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 Greate r Measur e of Confidenc e

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
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

1

	2260B Series User Manual
2260B	Specifications ..........................	139
2260B	Dimensions .............................	145
Declaration of Conformity ..................		147
INDEX............................................................................		148

2

SAFETY INSTRUCTIONS

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.

Warning: Identifies conditions or practices that

	WARNING	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

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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.

Safety Guidelines

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.

4

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		Location: Indoor, no direct sunlight, dust free,
Environment		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		Location: Indoor
environment		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.

5

Earth Neutral Live (Phase)

2260B Series User Manual

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:

Green/ Yellow: Blue:

Brown:

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.

6

GETTING STARTED

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 Overview	................................................... 8
Series lineup ................................................................................................................	8
Main Features .............................................................................................................	9
Accessories................................................................................................................	10
Package Contents.....................................................................................................	11
Appearance ..................................................................	12
2260B Front Panel...................................................................................................	12
Rear Panel .................................................................................................................	15

7

2260B Series User Manual

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.

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

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.

360 Watt models

720 Watt models

8

GETTING STARTED

Main Features

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

9

			2260B Series User Manual
	Accessories
	Standard	Part number	Description
	Accessories
		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	Part number	Description
	Accessories
		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

10

GETTING STARTED

Package Contents

Check the contents before using the 2260B.

Opening the box

Contents		Main unit		Power cord x1
(single unit)		Test leads x1		China RoHS
		USB cable		Declaration
		Basic Accessories Kit		Calibration of
				Traceable Certificate
		CD-R Manual
				Packing Check List
		Quick Start Guide

11

2260B Series User Manual

Appearance

2260B Front Panel

2260B-80-27, 2260B-30-72 (720W)
	Voltage
Display	knob
	Current
Cover	knob
panel	Output
	key
Power
switch	Function
	keys

USB A port

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

12

GETTING STARTED

Function Keys

Display

Indicators

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.
VSR			Voltage Slew Rate
C V			Constant Voltage Mode
RMT			Remote Control Mode
ALM			Alarm on
DLY			Delay Output
C C			Constant Current Mode
ISR			Current Slew Rate
20	40	60	Power bar
80	100	% W	Indicates the current power output
			as a percentage.

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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.

14

GETTING STARTED

Rear Panel

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

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

15

	2260B Series User Manual
Analog Control	Standard 26 pin MIL connector
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

LAN

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

16

	GETTING STARTED
Line Voltage	360W models: 2260B-30-36/2260B-
Input	80-13
	720W models: 2260B-30-72/2260B-
	80-27
	Voltage Input: 100~240 VAC
	Line frequency: 50Hz/60 Hz
	(Automatically switchable)

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2260B Series User Manual

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

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			Operating Area
	30
					360W rated power
	10
							Current
	12			36

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

18

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

		4.5	9.0	13.5		27
	90
	80									80
<![if ! IE]> <![endif]>(V)	60
<![if ! IE]> <![endif]>Voltage	40							360W models
								720W models
						30				26.6
	20
						25
						15
	0					…Po…
	0	5	10	15	20	25	30	35	40	45
					CurrenVolt(A)		120468	0

2260B 30V Series Operating Area

	12	24	36		72
	35
	30							30
<![if ! IE]> <![endif]>(V)	25						360W Models
	20						720W Models
<![if ! IE]> <![endif]>Voltage
	15
	10			30				10
	5
				25
				15
	0			…Po…
	0	20	40	60		80	100	120
				CurrenVolt(A)	120468	0

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2260B Series User Manual

CC and CV Mode

CC and CV mode When the power supply is operating in Description 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 (ISET) 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 (ISET), the set voltage (VSET), the load resistance (RL) and the critical resistance (RC). The critical resistance is determined by VSET/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 VSET voltage but the current will be less than ISET. If the load resistance is reduced to the point that the current output reaches the ISET level, the power supply switches to CC mode.

20

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 ISET and the voltage output is less than VSET.

V
	CV	RL=RC
VSET
		Crossover
RL>RC		point
		CC
	RL<RC
		I
		ISET

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	2260B Series User Manual
Slew Rate
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

Bleeder Control

Background	The 2260B DC power supplies employ a bleed
	resistor in parallel with the output terminals.
	Power	Bleed	Load
	supply	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

22

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.

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

the connected battery when the unit is off.

Internal Resistance

Background

Internal

Resistance Range

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.

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

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2260B Series User Manual

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.

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.

24

GETTING STARTED

Considerations

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

	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	When the load has current peaks or is pulsed, it
	loads	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.

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2260B Series User Manual

Current limit level

Measured

Ammeter

current

Reverse Current: When the power supply is connected to a Regenerative load 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	Resistor	Load
		Supply
		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.

26

		GETTING STARTED
	Reverse Current:	When the power supply is connected to a load
	Accumulative	such as a battery, reverse current may flow
	energy.	back to the power supply. To prevent damage
		to the power supply, use a reverse-current-

protection diode in series between the power supply and load.

Diode

	Power	Load
	supply

Ensure the reverse withstand voltage of the diode

CAUTION	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.

27