EPS RS 232, RS 485 User Manual

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EPS Stromversorgung GmbH

Telefon +49 (0)821 570451-0

Electronic Power Supplies

Fax +49 (0)821 570451-25

Alter Postweg 101

[email protected]

D-86159 Augsburg

www.eps-germany.de

M a n u a l

E P S / M P

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Page 4

Software version: V21 June 2014

Page 5

Technical Specifications

Table of Contents

Technical Specifications .............................................................................................................................................. 4

Ambient Conditions ............................................................................................................................................................ 4

Input Specifications ............................................................................................................................................................ 4

Output Specifications ......................................................................................................................................................... 4

AI Interface ......................................................................................................................................................................... 5

RS 232 ................................................................................................................................................................................. 5

RS 485 ................................................................................................................................................................................. 5

Technical Drawing ............................................................................................................................................................... 6

Important Safety Instructions ..................................................................................................................................... 7

Initial Operation .................................................................................................................................................................. 7

Unpacking ........................................................................................................................................................................... 7

Setting Up ........................................................................................................................................................................... 7

Visual Inspection ................................................................................................................................................................. 7

Mains Operation ................................................................................................................................................................. 7

Functional Description ................................................................................................................................................ 8

General Settings ......................................................................................................................................................... 9

Front Panel Description ...................................................................................................................................................... 9

Configuration ...................................................................................................................................................................... 9

Contrast ............................................................................................................................................................................ 10

Voltage Settings........................................................................................................................................................ 10

limit

and I

limit

..................................................................................................................................................................... 10

OVP (Over Voltage Protection) ......................................................................................................................................... 10

AI-Type .............................................................................................................................................................................. 10

Remember Last Setting ..................................................................................................................................................... 10

Interface parameter (Option) ........................................................................................................................................... 10

Front Panel Operation .............................................................................................................................................. 11

Display and Settings .......................................................................................................................................................... 11

Current measurement values (Display) ................................................................................................................... 11

Main display ............................................................................................................................................................ 11

Operating modes .............................................................................................................................................................. 12

Main display overview ............................................................................................................................................ 12

Operating Mode description ................................................................................................................................... 13

Universal interface (Option) ..................................................................................................................................... 14

Commands ........................................................................................................................................................................ 14

Format ..................................................................................................................................................................... 14

Instruction Set ......................................................................................................................................................... 15

Quick view of commands ........................................................................................................................................ 15

Detailed description of commands ......................................................................................................................... 16

Response String ....................................................................................................................................................... 24

Ext. Control: Computer ............................................................................................................................................. 25

GPIB .................................................................................................................................................................................. 25

Status Word............................................................................................................................................................. 26

ESR-Register - Event-Status-Register....................................................................................................................... 26

RS232 interface ................................................................................................................................................................. 26

Interface Reconfiguration ....................................................................................................................................... 28

RS485 Interface ................................................................................................................................................................. 28

Interface Reconfiguration ....................................................................................................................................... 29

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Technical Specifications

Ext. Control: AI Interface (Option) .............................................................................................................................29

Pin Assignment AI Interface .............................................................................................................................................. 30

Analog Input ..................................................................................................................................................................... 30

Set Point U (U

Set

) ..................................................................................................................................................... 30

Set Point I (I

Set

) ........................................................................................................................................................ 31

Set Point OVP (U

OVP

) ................................................................................................................................................ 31

Analog Output .................................................................................................................................................................. 31

Monitor Set Point U (U

mon

) ...................................................................................................................................... 31

Monitor Set Point I (I

mon

) ......................................................................................................................................... 31

Monitor Actual Value P (P

mon

) ................................................................................................................................. 31

Analog Output OVP (U

OVPmon

) .................................................................................................................................. 32

Monitor Output Voltage (U

Istmon

) ............................................................................................................................ 32

Monitor Output Current (I

Istmon

) .............................................................................................................................. 32

Digital Input ...................................................................................................................................................................... 32

Activation (Ext. Control) .......................................................................................................................................... 32

Soft-Interlock........................................................................................................................................................... 32

Blocking (Standby) ................................................................................................................................................... 32

Digital Output ................................................................................................................................................................... 32

Blocking (Standby) ................................................................................................................................................... 32

Const. Voltage mode (CV) ................................................................................................................................................. 33

Error .................................................................................................................................................................................. 33

Ext. Control: Ethernet (LAN) ......................................................................................................................................33

Manual Assignment of an IP under Microsoft Windows® ................................................................................................ 33

Monitoring the device via browser................................................................................................................................... 34

Controlling the device via Telnet ...................................................................................................................................... 34

Controlling the device via browser ................................................................................................................................... 35

Ext. Control: USB .......................................................................................................................................................35

Interface Reconfiguration ................................................................................................................................................. 35

Data Log Function (Option) ........................................................................................................................................36

Format of the saved Data ................................................................................................................................................. 36

Script Mode ...............................................................................................................................................................36

Executing/Loading a Script ............................................................................................................................................... 36

Commands ........................................................................................................................................................................ 37

Syntax ...................................................................................................................................................................... 37

Quick view of commands ........................................................................................................................................ 37

Detailed description of commands ......................................................................................................................... 37

Controller ..................................................................................................................................................................41

Controller Structure PVsim Mode and User Mode ........................................................................................................... 42

Controller Structure UIP Mode ......................................................................................................................................... 42

Controller Structure UIR Mode ......................................................................................................................................... 42

Controller parameters ...................................................................................................................................................... 43

Sense Mode ...............................................................................................................................................................44

Load connection without Sensor Conductor .................................................................................................................... 44

Load Connection with Sensor conductor .......................................................................................................................... 44

Load Distribution without Sensor Conductor ................................................................................................................... 44

Appendix ...................................................................................................................................................................45

Equivalent leakage current measurement according to VDE 0701 .................................................................................. 45

Notes .........................................................................................................................................................................47

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Technical Specifications

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Technical Specifications

TECHNICAL SPECIFICATIONS

MBIENT CONDITIONS

Cooling

Fan

Operating temperature

0 - 50 °C

Storage temperature

-20 - 70 °C

Humidity

< 80 %

Operating altitude

< 2000 m

Vibration

10 - 55 Hz/1 min/2G XYZ

Shock

< 20 G

Weight

5 kW 19 kg, 10 kW 26 kg, 15 kW 33 kg

NPUT SPECIFICATIONS

EPS/MP models (by max output power)

1.2 kW 2.4 kW

Connection

3 wire (1P+N+E)

AC socket on rear panel

IEC-C14 IEC-C20

Input voltage

230 Vac, 50/60 Hz (207-253 Vac 47-63 Hz)

Input current

1,2

≈ 6.5 A

≈ 13 A

Inrush transient current2

≈ 25 A

Main input fuse rating

10 A

16 A

Main input fuse type and location

built-in fast acting PCB mounted cartridge fuse

Recommended supply breaker value & curve

16 A type D 16 A type D

Leakage current

≈ 1.5 mA

THD input current

≈ 3.75 %

≈ 10.75 %

THD input voltage

≈ 1.87 %

≈ 2.55 %

Power factor

≈ 0.99

Efficiency type 1

≈ 88 % (with PFC)

≈ 89 % (with PFC)

Dissipated power 1

≈ 165 W

≈ 350 W

UTPUT SPECIFICATIONS

Static voltage regulation

± 0.05 % + 2 mV

Static current regulation

± 0.1 % + 2 mA

Dynamic regulation

< 1-3 ms (typ.)

Ripple

< 0.2 % RMS (typ.)

Stability

± 0.05 %

Programming accuracy (V

out

)

± 0.05 % +2 mV

Programming accuracy (I

out

)

± 0.05 % +2 mA

Display accuracy (V

out

)

< ± 0.5%

Display accuracy (I

out

)

< ± 0.5%

Isolation

3,000 V

Over voltage protection

0 - 120 % V

max

Circuit protection

OC/OV/OT/OP

Line regulation

< ± 0.1 % + 2 mV

for nominal output voltage and nominal output current

for nominal input voltage

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Technical Specifications

AI I

NTERFACE

Digital outputs (CV, Standby, Error)

Output type: Open collector with pull-up resistor 10 k after + 5 V I

sinkmax

: 50 mA

Digital inputs (Ext. Control, Standby)

Input resistance: 47 k

Ω

Maximum input voltage: 50 V High level: Ue > 2 V Low level: Ue < 0.8 V

Analog outputs (X

mon

)

Output resistance: 100

Ω

Minimum permissible load resistance: 2 kΩ Minimum load resistance for 0.1 % accuracy: 100 kΩ

Analog inputs (X

set

)

Input resistance: 1 M

Ω

Maximum permissible input voltage: 25 V

Reference voltage

Reference voltage U

ref

: 10 V ±

10 mV

Output resistance: < 10 Ω Maximum output current: 10 mA (not short-circuit-proof)

5 V - Supply voltage

Output voltage: 5 V

300 mV

Maximum output current: 50 mA (not short-circuit-proof)

RS 232

Signal inputs (RxD, CTS)

Maximum input voltage:

25 V

Input resistance: 5 kΩ (Type) Switching thresholds: UH < - 3 V, UL > + 3 V

Signal outputs (TxD,RTS)

Output voltage (at R

Last

> 3 k

Ω): min

5 V, Type

9 V, max

10 V

Output resistance: < 300 Ω Short circuit current: Type ± 10 mA

RS 485

Maximum input voltage

± 5 V

Input resistance

> 12 kΩ

Output current

± 60 mA Max

High level

Ud > 0.2 V

Low level

Ud < - 0.2 V

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Technical Specifications

ECHNICAL DRAWING

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Important Safety Instructions

IMPORTANT SAFETY INSTRUCTIONS

Ple ase re ad t h is ma nu a l tho rou ghl y bef or e putt ing the de vic e int o ope rat ion . Pay re g ar d to th e f o ll o wi ng sa f et y in str uct ion s and ke ep thi s m anu al nea rb y fo r f ut u re pu rpo se.

This operating manual is based on the state of technology at the time of printing. However, it is possible that despite regular control and correction, the present document contains printing errors or deficiencies. EPS Stromversorgung GmbH assumes no liability for any technical, printing or translational errors within this manual.

NITIAL OPERATION

NPACKING

Please make sure that the shipping carton and the packaging is free of damage. If external damage is found, it is important to record the type of damage. Please keep the original packaging to ensure the device is adequately protected in case it needs to be transported in the future or claims for compensation need to be asserted.

ETTING UP

To avoid electric shocks and product failure, the device should be installed in a temperature and humidity controlled indoor environment. The ambient temperature must not exceed 50 °C. The device must never be exposed to liquids or extreme humidity.

ISUAL INSPECTION

The unit must be examined immediately for defects or damages in transit. Damages caused during transport may be loose or broken control knobs and bent or broken connectors. Do not use the device if any physical damage is apparent. Please inform the carriers and a representative of EPS Stromversorgung immediately.

AINS OPERATION

Make sure to verify the model number and voltage stated on the nameplate. Damages due to wrong power feed are not covered by guarantee conditions.

The u nit m u st o n ly b e ope rat ed wh en co nn e ct e d dir ect ly to t he mai ns. To av oid da ma g e, do not c o nn e ct th e u nit to iso lat ing tra nsf or mer s, a uto -tr ans f or mer s, m ag n eti c c u rr ent lim ite rs or sim ila r d evi ces .

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Functional Description

FUNCTIONAL DESCRIPTION

The following block diagram gives information about the various adjustment options.

Basically, four different operation modes are available:

UI mode

Unit is operated with current and voltage limitation.

UIP mode

Unit is operated with current, voltage and power limitation.

UIR mode

Unit is operated with current, voltage and power limitation. Additionally, the set value for

voltage is calculated by means of the present output current to simulate an internal resistance.

Table mode

Set

values for current and voltage are saved in a table. Therefore, UI characteristics can be

easily adjusted.

There are three different ways to program the table:

sim

mode

The UI characteristic of a solar generator is calculated with the Uo, Ik, Umpp and

Impp

parameters and then written to the table.

Memory card

The table can be programmed using a script from a memory card.

A script is a simple text file ( Script Control).

Digital interface

The table can be programmed using the digital interface (



Universal Interface

WAVE

Command bzw. DAT Command).

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General Settings

The adjustment of set points and the selection of an operation mode are performed via console ( Front Panel Operation), interface ( Universal Interface) or analog/digital IO ( Ext. Control: AI-Interface).

In order of priority, commands which have been sent by interface come first, by analog/digital-IO come second and by keyboard come third. For example, if the interface specifies the set point, the corresponding values will be sent to the output, irrespective of other settings.

Another easy way to automate functions is offered by script control ( Script Control). A list of commands is saved to the script memory and enables the user to change the chronological sequence of certain settings. The script memory can be programmed via memory card or digital interface.

Measurement values of the latest output data are permanently available at all interfaces. Therefore, the present output voltage can be read from the display or via digital interface, while the control of the unit is carried out via analog/digital IO.

GENERAL SETTINGS

RONT PANEL DESCRIPTION

The picture above shows a schematic view on the front panel of the EPS/MP. There are 3 buttons to control the unit.

Basic functions of the control buttons:

Standby

release or lock the output, quit OVP

Display

short press: change displayed information, long press: change between main menu and setup menu

Select

press: change selected menu point, rotate: change selected value

ONFIGURATION

The configuration menu can be accessed by holding the button

Display

for at least 1 second. This opens a menu

where general settings of the unit can be changed. To browse through the different options, the button

Select

must

be pushed. To change a setting the button

Select

must be rotated.

Setup options:

limit

0 V-V

max

; set maximum output voltage which is selectable at the front panel

limit

0 V-V

max

; set maximum output current which is selectable at the front panel

OVP

0 V- 1.2 x V

max

; set over voltage protection activation value

AI-Mode

5 V/10 V; select the AI-control voltage range

Remember Last Setting

ON/OFF; activate or deactivate the settings memory after a power down the unit

The displayed temperature is the temperature of the heat sinks. Temperature 1 is the temperature of the PFC heat sink and temperature 2 is the temperature of the power unit heat sink.

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Voltage Settings

ONTRAST

After the unit has been switched on, the display shows the EPS logo. The contrast of the display can be adjusted by using the rotary pulse encoder

Select

. Afterwards, the contrast settings will be saved automatically.

VOLTAGE SETTINGS

LIMIT

AND

LIMIT

limit

limits the maximum output voltage. The output voltage is limited to the selected value, irrespective of the values that have been set at the front panel or at one of the interfaces. The adjustment range is 0 V up to the maximum rated voltage of the device.

limit

limits the maximum output current. The output current is limited to the selected value, irrespective of the values that have been set at the front panel or at one of the interfaces. The adjustment range is 0 A up to the maximum rated current of the device.

These settings can only be changed at the display and they apply to all interfaces.

OVP (O

VER VOLTAGE PROTECTION

)

The output is shut immediately if the output voltage exceeds the selected value. The display indicates this status with the word ‚OVP‘. To reset this error, push the button

Standby

. The OVP value applies to the front panel operation. There may apply different values for the AI-interface and the digital interface. The digital interface is initialized with the value which has been adjusted on the front panel. The adjustment range is 0 V up to the maximum rated voltage of the device + 20 %.

AI-T

YPE

This feature adjusts the voltage levels of analog input signals and analog output signals. Selectable ranges are 0-5 V and 0-10 V.

EMEMBER LAST SETTING

If this option is activated (‚On‘), selected parameters will be kept after a blackout. If this option is deactivated (‚Off’), standard setting (0V/0A/UI-Mode) will be loaded after supply voltage is enabled.

NTERFACE PARAMETER (OPTION

)

The display shows all available digital interfaces and their changeable parameters. To see interface parameters, push the button

Display

for 1 second. Push this button again to see the first interface and its changeable parameters,

which can be selected by pushing the rotary pulse encoder and changed by turning the rotary pulse encoder (function of the parameters  Universal Interface).

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Front Panel Operation

FRONT PANEL OPERATION

ISPLAY AND SETTINGS

Current measurement values (Display)

In normal mode, pushing the button

Display

switches between five different overview screens.

Main display

The main display shows current measure and set values. The display is divided in two separate displays. After enabling the unit, the measured values for output voltage and putput current (position 1 and 2) are displayed. On the right

display (position 6) the actual set value (Preset V

set

) is shown. To change this value, the rotary pulse encoder

Display

must be turned. Pushing the button

Select

, toggles through the next set parameters (in UI mode it will be output

current). To open the mode select menu (left display, position 3) where different operation modes are available, the button

Select

must be pushed again.

Selectable parameters according to operation mode:

Output voltage

Ouput current

Output power (UIP mode only  UIP mode)

Internal resistance (UIR mode only  UIR mode)

mpp

MPP voltage (PV

sim

mode only  PVsim mode)

mpp

MPP current (PV

sim

mode only  PVsim mode)

Selectable options in current control mode (left display, position 5):

Loc

Front panel operation

Scr

Memory card operation

Analog interface operation

Rem

Interface operation

LLO

Interface operation , Front panel operation locked

Dis

Unit locked via interlock input (option)

Available modes for operating status of the unit (left display, position 4):

STB

Standby mode

Voltage limitation mode

Current limitation mode

Power limitation mode

OVP

Deactivation of the unit by over voltage protection

Available operation modes of the unit (left display, position 3):

Voltage and current limitation

UIP

Voltage, current and power limitation

UIR

Voltage and current limitation, simulated internal resistance

sim

Simulation of a photovoltaic characteristic

User

Simulation of a user-defined characteristic

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Front Panel Operation

PERATING MODES

Main display overview

Main display 1

After power up, the display shows the actual output voltage and output current.

Main display 2

After pushing the button

Select

once, actual output voltage and output power are shown on the display.

Main display 3

After pushing the button

Select

twice, actual output power and output current are shown on the display.

Main display 4

After pushing the button

Select

thrice, actual output voltage and output current are shown on the left display and actual output power (P = U * I) and load resistor (R = V ÷ C) are shown on the right display. The values for power and resistor will be calculated from the actual values of the output voltage and the output current.

Main display 5/diagram screen

After pushing the button

Select

four times, actual output voltage and output current are shown on the left display. The output characteristic of the power supply is shown on the right display. The X-axis shows the output voltage and the Y-axis shows the output current.

The picture above shows the UIR mode of the power supply. The dot marks the actual operation point of the unit. The diagram is always scaled for the maximum allowed output current (this value can be set in the setup menu (I

limit

)) and

the maximum allowed output voltage (this value can be set in the setup menu (U

limit

)).

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Front Panel Operation

Operating Mode description

UI Mode

In UI mode, the set values for voltage and current are transferred directly to the switch mode regulator. There is no additional digital control.

UIP Mode

In UIP mode, the set values for voltage and current are transferred directly to the switch mode regulator. If the output current exceeds the previously adjusted limit value, the current set point will be regulated.

UIR Mode

In UIR mode, the voltage set point is regulated in a way that a power supply unit with (adjustable) internal resistance is simulated. The set value for current limiting is transferred directly to the switch mode regulator.

sim

Mode

In PV

sim

mode, the diagram of a PV generator is simulated. Given values are open-circuit voltage Uo, short-circuit current Ik, as well as the amounts of voltage and current by which the PV generator delivers the maximum power (U

mpp

, I

mpp

). Parameters can be found in the specification sheet of the simulated PV generator.

Values for U

mpp

may be in a range from 0.6 to 0.95 * U.

Values for I

mpp

may be in a range from 0.6 to 0.95 * I.

Script Mode

In script mode, the unit is controlled by memory card. The display status ‚Mode‘ shows the present operating mode ‚UI‘. The lower right corner of the display shows the word ‚Scr‘, which indicates that script operation was selected. If

there is no memory card in the slot, this option cannot be selected. For detailed information about memory card control and about how to build up a script, see  Script Control.

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Universal interface (Option)

UNIVERSAL INTERFACE (OPTION)

All interfaces of the digital interface are equal. There is no shift between the interfaces. For example, the first command can be issued via the IEEE interface while the second command can be issued via the RS232 interface. The return values will be sent from that interface the command was issued from.

OMMANDS

Communication is based on an ASCII protocol. The following chapters describe how to write a command and give an overview over the commands.

Format

A command consists of the command word, a parameter (if necessary) and a terminator. The character for the terminator is Carriage Return

<CR>

or Line Feed

<LF>

Character ASCII Dec value Hex value

Carriage Return

<CR> 13 0d

Line Fee

<LF> 10 0a

If the command contains a <DEL> or <ESC> character, it will not be processed. Therefore, a command can be cancelled while entering. Though, a terminator (

<CR>

<LF>

) is necessary.

Character ASCII Dec value Hex value

Escape

<ESC> 27 1b

Delete

<DEL> 127 7f

Commands are not case sensitive and may be mixed up. Therefore, the effect of the following commands is the same: GTL, Gtl, gTL. Decimal places are optional and separated by a full stop ‘.‘ . The number of decimal places is not limited. Therefore, the effect of the following commands is the same: UA,10, UA,10.0, UA,10.000000000, UA,0010, UA,010.0000

The number of decimal places to be analyzed depends on parameter and unit type. It corresponds to the number of decimal places, a command without a parameter would return. As a rule, decimal places are analyzed until a resolution of 0.1% is reached.

Example: Evaluation of decimal places

EPS/MP with 600 V, 25 A 600 V * 0.1 % = 0.6 V  one decimal place 25 A * 0.1 % = 0.025 A  three decimal places

Optional, after a numerical value, a letter may be added to indicate the unit. However, this letter will not be analyzed.

Example: Attached letter as unit

UA,10.0 V  Resets output voltage to 10 V UA,10.0 m  Caution! The ‚m‘ will not be evaluated, output voltage here is also 10 V

Example: A valid command with corresponding hex values

U A , 1 0 . 2 <CR> 55 h 41 h 2 ch 31 h 30 h 2 eh 32 h 0 dh

Example: Adjustment of output voltage 10 V/5 A (full command sequence)

OVP,100  adjusts OVP to 100 V UA,10  adjusts output voltage to 10 V IA,5  current limiting 5 A SB,R  output enabled

Page 19

Universal interface (Option)

Instruction Set

The IEEE-488.2 standard demands several basic commands. Some commands may occur twice for compatibility reasons (once in the EPS version and once in the (old) IEEE-488.2 version). The following syntax is used to describe the commands:

[] Square brackets  optional parameter

<> Angle bracket  numerical value

{} Curly bracket  selection list

| Vertical line  separator within selection list

Example

GTR[,{0|1|2}] means that the command GTR can be used with or without parameters. If a parameter exists, it has to be 1, 2 or 3. Valid commands are: GTR GTR,1 GTR,2 GTR,3 IA[,<imax>] means that the command IA can be used either with or without parameters. If a parameter exists, it has to be a numerical value.

Quick view of commands

Command Description Result

CLS* or CLS

Clear Status

Deletes the status byte

DAT,,

DIP Data for user

defined characteristic

DCL Device Clear

Initialization data reset

GTL Go To Local

Activates front panel operation

GTR[,{0|1|2}]

Go To Remote

Activates digital interface

operation

IA[,<imax>]

Set I

max

Adjusts current limiting

ID or *IDN?

Identification

Displays identification string

IMPP[,<impp>]

Set I

mpp

Adjusts MPP current during PVsim mode.

LLO Local Lockout

Deactivates LOCAL button

LIMI Limit I

Reads maximum

adjustable current limitation

LIMP Limit P

Reads maximum unit output.

LIMR Limit R

Reads adjustable range for R

within UIR mode.

LIMRMAX

Limit R

max

Reads maximum adjustable range for R

within UIR mode.

LIMRMIN

Limit R

min

Reads minimum adjustable

range for R

within UIR mode.

LIMU Limit U

Reads maximum adjustable voltage limitation

MODE[,{UI|UIP|UIR|PVSIM|

USER|Skript}]

Set Mode Selects operation mode

MU[,<Nr>]

Measure U

Measures present output voltage

MI[,<Nr>]

Measure I

Measures present

output current

*OPT? Optional Identification Query

Displays units current hardware/software version

OVP[,<U

ovp

>] Overvoltage Protection

Adjusts over voltage protection

PA[,<P

limit

>] Set P

max

Adjusts power limitation

PCx[,<baud>,<parity>,

<data bits>,<stop bits>, <handshake>,<echo>, <timeout>]

Program Communication

Adjusts the interfaces

RA[,<R

>] Set Ri

Adjusts internal resistance

REGLER[,<Nr>,<Kp>,<Ki>,

<Kd>]

Controller Parameters Adjusts controller parameters for UIP, UIR and PVsim mode

RI or

*RST Reset Instrument

Resets hardware (no return value)

SB[,{S|R|1|0}]

Standby

Enables/blocks the output

SCR[,<CMD>[,<value>]]

Load Script

Programming of script memory

SS or *PDU Save Setup

Saves previously made channel and interface parameter

adjustments (no return

value)

STATUS Status

Query of the units status (return values in binary format) (also see following

table)

STB or *STB?

Interface Status

UA[,<ua>] Set Ua

Adjusts output voltage (if there are no parameters, present set point is

displayed)

UMPP[,<umpp>] Set U

mpp

Adjusts MPP voltage in PV

sim

mode (if there are no parameters, present set point

is displayed)

WAVE End Userwave Data

Ends transfer of user

defined output characteristic (gradual interpolation of

intermediate values)

WAVELIN End Userwave Data

Ends transfer of user

defined output characteristic (linear interpolation of

intermediate values)

WAVERESET,<Um>,<Im>

Start Userwave Data

Starts transfer of user

defined output characteristic

Page 20

Universal interface (Option)

Detailed description of commands

CLS* or CLS - Clear Status

This command deletes the status byte. It affects only the status byte of the interface, the command was sent from. No return value. For detailed description of the status byte see the different interface chapters.

DAT,, - Data

Data for a user-defined characteristic. No return value. For detailed description of this command see  Wavereset.

DCL - Device Clear

This command resets the initialization data. No return value. Caution: Interface parameters are also reset!

GTL - Go To Local

This command activates front panel operation. If ‚Local Lockout‘ (LLO) was activated before, it will also be reset. No return value.

GTR[,{0|1|2}] - Go To Remote

This command activates digital interface operation. The optional parameter affects the future behavior of the unit after switch on. Setting is saved permanently. No return value.

Optional parameter 0 = Deactivates automatic remote operation

The command GTR must be entered to activate the unit’s remote operation mode. This mode is useful if the unit shall be operated manually and at the same time, measurement values shall be read out via the digital interface.

Optional parameter 1 = Activates remote operation on first addressing

Unit switches to remote operation when receiving a command via digital interface. The only exception is the GTL command, which switches the unit to local mode.

Optional parameter 2 = Activates remote operation immediately after switch on

After the unit was switched on, remote mode is immediately activated. Front panel operation is deactivated.

IA[,<imax>] - Set I

max

This command adjusts current limiting. Entering the command without parameters displays the set value. If the set value is higher than the maximum current of the unit, the range-error-bit within the ESR register of the interface is set. The present set value remains unchanged. If the set value is higher than the I

limit

value, which was adjusted by the

user’s settings, but lower than the maximum current of the unit, the current is limited to the I

limit

value. No error

message.

Example: 300 A unit, I

limit

adjusted to 200 A via configuration menu

GTR Remote operation OVP,200 Over voltage protection 200 V UA,10 Output voltage 10 V IA,100 Output current 100 A SB,R Output open IA,400 Output current 400 A, this command is ignored, because the current is higher than the maximum current of the device.

„Rangeerror“ is set within the status byte.

IA,250 Output current 250 A, since the output current was limited to 200 A via configuration menu, current limiting is set to 200

A. Error bit is not set. IA Query of the adjusted current. IA,200.0A Unit answers: I

limit

= 200 A

In master/slave mode, the current of a programmed device is adjusted. Connected in parallel, the total current is n x IA.

Example:

In M/S mode, 3 devices are connected parallel. IA,10 programs an output current of 10 A. All connected devices are set to 10 A. Since 3 devices have been connected parallel, the total current is 3 x 10A = 30A.

ID or IDN? - Identification

This command displays the identification string. Return value: <ID-String>.

Page 21

Universal interface (Option)

IMPP[,<impp>] - Set I

mpp

This command adjusts the MPP current for PV

sim

mode. Entering the command without parameters displays the set value. If the set value is higher than the maximum current of the unit, the range-error-bit within the ESR register of the interface is set. The present set value remains unchanged. If the set value is higher than the I

limit

value, which was

adjusted by the user’s settings, but lower than the maximum current of the unit, the current is limited to the I

limit

value. No error message follows.

Example:

GTR Remote operation OVP,200 Over voltage protection UA,50.5 Open circuit voltage of a 50.5 V simulated PV generator IA,10 Short circuit current of a simulated 10 A PV generator UMPP,40.4 MPP voltage of a simulated 40.4 V PV generator IMPP,8.2 MPP current of a simulated 8.2 A PV generator MODE,PVSIM Activates PV simulation mode SB,R Output open

In master/slave mode, the current of a programmed device is adjusted. In parallel connection the total current is n x IA.

LIMI - Limit I

With this command the user can read the maximum adjustable current limiting.

Example: 300A unit, I

limit

was adjusted to 200 A via configuration menu

LIMI Query of maximum adjustable current LIMI,200.0A Unit answers: I

limit

= 200 A

LIMP - Limit Pa

With this command the user can read the unit’s maximum output.

Example: 10 kW unit

LIMP Query of units output LIMP,10000 Unit answers: 10 kW

LIMR - Limit R

With this command the user can read the adjustable range for Ri within UIR mode.

Example:

LIMR Query of adjustable internal resistance LIMR,0.015R,1.00R Unit answers: 15 mOhm up to 1 Ohm

LIMRMAX - Limit R

max

With this command the user can read the maximum adjustable range for Ri within UIR mode.

Example:

LIMRMAX Query of maximum adjustable internal resistance LIMRMAX,1.000R Unit answers: 1 Ohm

LIMRMIN - Limit R

min

With this command the user can read the minimum adjustable range for Ri within UIR mode.

Example:

LIMRMIN Query of minimum adjustable internal resistance LIMRMIN,0.015R Unit answers: 15 mOhm

Page 22

Universal interface (Option)

LIMU - Limit Ua

Reads maximum adjustable voltage limitation. This command requests the previously defined maximum output voltage.

Example: 300 V unit was adjusted to 200 V via configuration menu

LIMU Query of maximum adjustable current LIMU,200.0V Unit answers: U

limit

= 200 V

LLO - Local Lockout

This command deactivates the

Local

button. Unit cannot be switched to local mode by holding the button

Standby

No return value.

MI[,<Nr>] - Measure I

This command measures the present output current.

Example:

GTR Remote operation OVP,200 Over voltage protection 200 V UA,10 Output voltage 10 V IA,1 Output current 1 A SB,R Output open MI Measures present output current MI,0.567A Unit answers: 567 mA

In master/slave mode with parallel connection the total current of all connected devices is displayed. Using the parameter <Nr> will show the value of each connected device. Numbering starts with 0.

Example:

MI,2 displays the measured output current at the bus of device number 3.

MODE[,{UI|UIP|UIR|PVSIM|USER|Skript|0|1|2|3|4|5}] - Set Mode

This command selects the operation mode. Entering the command without parameter displays the presently selected operation mode. Entering the command with parameter activates the operation mode. Alternatively, the operation mode can be indicated as number.

The following table shows the different settings:

Command Function

MODE,UI

MODE,0

UI mode is activated

MODE,UIP

MODE,1

UIP mode is activated

MODE,UIR

MODE,2

UIR mode is activated

MODE,PVSIM

MODE,3

sim

mode is activated

MODE,USER MODE,4

User-defined UI characteristic is activated. The characteristic is defined with the

commands

DAT, WAVE, WAVELIN

and

WAVERESET

MODE,SKRIPT

MODE,5

Script mode is activated. The script is read from the memory card or loaded after

the command SCR has been entered.

Page 23

Universal interface (Option)

MU[,<Nr>] - Measure U

This command shows the measurement value of the present output voltage.

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V UA,10 Output voltage 10 V IA,1 Output current 1 A SB,R Output open MU Measures present output voltage MU,10.0V Unit answers: 10 V

In master/slave mode with serial connection the total current of all connected devices is displayed. Using the parameter <Nr> will show the value of each connected device. Numbering starts with 0.

Example:

MU,1 displays the measured output voltage at the bus of device number 2.

*OPT? - Optional Identification Query

This command does an optional identification query, which means it displays the software version.

Example:

*OPT? Query of version number

08.06.2012 V42 Unit answers: Version 42 vom 08.06.2012

OVP[,<U

ovp

>] - Over Voltage Protection

This command adjusts the over voltage protection. Entering the command without parameter displays the present set point. If the set point is higher than a maximum of 1.2 x voltage of the unit, the range error bit within the ESR register of the interface is set. The present set point remains unchanged.

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V UA,100 Output voltage 100 V IA,10 Output current 10 A SB,R Output open

PA[,<P

limit

>] - Set P

limit

This command adjusts the power limitation for UIP mode. Entering the command without parameter displays the present set point. If the set point is higher than the maximum power of the unit, the range error bit within the ESR register of the interface is set. The present set point remains unchanged.

Example:

GTR Remote operation mode MODE,UIP UIP mode activated OVP,200 Over voltage protection 200 V UA,100 Output voltage 100 V IA,10 Output current 10 A PA,500 Power limitation 500 W SB,R Output open

In master/slave mode the power of a programmed device is adjusted. Total output is n x PA.

Example:

2 devices are in M/S mode. The command PA,100 sets the power output to 100 W. Both connected device are adjusted to 100 W. The total output is 2 x 100 W = 200 W.

Page 24

Universal interface (Option)

PCx[,<baud>,<parity>,<data bits>,<stop bits>,<handshake>,<echo>,<timeout>] - Program Communication

This command adjusts the interfaces. The EPS/MP has a maximum of 3 digital interfaces (x = 1, 2 or 3). The corresponding commands are

PC1, PC2

PC3

. Type and number of parameters depend on the type of interface. Currently there are no settings available for GPIB and LAN. Entering the command without parameter displays present interface parameters.

Parameter Function

<baud>

Baud rate in bps

Data parity

O = Odd = Uneven parity E = Even = Even parity N = None = No parity bit

<data

bits> Number of data bits

Number of stop bits

Handshake

H = Hardware S = Software N = None (no handshake)

<echo>

Character echo

E = Echo = echo on N = None = echo off

Timeout in ms when switching between sending and

receiving (RS485 only)

Allowed parameters for RS232 interface: PCx,<baud>,<parity>,<data bits>,<stop bits>,<handshake>,<echo>

Parameter Function

Baud: 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 62500, 115200

Parity: O, E, N

Data bits:

7, 8

Stop bits

1, 2

Handshake:

H, S, N

Echo: E, N

Allowed parameters for USB interface: PCx,<baud>,<parity>,<data bits>,<stop bits>,<handshake>,<echo>

Parameter Function

Baud: 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 62500, 115200

Parity: O,

E, N

Data bits:

7, 8

Stop bits

1, 2

Handshake:

H, S, N

Echo: E, N

Note: The USB interface of the PC is controlled like a virtual COM port and therefore the parameters correspond to those of the RS232 interface.

Allowed parameters for RS485 interface: PCx,<baud>,<parity>,<data bits>,<stop bits>,<timeout>

Parameter Function

Baud: 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 62500, 115200

Parity: O, E, N

Data bits:

7, 8

Stop bits

1, 2

Timeout:

0…100

If the interface parameters must be changed permanently, the data has to be saved after the

PCx

command with the

command

<SS>

. No return value.

Page 25

Universal interface (Option)

Example:

PC1 Query of first interface parameters PC1,RS232,9600,N,8,2,N,E Unit answers: PC1 is a RS232 interface, 9600 bauds, 8 data bits, 2 stop bits, no handshake, no

parity, echo on.

PC1,115200,N,8,2,N,E Adjust baud rate to 115200 baud.

The new baud rate is active immediately after the command has been sent! PC2 Query of second interface parameters PC2,RS485,9600,N,8,1,1 Unit answers: PC2 is a RS485 interface, 9600 bauds, 8 data bits, 1 stop bit.

Timeout when switching between receiving and sending is 1 ms. PC2,9600,N,8,1,50 Increase timeout to 50ms. PC3 Query of third interface parameters PC3, EMPTY Unit answers: Interface 3 is not available in this unit. SS Save settings.

RA[,<Ri>] - Set Ri

This command adjusts the internal resistance for UIR mode. Entering the command without parameters displays the present set point. If the set point is out of adjustment range the range error bit of the interface is set in the ESR register. The present set point remains unchanged. Adjustment range can be requested with the commands

LIMRMAX

and

LIMRMIN

Example:

GTR Remote operation mode MODE,UIR UIR mode activated OVP,200 Over voltage protection 200 V UA,100 Output voltage 100 V IA,10 Output current 10 A RA,0.1 Internal resistance 0,1 Ohm SB,R Output open

REGLER[,<Nr>,<Kp>,<Ki>,<Kd>] – Controller Parameter

Settings for controller parameters in UIP, UIR and PV

sim

mode. Entering the command without parameters displays the

present settings as a table. The number of the parameter determines the parameter set which is to be adjusted.

0 Controller for UIP 1 Controller for UIR 2 Controller for PV

sim

The range of values for controller parameters is 0 - 30000. New settings can permanently be saved with the command

. For a detailed description of the controller parameters see Controller.

Example:

REGLER Read present settings Type P I D P 10 20 5 Ri 20 20 2 Pv 10 5 5

Unit answers: UIP Mode Kp = 20 Ki = 10 Kd = 5 UIR Mode Kp = 20 Ki = 20 Kd = 5

PV Mode Kp = 10 Ki = 5 Kd = 5 REGLER,0,10,10,5 New controller parameters for UIP mode REGLER,1,22,18,5 New controller parameters for UIR mode SS Save new settings

RI or *RST - Reset Instrument

The unit executes a hardware reset. No return value.

Page 26

Universal interface (Option)

SB[,{S|R|1|0}] - Standby

This command enables/disables the output. Entering the command without parameters displays the present standby status. The commands

SB,S

and

SB,1

switch the unit to standby mode, the output is disabled. The commands

SB,R

and

SB,0

disable the standby mode, the output is enabled.

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V UA,100 Output voltage 100 V IA,10 Output current 10 A SB,R Output is active SB Retrieve standby status SB,R Unit answers: output is active

SCR[,<CMD>[,<value>]] - Load Script

With this command the script memory can be programmed. The command

SCR

without parameters initializes the

programming procedure. The command

SCR

with parameters writes the commands into the script memory. The

order of the commands corresponds to the order of commands of the script. Script commands and their parameters are described in the chapter  Script Control.

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V SCR Initialisation of script programming SCR,U,12 1. script command: U = 12 V SCR,I,15 2. script command: I = 15 A SCR,UI 3. script command: mode UI SCR,RUN 4. script command: activate output SCR,LOOPCNT,10 5. start address loop SCR,U,12 6. script command: U = 12 V SCR,DELAY,8 7. script command: wait 8 ms SCR,U,1 8. script command: U = 1 V SCR,DELAY,1000 9. script command: wait 1 s MODE,SKRIPT Activate script mode SB,R Start script

SS or *PDU - Save Setup

Saves present unit parameters (interface parameter and controller parameter). No return value.

STATUS - Status

Query of device status. Return value in binary units. Function of the bits within the status byte:

Bit Function

D15

Number of units in M/S mode. If no other device is connected, 1 is displayed, if two devices are connected to the bus, 2 is displayed etc. If M/S mode was disabled via configuration menu, 0 is displayed.

D14

D13

D12

D11 - reserved

D10 - reserved

D9 - reserved

D8 Limit mode, unit in power limitation mode

D7 Limit mode, unit in current limitation mode

D6 Local lockout (1 = LLO active, 0 = LLO not active)

D5 Local (1 = front panel

operation)

D4 Remote (1 = digital interface operation)

D3 - reserved

D2 - reserved

D1 Standby (1 = unit in standby mode)

D0 OVP (1 = shut down by over voltage protection)

Page 27

Universal interface (Option)

Example:

STATUS Status query STATUS,0000000100010000 Unit answers: Remote operation mode, power limitation

UA[,<U

max

>] - Set U

max

This command adjusts the voltage limitation. Entering the command without parameters displays the present set point. If the set point exceeds the maximum voltage of the unit, the range error bit within the ESR register of the interface is set. The present set point remains unchanged. If the set point is higher than the selected value for U

limit

but lower than the unit’s maximum voltage, voltage limitation is restricted to U

limit

. There is no error message.

Example:

GTR Remote control operation OVP,320 Over voltage protection 320 V UA,100 Output voltage 100 V IA,10 Output current 10 A SB,R Output is active UA,400 Output voltage 400 V. This command is ignored because the voltage is higher than the maximum voltage of the unit.

Range error is set within the status byte.

UA,250 Output voltage 250 V. Since the output voltage was limited to 200 V via configuration menu, voltage limitation is adjusted

to 200 V. An error bit is not set. UA Query of adjusted voltage UA,200.0V Unit answers: set point Ua = 200 V

In master/slave mode the voltage of the programmed device is set. In master/slave serial connection the total voltage is n x UA.

Example:

3 devices are connected in series while in M/S mode. With UA,10 an output voltage of 10V is programmed. Therefore all connected devices are adjusted to 10V. Since three devices are connected in series, the total voltage is 3 x 10 V = 30 V.

UMPP[,<Umpp>] - Set U

mpp

This command adjusts the MPP voltage for PV

sim

mode. Entering the command without parameters displays the present set point. If the set point is higher than the maximum voltage of the unit, the range error bit within the ESR register of the interface is set. The present set point remains unchanged. If the set point is higher than the U

limit

value which was adjusted in the configuration menu, but lower than the maximum voltage of the unit, the voltage limitation is restricted to U

limit

. There is no error message.

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V UA,50.5 Open circuit voltage of a simulated PV generator 50.5 V IA,10 Short-circuit current of a simulated PV generator 10 A UMPP,40.4 MPP voltage of a simulated PV generator 40.4 V IMPP,8.2 MPP current of a simulated PV generator 8.2 A MODE,PVSIM Activate PV

sim

mode

SB,R Output active

In master/slave mode the MPP voltage of the programmed device is adjusted. When connected in series, the MPP total voltage is n x UMPP.

WAVE - End Userwave Data

This command ends the transfer of a user defined output characteristic. Interpolation of interim values is layered. For detailed information about the function of this command see  Wavereset.

WAVELIN - End Userwave Data

This command ends the transfer of a user defined output characteristic. Interpolation of interim values is linear. For detailed information about the function of this command see  Wavereset.

Page 28

Universal interface (Option)

WAVERESET,<U

max

><I

max

> - Start Userwave Data

Starts the transfer of a user defined output characteristic. The parameters U

max

and I

max

define the maximum voltage

of the output characteristic. Afterwards, the fulcrums of the UI characteristic can be entered using the command

DAT

. The characteristic ends with the commands

WAVE

WAVELIN

Example:

GTR Remote operation mode OVP,200 Over voltage protection 200 V WAVERESET,100,10 Output characteristic with a maximum of 100 V and 10 A DAT,90,1 Fulcrum 90 V, 1 A DAT,50,5 Fulcrum 50 V, 5 A DAT,10,9 Fulcrum 10 V, 9 A WAVELIN End of characteristic, linear interpolation MODE,USER Activates the created UI characteristic SB,R Output active

For more information and examples of user defined characteristics see  Wave, Wavelin and Programming of characteristics (Script Operation).

Response String

The response string has the following format:

command comma value unit <CR> <LF>

The value is a floating point string with a ‘.‘ as delimiter.

Command Response Command Response

IA IA,12.34A

MU MU,10.0V

LIMU LIMU,500.0V

PA PA,12W

LIMI LIMI,30.00A

RA RA,0.015R

LIMP LIMP,15000W

UA UA,100.0V

LIMRMIN

LIMRMIN,0.015R

UMPP UMPP,90.2V

LIMRMAX

LIMRMAX,0.110R

IMPP IMPP,10.01A

LIMR LIMR,0.015R,0.110R

OVP OVP,600.0V

Example: Command as ASCII and HEX protocol

L I M U , 5 0 0 . 0 V 4C 49 4D 55 2C 35 30 30 2E 30 56 0D 0A

The digits after the decimal point correspond to the resolution of the unit.

Example

UA at a 600 V unit UA,123.4V UA at a 50 V unit UA,23.44V

The digits before the decimal point depend on the present measurement value.

Example: 600 V unit

UA,10.4V UA,220.3V UA,1.1V

Example: 50 V unit

UA,1.23V UA,10.47V UA,0.01V

Page 29

Ext. Control: Computer

EXT. CONTROL: COMPUTER

GPIB

Connection is carried out with a 24pin Centronics connector. The device address is adjusted with the DIP switches S1S5. Here, S1 has the lowest priority and S5 the highest.

No Name Function

1 DIO1 Data line 1

2 DIO2 Data line 2

3 DIO3 Data line 3

4 DIO4 Data line 4

5 EOI End or Identify

6 DAV Data Valid

7 NRFD Not Ready For Data

8 NDAC No Data Accepted

9 IFC Interface Clear

10 SRQ Service Request

11 ATN Attention

12 SHIELD

Shield

13 DIO5 Data line 5

14 DIO6 Data line 6

15 DIO7 Data line 7

16 REN Remote Enable

18 - 23

GND Ground

24 SGND Signal Ground

Table: Device address

S1 S2 S3 S4 S5 Address S1 S2 S3 S4 S5 Address

Off Off Off Off Off 0

Off Off Off Off On 16

On Off Off Off Off 1 On

Off Off Off On 17

Off On Off Off Off 2

Off On Off Off On 18

On On Off Off Off 3 On On

Off Off On 19

Off Off On Off Off 4

Off Off On Off On 20

On Off On Off Off 5 On

Off On Off On 21

Off On On Off Off 6

Off On On Off On 22

On On On Off Off 7 On On On

Off On 23

Off Off Off On Off 8

Off Off Off On On 24

On Off Off On Off 9 On

Off Off On On 25

Off On Off On Off 10

Off On Off On On 26

On On Off On Off 11 On On

Off On On 27

Off Off On On Off 12

Off Off On On On 28

On Off On On Off 13 On

Off On On On 29

Off On On On Off 14

Off On On On On 30

On On On On Off 15 On On On On On 31

The device address is read in only when the unit is switched on. Changing the DIP switches while the unit is active will not change the device address!

Table: Device equipment (according to IEEE-488.1)

Page 30

Ext. Control: Computer

SH1

Source Handshake function available

AH1

Acceptor Handshake function available

Talker, Serial Poll, end addressing by MLA

Listener function, end addressing by MTA

SR1

Service request available

RL1

Remote/Local function available

PP0

No parallel poll function

DC1

Device clear function available

DT0

No trigger function

no controller function

Open-collector driver

Status Word

The status word can be read with the command

<STB>

<*STB?>

. Return value: STB,xxxxxxxx

Table: Reading the status word

Bit Function

D7 n/a

D6 SRQ is set, if SRQ was requested

D5 ESB is set, if a byte was set within the SES

D4 MAV is set, if a message is available

D3 n/a

D2 see table

D1 see table

D0 see table

Table: Error messages

D3 D2 D1 D0 Error

0 0 0 1 Syntax

0 0 1 0 Command

0 0 1 1 Range

0 1 0 0 Unit

0 1 0 1 Hardware

0 1 1 0 Read

ESR-Register - Event-Status-Register

The ESR register can be read using the command

<*ESR?>

. Return value: ESR,xxxxxxxx. After the query, the ESR

Bit Function

D7 Power on

D6 Command error

D5 User request

D4 Execution error

D3 Device dependent

error

D2 Query error

D1 Request control

D0 Operation complete

RS232

INTERFACE

The connection of the RS232 interface is carried out with a 9pin sub D connector.

Page 31

Ext. Control: Computer

No Name Function

1 N.C.

2 TxD Data line from unit to PC

3 RxD Data line from

PC to unit

4 N.C.

5 GND GND

6 N.C.

7 CTS

Reception of the PC, signal direction from PC to unit

(only required for active Hardware handshake)

8 RTS

Reception of the unit, signal direction from unit to PC

(only required for active Hardware handshake)

9 N.C.

The interface can be operated using the following parameters: Baud rate: 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 62500, 115200 Parity: O = Odd = uneven parity

E = Even = even parity

N = None = no parity bit Number of data bits: 7 or 8 Number of stop bits: 1 or 2 Handshake: H = Hardware

S = Software

N = None (no handshake)

The defined character for XON is 0 x 11 and for XOFF it is 0 x 13.

Interface parameters in delivery state are 9600 baud, no parity, 8 data bits, 1 stop bit, echo on. The status word can be read with the command

<STB>

<*STB?>

. The following functions are assigned to the bits:

Bit Function

D15 Parity error

D14 Over

run error

D13 Framing error

D12 Timeout error

D11 Echo on

D10 used internally, can be 1 or 0

D9 Hardware handshake (RTS/CTS)

D8 Software handshake (XON/XOFF)

D7 Parity enable

D6 Parity mode (1 = odd, 0 = even)

D5 Stop bit (1 = 2 stop bits; 0 = 1

stop bit)

D4 Data format (1 = 8 bit; 0 = 7 bit)

D3 used internally, can be 1 or 0



Table



Table



Table

Table: Error messages

D2 D1 D0 Error

0 0 1 Syntax

Page 32

Ext. Control: Computer

0 1 0 Command

0 1 1 Range

1 0 0 Unit

1 0 1 Hardware

1 1 0 Read

If echo is on, the interface confirms each incoming character by sending the same character back to the sender. The interface parameters can be adjusted via software and the command

<PCx>

. These settings can be saved with the

command

<SS>

Interface Reconfiguration

In case, the user has forgotten the active setup, there are two ways of reconfiguring the interface:

• sending the command

<PCx>

from one of the other interfaces

• using the display to configure the interface  Interface Parameters

RS485 I

NTERFACE

The interface works with the following parameters:

Baud rate: 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 62500, 115200 Parity: O = Odd = uneven parity

E = Even = even parity

N = None = no parity bit Number of data bits: 7 or 8 Number of stop bits: 1 or 2 Timeout: 0-100 ms

A timeout is the time between receipt and sending of a message. The connected device is selected by entering the command and placing the number of the device and ‘#’ before it. When using the word ‚ALL‘ instead of a number, the following command will be executed by all connected devices (e. g. #1,ID; #22,GTR, #ALL,GTL).

Example:

#1,ID #22,GTR #ALL,GTL

The status word can be read with the command

<STB>

<*STB?>

. The following functions are assigned to the bits:

Bit Function

D15 Parity error

D14 Over run error

D13 Framing error

D12 Timeout error

D11 n/a

D10 n/a

D9 n/a

D8 n/a

D7 Parity enable

D6 Parity mode (1 = odd, 0 = even)

D5 Stop bit (1 = 2 Stop bits; 0 = 1 Stop bit)

D4 Data format (1 = 8 bit; 0 = 7

bit)

D3 n/a



Table



Table



Table

Table: Error messages

D2 D1 D0 Error

0 0 1 Syntax

Page 33

Ext. Control: AI Interface (Option)

0 1 0 Command

0 1 1 Range

1 0 0 Unit

1 0 1 Hardware

1 1 0 Read

Interface parameters are configured via software using the command

<PCx>

. The settings can be saved with the

command

<SS>

Interface Reconfiguration

In case, the user has forgotten the active setup, there are two ways of reconfiguring the interface:

• sending the command

<PCx>

from one of the other interfaces

• using the display to configure the interface  Interface Parameters

EXT. CONTROL: AI INTERFACE (OPTION)

The device can be controlled via control signals and by using the analog/digital In/Out.

Page 34

Ext. Control: AI Interface (Option)

IN ASSIGNMENT AI INTERFACE

No (BD25) Dir Name Function

1 analog out

mon

Monitor set point U

2 analog out

mon

Monitor set point I

3 analog out

mon

Monitor actual value P

4 analog out

OVP

mon

Monitor actual value OVP

5 digital in

Soft-Interlock

Interlock function (Caution: Interlock does not

correspond to the machinery directives)

6 -nc- - -

7 digital out

Signals „Const. Voltage“ mode

8 analog out

istmon

Monitor output voltage

9 gnd GND -

10 digital out

Standby

Signals standby

11 gnd GND -

12 -nc- - -

13 REF10 10 V-V

ref

Output 10

V reference voltage

14 analog in

set

Set point U

15 analog in

set

Set point I

16 analog in

In 2 -

17 analog in

OVP

set

Set point OVP

18 analog in

In 4 -

19 digital in

Ext. Control

Activates analog control

20 digital in

Standby

Activates standby

21 analog out

istmon

Monitor output current

22 pwr + 5 V Output 5 V supply voltage

23 gnd GND -

24 digital out

Error Signals shut down by OVP

25 gnd GND -

26 -nc- - -

All digital outputs are OC outputs with a pull-up resistance after + 5 V. All analog inputs and outputs can be operated in 0-5 V or in 0-10 V mode.

NALOG INPUT

Set points are adjusted as dc voltage (0-5 V or 0-10 V) on the analog inputs. The voltage range can be chosen in the configuration menu.

Set Point U (U

Set

)

Set point output voltage. The set point refers to the rated voltage of the unit.

Page 35

Ext. Control: AI Interface (Option)

Example:

EPS/MP at 600 V output voltage, AI is adjusted to 10 V, desired output voltage = 100 V. U

set

= 10 V * 100 V ÷ 600 V = 1,667 V

Set Point I (I

Set

)

Set point output current. The set point refers to the rated voltage of the unit.

Example:

EPS/MP at 100 A output voltage, AI is adjusted to 10 V, desired output current = 2 A. I

set

= 10 V * 2 A ÷ 100 A = 0.200 V

Set Point OVP (U

OVP

)

The output is deactivated immediately if the output voltage exceeds the adjusted value. This error is indicated on the display with the word „Error“. To rest this error, standby mode must be activated. Adjustment range is 0 V up to the maximum rated voltage of the device + 20%.

Example:

EPS/MP with 600 V output voltage, AI is adjusted to 10 V, desired OVP voltage = 650 V. Adjustment range: 600 V + 20% = 720 V U

set

= 10 V * 650 V ÷ 720 V = 9.028 V

NALOG OUTPUT

On the analog outputs, present measurement values are displayed as dc voltage values (regardless of the actual operation mode). Therefore the AI interface can be used for monitor purposes. Maximum voltage is 5 V / 10 V.

Monitor Set Point U (U

mon

)

Present set point of the output voltage. Measurement value refers to the rated voltage of the device.

Example:

EPS/MP at 600 V output voltage, AI is adjusted to 10 V, voltage at output U

mon

= 2 V.

Present set point: U

set

= 2 V * 600 V ÷ 10 V = 120 V

Monitor Set Point I (I

mon

)

Present set point of the output current. Measurement value refers to the rated current of the device.

Example:

EPS/MP at 100 A output current, AI adjusted to 10 V, voltage at output I

mon

= 2 V.

Present set point: I

set

= 2 V * 100 V ÷ 10 V = 20 A

Monitor Actual Value P (P

mon

)

Present set point for output power. It is calculated by the controller from measurement values of output voltage and output current. Measure value refers to the rated power of the device.

Example:

EPS/MP at 15 kW rated power, AI adjusted to 10 V, voltage at output P

mon

= 5 V.

Present output power P

out

= 5 V * 15 kW ÷ 10 V = 7.5 kW

Page 36

Ext. Control: AI Interface (Option)

Analog Output OVP (U

OVPmon

)

Present set point for over voltage protection. Measurement value refers to the rated voltage of the device + 20%.

Example:

EPS/MP at 600 V output voltage, AI adjusted to 10 V, voltage at output U

mon

= 2 V. Signal refers to 600 V + 20% = 720 V.

Present set point: U

ovp

= 2 V * 720 V ÷ 10 V = 144 V

Monitor Output Voltage (U

Istmon

)

Present measure value point value for output voltage. Measurement value refers to the rated voltage of the device.

Example:

EPS/MP at 600 V output voltage, AI adjusted to 10 V, voltage at output U

istmon

= 6 V.

Present output voltage U

out

= 6 V * 600 V ÷ 10 V = 360 V

Monitor Output Current (I

Istmon

)

Present measure value for output current. Measurement value refers to the rated current of the device.

Example:

EPS/MP at 100 A output current, AI adjusted to 10 V, voltage at output I

istmon

= 4 V.

Present output current I

out

= 4 V * 100 A ÷ 10 V = 40 A

IGITAL INPUT

The digital inputs can be used to adjust the operation mode for the analog control. Inputs are low active.

Activation (Ext. Control)

The input ‚Ext. Control‘ can be used to chose the operation mode ‚AI‘. The AI interface is activated by an applied voltage of + 5 V up to + 10 V. Front panel operation is deactivated. Operation mode is marked as ‚AI‘ on the display. The digital interface takes priority over the AI interface. The settings from AI interface have no effect if the device is toggled to ‚Remote‘.

Soft-Interlock

The Interlock deactivates the unit immediately, when the connection between interlock input (Pin 5) and +5 V voltage is opened. In this case, the output of the unit cannot be activated, neither by interface nor by front panel. The difference between Soft-Interlock and Interlock is that a Soft-Interlock does not correspond to the machinery directives. If the Soft-Interlock is triggered, the unit switches into Interlock-Mode.

Blocking (Standby)

The standby mode is activated by an applied voltage of + 5 V up to + 10 V. The output signal is enabled, if the input ‚Standby‘ is toggled inactive.

IGITAL OUTPUT

On the digital outputs, actual device adjustments are displayed (irrespective of the actual operation mode). Therefore the AI interface may be used for monitoring functions also. Gauges are consistent with a negative logic: S = Set = log. 0; R = Reset = log. 1

A set output has a voltage level of < 0.6 V. A reset output has a voltage level of > 1.2 V.

Blocking (Standby)

The blocking of the output is set, if the unit is in standby mode.

Page 37

Ext. Control: Ethernet (LAN)

ONST. VOLTAGE MODE

(CV)

Constant voltage mode is set, when the unit is in constant voltage mode.

RROR

An error is set, if the unit has been shut down by OVP. To reset this error, the standby mode must be activated.

EXT. CONTROL: ETHERNET (LAN)

To communicate with the EPS/MP via network, it is necessary to assign an IP address to the device first. In delivery status, the device automatically draws an IP from the network. In its practical operation, this behavior is unfavorable, because after each activation the device has a new IP address. Therefore, to each device an individual, permanent IP address should be assigned.

The status word can be read with the command

<STB>

<*STB?>

. Only bits from D0 up to D2 are in use. All other

bits can be 1 or 0.

Table: Error messages

D2 D1 D0 Error

0 0 1 Syntax

0 1 0 Command

0 1 1 Range

1 0 0 Unit

1 0 1 Hardware

1 1 0 Read

ANUAL ASSIGNMENT OF AN IP UNDER MICROSOFT WINDOWS

After the console has been opened, clicking on ‚Start‘ and ‚Ausführen‘ opens an input field. After this, the command

cmd

command

opens a DOS window. The following has to be entered: arp -s xxx.xxx.xxx.xxx yy-yy-yy-yy-yy-yy.

‚xxx‘ is the desired IP address, ‚yy‘ is the MAC address of the unit, which can be read from the unit’s back panel.

The entry of the IP has been added to the ARP table. The device has no new IP yet. Execute telnet with new IP on port 1: telnet xxx.xxx.xxx.xxx 1. ‚xxx‘ is the desired new IP address. Connection fails but the new IP address is thus assigned to the device. The assignment of the IP is still dynamical, which means that these settings get lost after the device has been cut off from the network. The user interface can be loaded by entering the new IP address: http://xxx.xxx.xxx.xxx. By selecting the menu item ‚Config‘, the IP address can be adjusted. Java must be supported by your browser to adjust the IP.

Page 38

Ext. Control: Ethernet (LAN)

ONITORING THE DEVICE VIA BROWSER

The user interface opens via direct request of the IP address: http://xxx.xxx.xxx.xxx. The item menu ‚Control‘ opens the control of the unit. Java must be supported by your browser to control the device.

Whe n co ntr oll ing th e dev ic e via bro ws e r, a not her con tr o l v i a tel net mu st not be ac tiv e!

ONTROLLING THE DEVICE VIA TELNET

The device can be controlled directly via port 10001. After the console has been opened, a click on ‚Start‘ and ‚Ausführen‘ opens an input field. After the commands

cmd

command

have been entered, a DOS window opens with: telnet xxx.xxx.xxx.xxx 10001. Alternatively, many terminal programs offer the possibility to establish a TCP/IP or telnet connection.

Whe n co n tr oll ing th e de vic e vi a por t 10 001 , th e use r in t er fac e of the de vic e m ust n o t b e o pen in a br o ws er!

Page 39

Ext. Control: USB

ONTROLLING THE DEVICE VIA BROWSER

The user interface can be opened via IP address: http://xxx.xxx.xxx.xxx. The menu ‚Display‘ opens the monitoring of the unit. Java must be supported by your browser to control the device. Displayed are all present measurement values, which are updated every 2 seconds. When using the monitoring function, automatic toggle to remote

operation when receiving a command should be deactivated (command

<GTR,0>

EXT. CONTROL: USB

The USB interface provides a virtual COM port for the PC. Via this port, the unit can be controlled as with a normal RS232 interface, e. g. with a terminal program. Corresponding drivers for all current operating systems are available as download: http://www.ftdichip.com/Drivers/VCP.htm.

The status word can be read with the command

<STB>

<*STB?>

Bit Function

D15 Parity error

D14 Over run error

D13 Framing error

D12 Timeout error

D11 Echo on

D10 used internally, can be 1 or 0

D9 Hardware

handshake (RTS/CTS)

D8 Software handshake (XON/XOFF)

D7 Parity enable

D6 Parity mode (1 = odd, 0 = even)

D5 Stop bit (1 = 2 Stop bits; 0 = 1 Stop bit)

D4 Data format (1 = 8 bit; 0 = 7 bit)

D3 used internally, can be 1 or 0



Table



Table



Table

Table: Error messages

D2 D1 D0 Error

0 0 1 Syntax

0 1 0 Command

0 1 1 Range

1 0 0 Unit

1 0 1 Hardware

1 1 0 Read

The defined character for XON is 0 x 11 and for XOFF it is 0 x 13.

Interface parameters are adjusted by software with the command

<PCx>

and afterwards they can be saved with the

command

<SS>

NTERFACE RECONFIGURATION

In case, the user has forgotten the active setup, there are two ways of reconfiguring the interface:

Page 40

Data Log Function (Option)

• sending the command

<PCx>

from one of the other interfaces

• using the display to configure the interface  Interface Parameters

DATA LOG FUNCTION (OPTION)

The device has a data log function. A memory card may be used as data logger. All measurement values will be saved, separated by tabulators, in a text file. The time interval may be adjusted from 1-4294967 s (= 71 minutes). To activate the data log function, a memory card must be inserted. The root directory of the memory card must contain a text file named “EPSLOG.txt“. The new data will be written into this file.

The me mor y c ard mu st be i ns ert ed or rem o ve d i n st an dby

mod e o nly !

In case, that the first entry of the first line of the file is "interval=xxxx" (xxxx = time in seconds), the memory interval is adjusted accordingly. The entry must be written in lower case letters and without space characters. If the interval remains unspecified, the memory interval is 60 seconds.

Example:

interval=30

The data log function is active whenever the device is not operating in standby mode. The function is indicated by a small memory card symbol in the upper right corner of the main display. Whenever a new data set is written, the symbol will be displayed as filled for ca. 1 second. In case the memory card is full, the symbol will be crossed out.

ORMAT OF THE SAVED DATA

The first entry shows the present operation mode. The second entry shows the present operation mode followed by ‚Udc‘ and ‚Idc‘.

Example:

USER I-Limit 1,0 10,02 USER OVP 0,0 0,00 UI U-Limit 100,01 0,10 UIP U-Limit 100,0 0,10

SCRIPT MODE

Operation sequences may be programmed in a script which can be read in from a memory card. A script is a text file, which includes a sequence of commands. Alternatively, the script memory can be programmed via digital interface

using the command

SCR

. For more information about the use of this command see  Commands. The device is able

to process up to 250 commands.

XECUTING/LOADING A SCRIPT

The script must be saved on a MMC or SD card as text file with .txt or .scr ending.

The mode ‚Scr‘ must be selected from the main display. Pushing the rotary pulse encoder will open the file selection menu. The script file can be selected. An error message appears if, the file could not be read correctly or, if the read in

Page 41

Script Mode

setup is invalid (e. g. IA 40 at a 10 A unit). To return to the file selection menu, the rotary pulse encoder or the button

Display

must be pushed again. The script has been loaded and can be started by pushing the button

Standby

The last five commands of the script are displayed in the field ‚Preset’. The actual command is placed on top. The script ends when button

Standby

is pushed and device is toggled to standby mode.

OMMANDS

Syntax

Upper and lower case are nonrelevant. Therefore, the following commands deliver the same results: PMAX 100 Pmax 100 pMaX 100. Delimiters must be placed between two commands or between command and parameter. Valid

delimiters are: blank, tabulator, LineFeed <LF>, Carriage Return <CR> and equal sign (=).

Numerical values must be placed as basic units and may not be followed by characters. Valid delimiters for decimal places are: point and comma. No characters must be attached: U 12,345 U 10.00 U 12. The command UAC 12.114V is invalid, because it is followed by a character.

All commands may be written consecutively, but must be separated by blanks: U 10 I 1 UIP LOOP RUN. Due to its unclear syntax, this style is not recommendable.

Quick view of commands

Command Description Result

; or # comment

Entering commented text.

DELAY<t>, DELAYS<t>

delay Delays execution of the script for duration of time t.

I

output current

Set point output current.

IMPP

MPP current

MPP current in ampère for PV simulation.

LOOP, LOOPCNT

Loop Define return address.

PMAX maximum output

UIP mode

Maximum output for UIP mode.

PV PVsim mode

Activate PVsim mode.

RI internal resistance UIR mode

Set point internal resistance in ohm for UIR mode.

RUN open output

Enable output.

STANDBY

close output

Disable output.

U set point output voltage

Set point output voltage in V.

UI UI mode

Activate UI mode.

UIP UIP mode

Activate UIP mode.

UIR UIR mode

Activate UIR mode.

UMPP set point MPP voltage

Set point MPP voltage (for PV simulation)

USER set points current and voltage

Generates set points

for current and voltage using the internal table.

WAIT wait Waits for user action.

WAVE, WAVELIN

characteristic programming

Characteristic programming.

Detailed description of commands

; or # - Comment

Comment on text. All characters from ; or # up to end of line will be ignored. This function is not available when programming via digital interface.

Example:

# This is a comment UIP # This command activates the UIP mode ; Comments can also start with a semicolon

DELAY, DELAYS - Time delay

The commands

DELAY

and

DELAYS

delay the execution of the script. The following number defines the duration of

the delay in ms (milliseconds). Maximum duration of delay is 65535 ms.

Example:

Page 42

Script Mode

UI # UI mode U 10 # Output voltage 10 V I 1 # Output current 1 A RUN # Activate output DELAY 200 # Wait 200 ms U 100 # Adjust output voltage to 100 V DELAYS 10 # Wait 10 seconds STANDBY # Deactivate output

I - Set point output current

This command adjusts the set point for the output current in ampere.

Example:

I 9.8 # Output current 9.8 A

IMPP - Set point MPP current

This command adjusts the set point for the MPP current for PV simulation in ampere.

Example:

IMPP 8.123 # MPP current 8.123 A

LOOP, LOOPCNT - Return Loop

Usually the script ends with the last command. A return address can be defined with the command

<LOOP>

. From

this point on, the processing will continue after the last command of the script. To interrupt the program, button

Standby

must be pushed. The command

equals the command

<LOOP>

. But here, the command

defines the number of loops. The maximum number is 65535.

Example:

# This example activates the output for 10s, then deactivates it for 2s # and starts from the beginning. This will continue until the user interrupts the # process by pushing the button Standby. UI # UI mode U 100 # Output voltage 100 V I 10 # Output current 10 A LOOP # Start address RUN # Activate output DELAYS 10 # Wait 10s STANDBY # Deactivate output DELAYS 10 # Wait 2s

# This example works like the previous one. # The cycle is executed only 10 times, and then the script ends.

Page 43

Script Mode

UI # UI mode U 100 # Output voltage 100 V I 10 # Output current 10 A LOOPCNT 10 # Start address RUN # Activate output DELAYS 10 # Wait 10s STANDBY # Deactivate output DELAYS 10 # Wait 2s

PMAX - maximum output in UIP mode

Maximum output for the UIP mode.

PV - Pv

sim

mode

Activates the PV

sim

mode.

Example:

PVSIM #Activate PV simulation

RI - Internal resistance UIR mode

This command adjusts the set point for the internal resistance in UIR mode.

RUN - Activate output

The command

RUN

resets the standby mode and activates the output.

Example:

RUN # Activate output

STANDBY - Deactivate output

The command

STANDBY

deactivates the output and activates standby mode.

Example:

STANDBY # Deactivate output

U - Set point output voltage

Set point for output voltage in V.

Example:

U 100 # Output voltage 100 V

UI - UI-Modus

This command activates the UI mode. Unit works current and voltage regulated.

Example:

UI # UI mode

UIP - UIP mode

This command activates the UIP mode. Unit works current, voltage and power regulated.

UIR - UIR mode

This command activates the UIR mode. Unit works current and voltage regulated. Additionally, an internal resistance is simulated.

UMPP - Set point UMPP voltage

Set point for MPP voltage for PV simulation in V.

Example:

UMPP 80.42 # MPP voltage 80.42 V

Page 44

Script Mode

USER - Set points current and voltage

This command generates the set points for current and voltage by using the internal table. Thereby, different UI characteristics can be created. The tables can be created beforehand by using the command

WAVE

WAIT - Waiting for user action

The program is stopped until the user pushes the button

Standby

Example:

; Starter characteristic: UI ; UI mode I 10 ; Current limitation 10 A U 12 ; Output voltage 12 V (->100%) RUN ; Activate output LOOP ; Start address after end of the script WAIT ; Waits until rotary pulse encoder is pushed U 10,5 ; 1. ramp U 9 ; Command is processed within 1 ms. Therefore the U 7,5 ; ramp has 5 interim values. U 6 U 4,5 DELAY 15 ; 15 ms pause U 4,8 ; 2. ramp U 5,1 ; Command is processed within 1 ms. Therefore U 5,4 ; the ramp has 5 interim values. U 5,7 U 6 DELAY 2000 ; 2000 ms pause U 6,6 ; 3. ramp U 7,2 ; Command is processed within 1 ms. Daher U 7,8 ; The ramp has 10 interim values. U 8,4 U 9 U 9,6 U 10,2 U 10,8 U 11,4 U 12

WAVE, WAVELIN - Characteristic programming

The command

WAVE

is used to start the characteristic programming. The command is followed by numerical values,

which indicate the desired voltage and current. Finally, followed by the command with a prefixed '-' characteristic (

WAVE

WAVE <U1> <I1> <U2> <I2> <U3> <I3> ... <Un> <In>

-WAVE

The command

WAVELIN

equals the command

WAVE

WAVELIN <U1> <I1> <U2> <I2> <U3> <I3> ... <Un> <In>

-WAVELIN

Page 45

Controller

WAVELIN

With the

WAVELIN

command, the interim values between the fulcrums are linear interpolated, with the

WAVE

command they are layered (see example). Characteristics which are not constant or negative in their course are accepted but the behavior of the unit may not be predicable.

Example:

; Characteristic with layered interim values ; This script delivers the blue characteristic in the diagram WAVE ; Start of the table 100 10 ; 100 V 10 A 50 25 ; 50 V 25 A 10 100 ; 10 V 100 A

-WAVE ; End of the table RUN ; Output active

; Characteristic with linear interim values ; This script delivers the red characteristic WAVE ; Start of the table 100 10 ; 100 V 10 A 50 25 ; 50 V 25 A 10 100 ; 10 V 100 A

-WAVELIN ; End of the table RUN ; Output active

If output voltage or output current is changed afterwards, the characteristic keeps its course. Though values are stretched or compressed to the new range.

Example:

# This script generates a blue characteristic # After a 10 second delay it switches to the green characteristic: WAVE # Start of the table 100 10 # 100 V 10 A 50 50 # 50 V 50 A 10 100 # 10 V 100 A

-WAVE # End of the table U 100 # Output Voltage 100 V I 100 # Output Current 100 A USER # Select characteristic RUN # Output open DELAY 10000 # Wait 10 seconds U 50 # Output Voltage 50 V I 50 # Output Current 50 A

CONTROLLER

The software contains three digital PID controllers. Each controller is assigned to the UIR, UIP and PVsim mode. When required, the controller parameters can be changed via universal interface.

Page 46

Controller

Imp rop er ad j us t men t o f t he co n tr o ll er c an le ad t o c ont rol ler osc ill ati ons wh ich m a y d ama ge con nec te d d evi c es !

ONTROLLER STRUCTURE PVSIM MODE AND USER MODE

The current set point is calculated from the output voltage and a table. This set point stands for the input signal of the PID controller after it was subtracted from the actual value. The PID controller releases the current set point for the power supply. The current set point is limited to the short circuit current, as a maximum. The voltage set point of the power supply is permanently set to the open circuit voltage of the table. In PVsim mode the current is regulated while the voltage is fixed.

ONTROLLER STRUCTURE

UIP M

ODE

The output voltage is multiplied with the output current. The result is subtracted from the power set point. This signal is the input signal of the PID controller, which releases the current set point for the power supply. The current set point is limited to the current set point, as a maximum. The voltage set point of the power supply is permanently set to the voltage set point. In UIP mode the current is regulated, while the voltage is fixed.

ONTROLLER STRUCTURE

UIR M

ODE

The measured output current is multiplied with the adjusted internal resistance. The result is subtracted from the adjusted set point and is then the set point for the voltage controller:

soll

= U

set

- Ia * Ri

Page 47

Controller

The output signal is limited to the voltage set point. The current set point of the power supply is permanently set to I

soll

. In UIR mode the voltage is regulated while the current is fixed.

ONTROLLER PARAMETERS

common differential equation of a PID controller:

E Controller deviation Kp Proportional coefficient Tn Reset time Tv Derivative time

Since the digital controller is a discrete-time system, the integral is replaced by a summation and the differential by a difference:

The following equation puts the controller into practice within the software:

Parameters P, I and D are calculated as follows:

Controller parameters can be programmed via digital interface using the command

REGLER

Ts Sampling time

Ts Sampling time = 300 us

( )

 



 



⋅

∫

Tv+dtte

+eKp=y

y= 0,1Pei+0,001I

∑

m=−

∞

m=i

em+0,1D(ei− e

i−1

)

P= 10Kp I=

1000

Kp

10KpTv

( )

 



 



−

−∞

∑

1ii

i=m

+eKp=y

Page 48

Sense Mode

SENSE MODE

OAD CONNECTION WITHOUT SENSOR CONDUCTOR

Almost all our power supplies are provided with sensor conductor connectors to compensate the voltage drop on the load. In case, these connectors are not in use, they must be short-circuited with correct polarity to the load outputs and directly to the output connectors. By no means, current may flow over the sense connectors. In case of multiple loads, the user has to provide a central load distribution point. To reduce peak loads and for an HF impedance terminator, a 1-10 µF capacitor should be connected to the output.

OAD CONNECTION WITH SENSOR CONDUCTOR

The following points must be considered, when existing sense cables are connected directly to the load or to the central load distribution point:

• remove existing sense cable bridges from the power supply

• directly connect + sense and - sense with correct polarity to the load distribution point

• connect + sense and - sense conductors to a 1-47 µF capacitor

• protect sense cable or at least twist + sense and - sense

• select load line cross section, so that voltage drop is < 0.4 V

• avoid overload of power supplies (voltage drop per line x current)

If thus you paid attention to the points stated above, oscillation occurs through load or power induction and complex load situations, please contact our company EPS.

OAD DISTRIBUTION WITHOUT SENSOR CONDUCTOR

To ensure a proper use, a central load distribution situation is essential. Illustration 2 shows a correct load distribution. Illustration 1 shows an insufficient supply of load 2, load 3 etc. via parallel load conductors. In practice, it may occur that an optimal distribution is not possible. Illustration 3 shows a mixed distribution, where at least the largest consumers are supplied centrally.

Page 49

Appendix

APPENDIX

QUIVALENT LEAKAGE CURRENT MEASUREMENT ACCORDING TO

VDE 0701

The equivalent leakage current measuring according to DIN VDE 0701-1 may deliver results beyond the norm. Cause: Measurements are primarily performed on so-called EMC-filters at the AC input of the units. These filters are built symmetrical, that means capacitors are installed between L1/2/3 and PE. While measuring, L1, L2 and L3 are connected together and the current flow to PE is measured. Therefore up to 3 capacitors are connected parallel which doubles or triples the measured leakage current. This is permissible according to the norm.

Quotation from the norm of 2008, appendix D:

„When measuring protection conductor currents with the equivalent leakage current measuring method, it is important to note that devices with protective grounds and symmetrical circuits may have results, due to the wiring, that are up to three or four times higher than the leakage current of one phase.“

Graphical representation of a balanced circuit:

Example illustration from the norm protective ground measuring - equivalent leakage current measuring method:

Page 50

Appendix

Note: The illustration shows the measurement method for two-phase power supplies. In the three-phase version, phase N is replaced by L2 and/or L3.

Page 51

Notes

NOTES

Page 52

Notes

Page 53

Notes