Keithley 2260B-30-72, 2260B-80-13, 2260B-30-36, 2260B-80-27 User guide

www.keithley.com

2260B Series

360W and 720W Multi-Range Programmable DC Power Supplies

User Manual

Rev. A / March 2014

A Greater Measure of Confidence

A Tektronix

Company

Series 2260B

360W and 720W Multi-Range Programmable DC Power Supplies

USER MANUAL

ISO-9001 CERTIFIED MANUFACTURER

This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent.

The information in this manual was correct at the time of printing. However, we continue to improve our products and reserve the rights to change specification, equipment, and maintenance procedures at any time without notice.

Table of Contents

SAFETY INSTRUCTIONS .................................................... 3

GETTING STARTED ........................................................... 7

2260B Series Overview ........................... 8

Appearance .......................................... 12

Theory of Operation ............................. 18

OPERATION .................................................................... 30

Set Up .................................................. 31

Basic Operation ................................... 43

Parallel / Series Operation ................... 56

Test Sequence ...................................... 71

CONFIGURATION ........................................................... 83

Configuration ....................................... 84

ANALOG CONTROL ........................................................ 98

Analog Remote Control Overview ......... 99

Remote Monitoring ............................ 115

COMMUNICATION INTERFACE ..................................... 120

Interface Configuration ...................... 121

MAINTENANCE ............................................................. 132

FAQ ............................................................................... 134

APPENDIX ..................................................................... 136

2260B Default Settings ...................... 136

Error Messages & Messages .............. 138

LED Display Format ........................... 138

2260B Series User Manual

2260B Specifications .......................... 139

2260B Dimensions ............................. 145

Declaration of Conformity .................. 147

INDEX ............................................................................ 148

SAFETY INSTRUCTIONS

WARNING

Warning: Identifies conditions or practices that could result in injury or loss of life.

CAUTION

Caution: Identifies conditions or practices that could result in damage to the instrument or to other properties.

DANGER High Voltage

Attention Refer to the Manual

Protective Conductor Terminal

Earth (ground) Terminal

SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow during operation and storage. Read the following before any operation to insure your safety and to keep the instrument in the best possible condition.

Safety Symbols

These safety symbols may appear in this manual or on the instrument.

2260B Series User Manual

Do not dispose electronic equipment as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased.

General Guideline

CAUTION

 Do not place any heavy object on the

instrument.

 Avoid severe impact or rough handling that

leads to damaging the instrument.

 Do not discharge static electricity to the

instrument.

 Use only mating connectors, not bare wires, for

the terminals.

 Do not block the cooling fan opening.  Do not disassemble the instrument unless you

are qualified.

(Measurement categories) EN 61010-1:2001 specifies the measurement categories and their requirements as follows. This instrument falls under category II.

 Measurement category IV is for measurement performed at the

source of low-voltage installation.

 Measurement category III is for measurement performed in the

building installation.

 Measurement category II is for measurement performed on the

circuits directly connected to the low voltage installation.

 Measurement category I is for measurements performed on

circuits not directly connected to Mains.

Power Supply

WARNING

 AC Input voltage range: 85VAC~265VAC  Frequency: 47Hz~63Hz  To avoid electrical shock connect the protective

grounding conductor of the AC power cord to an earth ground.

Safety Guidelines

SAFETY INSTRUCTIONS

Cleaning the Instrument

 Disconnect the power cord before cleaning.  Use a soft cloth dampened in a solution of mild

detergent and water. Do not spray any liquid.

 Do not use chemicals containing harsh material

such as benzene, toluene, xylene, and acetone.

Operation Environment

 Location: Indoor, no direct sunlight, dust free,

almost non-conductive pollution (Note below)

 Relative Humidity: 20%~ 85%  Altitude: < 2000m  Temperature: 0°C to 50°C

(Pollution Degree) EN 61010-1:2001 specifies the pollution degrees and their requirements as follows. The Instrument falls under degree 2.

Pollution refers to “addition of foreign matter, solid, liquid, or gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity”.

 Pollution degree 1: No pollution or only dry, non-conductive

pollution occurs. The pollution has no influence.

 Pollution degree 2: Normally only non-conductive pollution

occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected.

 Pollution degree 3: Conductive pollution occurs, or dry, non-

conductive pollution occurs which becomes conductive due to condensation which is expected. In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither temperature nor humidity is controlled.

Storage environment

 Location: Indoor  Temperature: -25°C to 70°C  Relative Humidity: <90%

Disposal

Do not dispose this instrument as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased. Please make sure discarded electrical waste is properly recycled to reduce environmental impact.

2260B Series User Manual

Green/ Yellow:

Earth

Blue:

Neutral

Brown:

Live (Phase)

Power cord for the United Kingdom

When using the instrument in the United Kingdom, make sure the power cord meets the following safety instructions.

NOTE: This lead/appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED IMPORTANT: The wires in this lead are coloured in accordance with the following code:

As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug/appliance, proceed as follows:

The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with either the letter E, the earth symbol

or coloured Green/Green & Yellow.

The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or contact the supplier.

This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, a cable of 0.75mm2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.

Any exposed wiring from a cable, plug or connection that is engaged in a live socket is extremely hazardous. If a cable or plug is deemed hazardous, turn off the mains power and remove the cable, any fuses and fuse assemblies. All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard.

GETTING STARTED

2260B Series Overview ................................................... 8

Series lineup ................................................................................................................ 8

Main Features ............................................................................................................. 9

Accessories ................................................................................................................ 10

Package Contents ..................................................................................................... 11

Appearance .................................................................. 12

2260B Front Panel ................................................................................................... 12

Rear Panel ................................................................................................................. 15

GETTING STARTED

This chapter describes the power supply in a nutshell, including its main features and front / rear panel introduction. After going through the overview, please read the theory of operation to become familiar with the operating modes, protection modes and other safety considerations.

2260B Series User Manual

Model name

Type

Voltage rating

Current rating

Power

2260B-30-36

360W models

0~30V

0~36A

360W

2260B-80-13

360W models

0~80V

0~13.5A

360W

2260B-30-72

720W models

0~30V

0~72A

720W

2260B-80-27

720W models

0~80V

0~27A

720W

360 Watt models

720 Watt models

2260B Series Overview

Series lineup

The 2260B series consists of 4 models, divided into 2 different model types covering 2 power capacities: 360W models and 720W models.

Apart from the differences in output, each unit differs in size. The 720W models are larger than the 360W models to accommodate the increase in power.

GETTING STARTED

Performance

 High performance/power  Power efficient switching type power supply  Low impact on load devices  Fast transient recovery time of 1ms  Fast output response time

Features

 OVP, OCP and OTP protection  Adjustable voltage and current slew rates  User adjustable bleeder control to quickly

dissipate the power after shutdown to safe levels.

 Extensive remote monitoring and control

options

 Support for serial and parallel connections  Power on configuration settings.  Web server monitoring and control

Interface

 Ethernet port  Analog connector for analog voltage and current

monitoring

 USB host and device port

Main Features

2260B Series User Manual

Standard Accessories

Part number

Description 196353000

Test Leads x1

174627900

USB Cable

020312300

Basic Accessories Kit: M4 terminal screws and washers x2, M8 terminal bolts, nuts and washers x2, Air filter x1, Analog control protection dummy x1, Analog control lock lever x1, Output terminal cover (top & bottom)

063453400

CD-R 2260B Manuals & Drivers

071305501

Quick Start Guide

PWRKI A*_

Power cord

071305700

China RoHS Declaration

001163200

Calibration of Traceable Certificate

001163300

Packing Check List

Optional Accessories

Part number

Description 2260B-EXTERM

Extended terminal

2260B-RMK-JIS

Rack mount adapter (JIS)

2260B-RMK-EIA

Rack mount adapter (EIA)

2260B-GPIB-USB

GPIB to USB adapter

Download

Name

Description

keithley_2260B.inf

USB driver

Accessories

GETTING STARTED

Opening the box

Contents (single unit)

 Main unit  Test leads x1  USB cable  Basic Accessories Kit  CD-R Manual  Quick Start Guide

 Power cord x1  China RoHS

Declaration

 Calibration of

Traceable Certificate

 Packing Check List

Package Contents

Check the contents before using the 2260B.

2260B Series User Manual

Current knob

Output key

Power switch

Voltage knob

USB A port

Display

Cover

panel

Function keys

2260B-80-13, 2260B-30-36 (360W)

Appearance

2260B Front Panel

2260B-80-27, 2260B-30-72 (720W)

GETTING STARTED

Function Keys

The Function keys along with the Output key will light up when a key is active.

The Function key is used to configure the power supply.

Set the overcurrent or overvoltage protection levels.

Sets the current and voltage limits.

Used to run customized Test sequence for testing.

Locks or unlocks the panel keys to prevent accidentally changing panel settings.

Toggles the display from viewing V/AV/WA/W.

Display Indicators

Voltage Slew Rate

Constant Voltage Mode

Remote Control Mode

Alarm on

Delay Output

Constant Current Mode

Current Slew Rate

Power bar Indicates the current power output

as a percentage.

VSR

C V

RMT

ALM

DLY

C C

ISR20406080

100

% W

2260B Series User Manual

Voltage Knob

Sets the voltage.

Current Knob

Sets the current.

Output

Press to turn on the output. The Output key will light up when the output is active.

USB

The USB A port is used to update the firmware. The firmware can only be updated at a service center.

Power Switch

Used to turn the power on/off.

GETTING STARTED

Rear Panel

2260B-80-27, 2260B-30-72 (720W)

2260B-80-13, 2260B-30-36 (360W)

2260B Series User Manual

Analog Control Connector

Standard 26 pin MIL connector (OMRON XG4 IDC plug).

The analog control connector is used to monitor current and voltage output, machine status (OVP, OCP, OTP etc.), and for analog control of the current and voltage output.

Use an OMRON XG5 IDC socket as the mating socket.

Output Terminals

Positive (+) and negative (-) output terminals.

Chassis ground

Sense (-) and Sense (+) terminals.

USB B port

The USB B port is used for remote control.

Fans

Temperature controlled fans

Ethernet Port

The Ethernet port is used for remote control and digital monitoring from a PC.

LAN

GETTING STARTED

Line Voltage Input

360W models: 2260B-30-36/2260B80-13

720W models: 2260B-30-72/2260B80-27

 Voltage Input: 100~240 VAC  Line frequency: 50Hz/60 Hz

(Automatically switchable)

2260B Series User Manual

Background

The 2260B power supplies are regulated DC power supplies with a high voltage and current output. These operate in CC (Constant voltage) or CV(Constant voltage) mode within a wide operating range limited only by the output power.

The operating area of each power supply is determined by the rated output power as well as the voltage and current rating. For example, the operating area and rated power output for the 2260B-30-36 is shown below.

Voltage

Current

360W rated power

12 36

Operating Area

When the power supply is configured so that the total output (current x voltage output) is less than the rated power output, the power supply functions as a typical constant current, constant voltage power supply.

If however, the power supply is configured such that the total output (current x voltage

Theory of Operation

The theory of operation chapter describes the basic principles of operation, protection modes and important considerations that must be taken into account before use.

Operating Area Description

GETTING STARTED

output) exceeds the rated power output, the effective output is actually limited to the power limit of the unit. In this case the output current and voltage then depend purely on the load value.

Below is a comparison of the operating areas of each power supply.

2260B 80V Series Operating Area

Current (A)

Voltage (V)

26.6

4.5 9.0 13.5

720W models

360W models

40205

2260B 30V Series Operating Area

Current (A)

Voltage (V)

0 20

100

12 24 36

120

720W Models

360W Models

2260B Series User Manual

CC and CV mode Description

When the power supply is operating in constant current mode (CC) a constant current will be supplied to the load. When in constant current mode the voltage output can vary, while the current remains constant. When the load resistance increases to the point where the current limit (I

SET

) can no longer be sustained the power supply switches to CV mode. The point where the power supply switches modes is the crossover point.

When the power supply is operating in CV mode, a constant voltage will be supplied to the load, while the current will vary as the load varies. At the point that the load resistance is too low to maintain a constant voltage, the power supply will switch to CC mode and maintain the set current limit.

The conditions that determine whether the power supply operates in CC or CV mode depends on the set current (I

SET

), the set voltage

SET

), the load resistance (RL) and the critical resistance (RC). The critical resistance is determined by V

SET/ISET

. The power supply will operate in CV mode when the load resistance is greater than the critical resistance. This means that the voltage output will be equal to the V

SET

voltage but the current will be

less than I

SET

. If the load resistance is reduced to the point that the current output reaches the I

SET

level, the power supply switches to CC

mode.

CC and CV Mode

GETTING STARTED

Conversely the power supply will operate in CC mode when the load resistance is less than the critical resistance. In CC mode the current output is equal to I

SET

and the voltage output is

less than V

SET

RL=R

RL<R

VSET

ISET

RL>R

Crossover

point

2260B Series User Manual

Theory

The 2260B has selectable slew rates for CC and CV mode. This gives the 2260B power supply the ability to limit the current/voltage draw of the power supply. Slew rate settings are divided into High Speed Priority and Slew Rate Priority. High Speed Priority mode disables slew rate settings for CC or CV mode. Slew Rate Priority mode allows for user adjustable slew rates for CC or CV mode. The rising and falling slew rate can be set independently.

Slew rate=

Disabled

Slew rate =

Enabled

Background

The 2260B DC power supplies employ a bleed resistor in parallel with the output terminals.

Power supply

Load

Bleed

resistor

Bleed resistors are designed to dissipate the power from the power supply filter capacitors when power is turned off and the load is disconnected. Without a bleed resistor, power

Slew Rate

Bleeder Control

GETTING STARTED

may remain charged on the filter capacitors for some time and be potentially hazardous.

In addition, bleed resistors also allow for smoother voltage regulation of the power supply as the bleed resistor acts as a minimum voltage load.

The bleed resistance can be turned on or off using the configuration settings.

Note

By default the bleed resistance is on. For battery charging applications, be sure to turn the bleed resistance off as the bleed resistor can discharge the connected battery when the unit is off.

Background

On the 2260B, the internal resistance of the power supply can be user-defined in software. (Internal Resistance Setting, page 87). When the internal resistance is set it can be seen as a resistance in series with the positive output terminal. This allows the power supply to simulate power sources that have internal resistances such as lead acid batteries.

Internal Resistance Range

Unit Model

Internal Resistance Range

2260B-30-36

0.000 ~ 0.833Ω

2260B-30-72

0.000 ~ 0.417Ω

2260B-80-13

0.000 ~ 5.926Ω

2260B-80-27

0.000 ~ 2.963Ω

Internal Resistance

2260B Series User Manual

OVP

Overvoltage protection (OVP) prevents a high voltage from damaging the load.

OCP

Overcurrent protection prevents high current from damaging the load.

OTP

Overtemperature protection protects the instrument from overheating.

Power Switch Trip

When the Power Switch Trip configuration setting is enabled, the power supply will automatically shut down when a protection setting has been tripped (OCP, OVP, OTP).

Alarm output

Alarms are output via the analog control connector. The alarm output is an isolated open-collector photo coupler output.

Alarms

The 2260B power supplies have a number of protection features. When one of the protection alarms are set, the ALM icon on the display will be lit. For details on how to set the protection modes, please see page 43.

GETTING STARTED

Inrush current

When the power supply switch is first turned on, an inrush current is generated. Ensure there is enough power available for the power supply when first turned on, especially if a number of units are turned on at the same time.

Caution

Allow at least 15 seconds between cycling the power. Cycling the power on and off quickly can cause the inrush current limiting circuit to fail as well as reduce the working life of the input fuse and power switch.

Pulsed or Peaked loads

When the load has current peaks or is pulsed, it is possible for the maximum current to exceed the mean current value. The 2260B power supply ammeter only indicates mean current values, which means for pulsed current loads, the actual current can exceed the indicated value. For pulsed loads, the current limit must be increased, or a power supply with a greater capacity must be chosen. As shown below, a pulsed load may exceed the current limit and the indicated current on the power supply ammeter.

Considerations

The following situations should be taken into consideration when using the power supply.

2260B Series User Manual

Current limit

level

Measured

Ammeter

current

Reverse Current: Regenerative load

When the power supply is connected to a regenerative load such as a transformer or inverter, reverse current will feed back to the power supply. The 2260B power supply cannot absorb reverse current. For loads that create reverse current, connect a resistor in parallel to the power supply to bypass the reverse current. This description only applies when the bleed resistance is off.

Power Supply

Load

Resistor

Reverse current

Note

The current output will decrease by the amount of current absorbed by the resistor.

Ensure the resistor used can withstand the power capacity of the power supply/load.

GETTING STARTED

Reverse Current: Accumulative energy.

When the power supply is connected to a load such as a battery, reverse current may flow back to the power supply. To prevent damage to the power supply, use a reverse-currentprotection diode in series between the power supply and load.

Power supply

Load

Diode

CAUTION

Ensure the reverse withstand voltage of the diode is able to withstand 2 times the rated output voltage of the power supply and the forward current capacity can withstand 3 to 10 times the rated output current of the power supply.

Ensure the diode is able to withstand the heat generated in the following scenarios.

When the diode is used to limit reverse voltage, remote sensing cannot be used.

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