral) switched and
fused.
* Ground connection according to the local authority regulation and the requirements for the
equipment.
Please see specification sheet chapter 1.2 in this manual for actual figures for this power
supply.

MAGNET POWER SUPPLY SYSTEM 7000
7
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
2.4 Installation
Before and during installation of the Power Supply, the following points should be checked /
carried out.
* Check that the main voltage and frequency matches to the specified and labelled
requirements.
* Check that screw connections from the output terminals are tightened.
* Check that all screws on D-sub connectors are tightened.
* If the External Interlock 1 is unused, then short-circuit the terminals.
* If the External Interlock 2 is unused, then short-circuit the terminals.
* If the External Interlock 3 is unused, then short-circuit the terminals.
* If the External Interlock 4 is unused, then short-circuit the terminals.
2.5 Master configuration (No parallel units connected)
•The Master/ Slave slide switch, located in the back of the cabinet, must be set to Master.
•Connect Analogue or Digital interface remote control cable if applicable.
•Connect the termination plug in the “Parallel unit to slave” DB25 male connector located on
the back of the cabinet. (Pin 1 & 2 shorted).

MAGNET POWER SUPPLY SYSTEM 7000
8
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
2.6 Master/ Slave configuration (two or more unit in parallel)
•The Master / Slave slide switch located on the back of the supply must be placed in Master
position for the master unit and in slave position for all the other units. Only one SYSTEM
7000 must be configured as master.
•Connect the “Parallel unit” interface cable between the “Parallel unit to slave” DB25 male
plug of the first unit (normal master) to the “Parallel unit to master” DB25 female plug of
the next unit and so on in a daisy chain. The first unit must have the termination plug
connected to the “Parallel unit to master” and the last unit must have the termination plug
connected to the “Parallel unit to slave”.
•Not used external interlocks must be short-circuited.
Analog
Parallel units
to slaves
Parallel units
to master
External Interlocks
Digital
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Analog
Parallel units
to slaves
External Interlocks
Digital
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Analog
Parallel units
to slaves
External Interlocks
Digital
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Parallel units
to master
Parallel units
to master
Master Slave
Master Slave
Master Slave
Master
Slave
Slave
Termination plug
Example of a Master/Slave configuration with two slaves

MAGNET POWER SUPPLY SYSTEM 7000
9
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
2.7 RS422 or RS485 Multidrop configuration
Up to 32 SYSTEM 7000 units can be connected in a RS422 or RS485 multidrop configuration.
It is also possible to run a Master/Slave configuration within a multidrop system. All units
must be connected in order to read the individual unit interlock status signals, but for
controlling the system only the master connection is necessary. Trying to control one of the
slaves will have no effect as the control commands are disabled on the slaves. To set up the
Master/Slave configuration, see chapter 2.6.
•The Master / Slave slide switch located on the back of the supply must be placed in Master
position for all masters.
•Address all units with a unique address. See SW manual doc- ApBCPsw1c.doc on how to set
up the unit address.
Analog
Parallel units
to slaves
Parallel units
to master
External Interlocks
Digital
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Analog
Parallel units
to slaves
External Interlocks
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Analog
Parallel units
to slaves
External Interlocks
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Parallel units
to master
Parallel units
to master
Master Slave
Master Slave
Analog
Parallel units
to slaves
Parallel units
to master
External Interlocks
Digital
AC Main Power
External trig
Factory Program MPS status
Current
Output
Ground
fuse
Ac control input
Rack Fan
Master Slave
Digital
Digital
MPS no. 1
addresse : X
MPS no. 2
addresse : X+1
MPS no. 3
addresse : X+2
MPS no. Y
addresse : X+(Y-1)
X :Start address
Y : The last unit of MPS on the
multdrop line
Master Slave
Digital
Example of multidrop configuration
About the termination of RS422 or RS45, see chapter 3.6.1 “Termination using RS422 or
RS485”

MAGNET POWER SUPPLY SYSTEM 7000
10
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3Operating Instructions
This chapter describes how to operate the power supply in the local as well as in the remote
mode. It also identifies the controls and the indicators on the front panel.
3.1 Switching on
After connecting the Power Supply to the mains (line) voltage in accordance with chapter 1.2,
2.3 and 2.4, it can be switched ON.
_ Switch the main power ON
_ Set control mode to LOCAL
_ If the sum Interlock indication is set (red LED illuminates in the RESET button), press
this button to clear it. If it can’t be cleared, interlocks are present and must first be
resolved.
3.2 Main power ON, OFF, STB & Reset
The power supply can be set to three different modes for turning the power supply ON and
OFF given as below.
0) Direct ON & OFF (default mode)
1) Standby mode 1
2) Standby mode 2
The desired working mode can be selected using the ‘esc’<NFSMODE command. See the
software description for setting up the power supply and for further detail of this issue.
The working principle of the different modes is described through following state diagrams.
The circles are the state and the arrow lines are witch button, command or event that initiates
the state shift.
Mode 0 – Direct ON & OFF
This mode is the default mode. It is
characterized by the power supply is either in the
ON or in the OFF state or if an interlock is
present in the FAULT state.
State FAN Output
Converter
OFF OFF Not Powered
ON ON Powered
FAULT ON Not Powered
ON-S
INTL
ON
OFF
OFF-S
AC Power
ON
RESET
FAULT
RES
{no INTL}
INTL
{event} Else
Else
OFF
Off = Reset}
{no INTL &

MAGNET POWER SUPPLY SYSTEM 7000
11
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
Mode 1 – ON & OFF through STANDBY
In this mode the power supply must first be set into
the stand by state before entering the ON or OFF
state. An interlock puts the power supply immediately
in the FAULT state.
In the stand by mode is the output converter without
power.
State FAN Output
Converter
OFF OFF Not Powered
ON ON Powered
STB-1 ON Not Powered
FAULT ON Not Powered
Mode 2 – ON & OFF through STANDBY
This mode can be seen as a mixture of mode 0 and
1. Here the inserted stand by mode is actually
nearly the same as the ON state but with the output
forced to zero (compared to mode 0). An interlock
puts the power supply immediately in the FAULT
state.
In the stand by mode the output converter is with
power but forced to zero output.
State FAN Output
Converter
OFF OFF Not Powered
ON ON Powered
STB-2 ON Powered
FAULT ON Not Powered
The STB transition is locally initiated by pressing
the reset button and thereafter at the same time the
ON button. Remotely the STB command must be
issued.
The LED inside the Reset push button indicated that the Power Supply is interlocked either due
to an internal or external fault.
ON-S
STB-1
INTL
{event}
ON
RES
FAULT
RES
{no INTL}
OFF
Else
OFF
OFF
INTL
{event}
A
C Power
ON
OFF-S
RES
{no INTL}
Else
Else
INTL
{event}
ON-S
STB-2
INTL
{event}
ON
STB
FAULT
OFF
Else
OFF
AC Power
ON
OFF-S
STB
INTL
{event}
{Out-Dis}
RES
{no INTL}
ON
INTL
{event}
Else
Else
Else

MAGNET POWER SUPPLY SYSTEM 7000
12
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.3 Local / Remote control
The LED “Remote” illuminates, when the Power Supply is in the REMOTE control mode and
is off in LOCAL control mode.
The control mode (LOCAL/REMOTE) is changed by pushing the "Remote" push button if the
MPS is not locked to remote line.
SYSTEM 7000 operating front panel
3.4 Current setting
In local:
The output current level can be displayed by pushing the “SET” button.
The output current display consists of six 7-segment LEDs. The left segment shows the sign. For
negative set values a minus sign will be displayed and for positive set values no sign will be
displayed. The other Segments display the set value. Each segment can be altered individually
with the up/down button. To select which segment to alter, use the forward/back button. The
chosen segment will flash.
3.5 Setting up the MPS
Two dip-switches are available for setting up of the power supply.
35V / 75V setup
The analogue ±10V output voltage read back can be scaled for either 35V or 75V
Factory settings are indicated on the back of the SYSTEM 7000 cabinet.
Output Voltage →35V 75V
P803 SW1 Closed Open
P901 SW1 Closed Open
P901 SW2 Closed Open
Bandwidth setup
For highest stability and fastest response time, the load impedance transfer function is incorporated
in the total loop gain. Therefore it is necessary to adapt the internal gain and frequency response of
the loop to match the actual connected load.
The current loop gain can be change between 1, 5 and 10 on switch P302. (1, 14 and 20dB)
The lowest loop pole can be shifted a decade upwards with switch P306.

MAGNET POWER SUPPLY SYSTEM 7000
13
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
Gain factor: →1 5 10 (factory)
P302 SW1 Closed Closed Open
P302 SW2 Closed Open Open
Frequency Pole →Low (factory) High
P306 SW1 Closed Open
Current / Voltage mode
This switch setting is for internal use and debugging only by authorized Danfysik service
personnel. In general it sets the unit to a voltage supply where a 20A (full scale) setting gives a
voltage output of approximately 35V.
Loop mode →Current mode (factory) Voltage mode
P305 SW1 Open Closed
P305 SW2 Closed Open
Hint:
The time constant of the magnet (transfer function of the load) can be measured, using
the SYSTEM 7000 in the voltage mode together with an attached gain/phase analyser.
Machine Protection System signal
The Machine Protection System signal (Abbreviated to “M.P.S. signal”) is available through an
Amphenol connector located on the back of the cabinet. This signal is produced by AND’ing;
the three signals; ON status, Sum Interlock and the Main contactor is on.
The M.P.S. signal is high when the SYSTEM 7000 is ON.
Sum interlock and the ON status can be excluded from the “M.P.S. signal”
Sum Interlock/ ON Status Enable / Disable
Switch ↓Signal name ↓Enabled (factory) Disabled
P702 SW1 Sum interlock Closed Open
P702 SW2 ON status Closed Open
Interlock enable – disable - rerouting
Two interlocks (Ground Fault Interlock, Over Voltage) and one status signal (Out of
regulation) can be disabled if not desired.
Interlock/ Status Enable / Disable
Enable Disable
P801 SW1 Interlock Ground Fault Open (factory) Closed
P801 SW2 Status Out of regulation Open (factory) Closed
P803-SW2 Interlock Over voltage Open (factory) Closed

MAGNET POWER SUPPLY SYSTEM 7000
14
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.6 Data communication
The SYSTEM 7000 uses the standard serial interface RS232 and RS422 which is compatible
with many computers and terminals. The RS422 may be configured in a multidrop system.
RS485 is only supported under certain conditions. See description below.
The connector labeled “digital” is the remote serial interface port.
Pin description for the “digital” port (DB25) located at the back of the power supply.
RS232 remote line
DB25
RS422/485 remote line
DB25
Pin No. Signal Pin No. Signal
2 Tx 25 RETURN
3 Rx 9 Tx High
25 RETURN 10 Tx Low
11 Rx High
12 Rx Low
Rx : Signals received by the Control Module from its host.
Tx : Signals transmitted by the Control Module to its host.
NOTE! The selection between RS232, RS422 and RS485 is selected through straps on the
Display Controller Module.
Serial bus Strap ST2 Strap ST3 Strap ST4 Strap ST10
RS232 Open Open Close Open
RS422 Open Close Open Open
4-Wire RS485 Open Close Open Close
2-Wire RS485 Close Open Open Close
The default serial setting is :
8 BIT DATA, NO PARITY AND 2 STOPBIT and baud rate 9600.
The communication is done by transmitting characters in ASCII code terminated by
CARRIAGE RETURN.
The termination characters from the Power Supply are LINE FEED and CARRIAGE
RETURN.
An ERROR message includes a "?BELL". (Bell = ASCII 7.)
NOTE! None of the serial lines has control signals.
RS485 communication.
RS485 is only supported under certain conditions. These are:
- Disable Line turn around time: Minimum 2ms. (Time for the transmitters to tri state)
- Answer Line turn around time: Minimum 100µs t (Time after receiving the last bit of the
transmission until an answer is initiated “active transmitter”.)

MAGNET POWER SUPPLY SYSTEM 7000
15
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.6.1 Termination using RS 422 or RS 485
As standard there is no termination resistors connected inside the display controller module. An
external termination resistor of 100 Ohm must therefore be added at the end of the
communication cable or the internal 100 ohm resistor must be enabled (short-circuiting strap
ST9). The external resistor is preferable.
Hint. This resistor can be placed inside the last DB 25 plug for the remote line.
When using the RS 485 or the RS 422 line in the multi drop configuration, it is very important
during an address transfer to leave the lines at the "SPACE" state when tri stated. That is when
the line is not driven by any transmitters at all. The "SPACE" state can be utilized by adding
1K Ohm resistors to +5V (non inverting) and GND (inverting) on both the transmit and the
receive lines. The display controller module can provide this by short circuiting ST5-ST8 (use
a thin soldering iron). The 1K resistors increase the noise immunity eliminating noise to be
treated as commands thereby flawing the first character after being addressed.
3.6.2 Partial reset to factory settings
From firmware release version BCP V1.07
The partial reset to factory settings resets the baudrate and address setting to factory default.
This feature can be used when the baudrate or/and address is unknown and the operator no
longer is able to communicate with the MPS.
To activate the partial reset to factory settings, do following on the front panel (picture of front
panel, see page 12)
1. Hold the “▲” (up) and “▼” (down) buttons for min. 5 sec.
2. Release the buttons and the baudrate and address are reset to factory settings.
After partial reset, the setting for baudrate is:
8 BIT DATA, NO PARITY AND 2 STOPBIT and baud rate 9600
and the address is : 0

MAGNET POWER SUPPLY SYSTEM 7000
16
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.7 Programming
The power supply communication protocol is build upon plain ASCII characters where each
command or reply is delimited by a "Carriage Return" <CR> character. However a reply has a
“Line Feed” <LF> character added before the <CR> for a friendlier display when using a
terminal. <LF> characters on commands will be ignored.
Hint. Actually the protocol allows full control of the power supply from a "dumb" terminal. In
case of a service- debug- situation a terminal can be used to tap the communication
transfer by a simple parallel connection.
Hint: When debugging, the "ERRT" command enables error messages to be given as a read
able text.
More commands may be transmitted in a chain but each single command must be trailed
individually with the delimiter character <CR>. The power supply is able to execute up to 200
commands a second depending of the complexity of each command.
Ps. Issuing short commands faster than the time to transmit the answer e.g. “S1" will
overload the internal transmit buffer regardless of the selected baud rate.
All commands can be divided into three sections.
a) Directive commands. Eg. the "N" command that turns the power supply ON
b) Status commands . Eg. the "S1" that returns the power supply status
Status commands delivers always a reply whereas directive- and setup- commands only
responds with an error message if the command couldn’t be understood or if the given
parameters are incorrect. It is possible to set the power supply to always generate an
answer. This feature is very useful when using RS485 protocol.
Hint. When using the "OK Answer" mode a retransmission of the last given command can be
performed if no answer or an error message is received. The System 7000 respond time
is around 5ms after receiving the last bit of the termination character.
Answer scheme if set to “Always Answer” mode.
c) Directive commands.Answer: - No answer
- ERROR message
- OK if set to OK answer mode
d) Status commands . Answer: - Data
- ERROR message
e) Set up commands. Answer: - No answer
- ERROR message
- OK if set to OK answer mode
Ps. An error message is generated immediately when an error is detected although the
command isn’t fully transmitted.

MAGNET POWER SUPPLY SYSTEM 7000
17
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
Below is an example written in BASIC on how to turn ON the power supply and read the status
without and with acceptance answer:
Turning the power supply ON and reading/evaluating the status with always answer disabled.
LPRINT "N"+CHR$(13) :REM Turns the power supply on
LPRINT "S1" :REM Issues the status command
LINPUT S1$ :REM Read the MPS reply
IF LEFT$(S1$,1) = CHR$(?) :REM Is it an error message reply?
GOTO ERROR_HANDLING :REM Yes then go to error module
ENDIF
J=1
DO :REM evaluate status reply
IF MID$(S1$,J,1)="!"
GOSUB STATUS(J)_ACTIVE :REM set this status bit active
ELSE
GOSUB STATUS(J)_ACTIVE :REM set this status bit inactive
ENDIF
J=J+1
UNTIL J=24
Turning the power supply ON with always answer enabled
J=0 :ERROR$=”“
DO
J=J+1 :REM Counter for maximum attempts
LPRINT "N"+CHR$(13) :REM Turns the power supply on
LINPUT RE$ :REM Read the MPS reply with 0.1 Sec. time out
IF LEFT$(RE$,1) = CHR$(?) :REM Is it an error reply?
ERROR$=RE$ :REM Mark the error code
ELSEIF RE$=”OK” :REM Is it a good reply
BRAKE :REM then exit DO loop
ELSEIF J=6 :REM Try only six times
IF LEFT$(ERROR$,1) = CHR$(?) :REM Was it error reply?
GOTO ERROR_HANDLING:REM Yes then go to error module
ELSEIF
GOTO NO_COMMUNICATION :REM Yes then go to “No answer” error module
ENDIF
ENDIF
UNTIL -1 :REM loop endless
Ps. An ERROR message includes a "?BELL". (Bell = ASCII 7.)

MAGNET POWER SUPPLY SYSTEM 7000
18
DANFYSIK A/S - DK 4040 JYLLINGE - DENMARK.
3.7.1 Software Profile Programming
SYSTEM 7000 is delivered with the software profile option.
With the ramp profile SW it is possible to down load and run a predefined ramp sequence that
the output current must follow. The SYSTEM 7000 supports Equal timeslot method.
The examples below are shown for a uni-polar profile. For bipolar profiles, the output current
may also be set as negative.
3.7.2 Equal time slot ramp profile method
With the ”Equal time slot method” it is possible to download up to 512 current set values and a
single time slot value, that will be used for all set values. Only one stack is available.
This profile method is especially useable for faster and more accurate curves fitting profiles
e.g. as a function generator.
To use the Equal time slot method at least the following steps must be preformed:
- Clear and set the stack “RAMPSET [parameter]”,- Program the stack “R [parameter]”, -Start
the stack “RAMP [parameter]”, -Read the status of the running stack “RAMP".
PS. All values must be given as a floating point number scaled to “1.00000". That is; 2.5ms
must be entered as 0.00250 and 19.54% output current as 0.1954.
Please refer to ApBCPsw1a.doc Software commands for full instructions.
The figure below shows an example of one ramp profile stack. (Ps. not all 512 points need to
be programmed, empty entries will be ignored.)
The time slot must be given as a multiple of 2.5ms. Between 2.5ms to 1 second. Any value in-
between will automatically be rounded according to formulae:
{time slot}=frac({time}/0.00250)*0.00250
Time Slots
Output
Current
Time
From
TRIG
Software Ramp Profile
1234
15 20
26 27
Incremental
525
10
Equal Time Slot Method