HP 54510a schematic

OPERATING AND

SERVICE MANUAL

Relay Accessories

Agilent Models 59510A, 59511A

Agilent Part No. 5957-6382

Serial Numbers:

Agilent Model 59510A, Serials US29080101 and Above Agilent Model 59511A, Serials US29060101 and Above

* This manual also applies to instruments with the older serial number format described on page 7.

Microfiche Part No. 5957-6383 Printed in USA: April, 1988

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies Company assumes no liability for the customer’s failure to comply with these requirements.

BEFORE APPLYING POWER.

Verify that the product is set to match the available line voltage and the correct fuse is installed.

GROUND THE INSTRUMENT.

This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a threeconductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. For instruments designed to be hard-wired to the ac power lines (supply mains), connect the protective earth terminal to a protective conductor before any other connection is made. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earthed pole) of the ac power lines (supply mains).

FUSES.

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not use repaired fuses or short circuited fuseholders. To do so could cause a shock or fire hazard.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before touching components.

DO NOT SERVICE OR ADJUST ALONE.

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT EXCEED INPUT RATINGS.

This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded receptacle to minimize electric shock hazard. Operation at line voltages or frequencies in excess of those stated on the data plate may cause leakage currents in excess of 5.0 mA peak.

SAFETY SYMBOLS.

Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual (refer to Table of Contents) .

Indicates hazardous voltages. Indicate earth (ground) terminal.

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.

Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features are maintained.

Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.

General Information...............................................................................................................................................................5

Introduction .......................................................................................................................................................................... 5

Description (Figure 1-1) .......................................................................................................................................................5

Specifications........................................................................................................................................................................7

Safety Considerations........................................................................................................................................................... 7

Instrument and Manual Identification...................................................................................................................................7

Options ................................................................................................................................................................................. 7

Installation.............................................................................................................................................................................10

Introduction ........................................................................................................................................................................ 10

Initial Inspection.................................................................................................................................................................10

Mounting ............................................................................................................................................................................ 10

Surface Mounting ...........................................................................................................................................................10

Option 850 Mounting ..................................................................................................................................................... 11

Input Power Requirements..................................................................................................................................................12

Power Cord.........................................................................................................................................................................13

Connections and Operating Information............................................................................................................................15

Introduction ........................................................................................................................................................................ 15

Agilent 595lXA Front Panel...............................................................................................................................................15

DC Power Connections.......................................................................................................................................................17

Sense Lead Connections.....................................................................................................................................................18

Remote Sensing.............................................................................................................................................................. 18

Local Sensing (Figure 3-3).............................................................................................................................................19

Agilent 603XA Configuration ............................................................................................................................................19

Switch Settings...............................................................................................................................................................20

CONFIG Switches......................................................................................................................................................20

RLY LINK or INH/ FLT Switch ................................................................................................................................22

Agilent 603XA/5951XA Serial Data Connection...........................................................................................................22

Agilent 603XA/5951XA Configuration Wake-Up State ................................................................................................22

Remote Inhibit (INH) and Fault (FLT) Lines .................................................................................................................23

INH Input Line ........................................................................................................................................................... 24

FLT Output Line......................................................................................................................................................... 24

Using INH and FLT with Multiple Agilent 603XA/5951XA’s................................................................................... 24

Agilent 603XA Status PoII.............................................................................................................................................24

Agilent 603XA/5951XA Turn-On Sequence.................................................................................................................. 25

General Purpose Configuration........................................................................................................................................... 26

Switch Settings...............................................................................................................................................................27

Agilent 603X LINK or LOGIC CONTROL Switch................................................................................................... 27

Listen Enable Switch.................................................................................................................................................. 27

TTL Input Connections...................................................................................................................................................27

LISTEN ENABLE Input............................................................................................................................................ 28

OPEN/CLOSE Signal.................................................................................................................................................28

NORM/REVInput (Applies only to Agilent Model 59511A)..................................................................................... 28

Remote Inhibit (INH) and Fault (FLT) Lines ................................................................................................................. 28

Agilent 603XA Programming Commands.......................................................................................................................... 31

Introduction ........................................................................................................................................................................ 31

Changed Command............................................................................................................................................................. 32

Output On/Off................................................................................................................................................................. 32

Added Commands............................................................................................................................................................... 34

DC On/Off...................................................................................................................................................................... 34

Relay On/Off .................................................................................................................................................................. 35

Polarity Normal/Reverse (Model 59511A only).............................................................................................................35

Maintenance..........................................................................................................................................................................37

Introduction ........................................................................................................................................................................ 37

Circuit Operation................................................................................................................................................................ 37

Main Circuit Board.........................................................................................................................................................37

Control Circuits .......................................................................................................................................................... 37

Bias Supply................................................................................................................................................................. 38

Power-on Circuit......................................................................................................................................................... 38

Relays............................................................................................................................................................................. 39

Verification.........................................................................................................................................................................40

Relay Control Verification (TTL Mode) ........................................................................................................................ 40

DC Power Relay Verification.........................................................................................................................................41

Removal and Replacement Procedures............................................................................................................................... 42

Cover .............................................................................................................................................................................. 42

Assembly Removal......................................................................................................................................................... 43

Main Circuit Board Removal.......................................................................................................................................... 43

Troubleshooting Procedures ............................................................................................................................................... 43

Test Setup....................................................................................................................................................................... 43

Bias Supply and Power-On Circuit................................................................................................................................. 44

Microprocessor U101 ..................................................................................................................................................... 44

Relay Circuits.................................................................................................................................................................45

Agilent Model 59510A............................................................................................................................................... 45

Agilent Model 59511A............................................................................................................................................... 45

FLT and INH Circuits..................................................................................................................................................... 46

Parts List.............................................................................................................................................................................47

Agilent Sales and Support offices........................................................................................................................................56

General Information

Introduction

This manual contains instructions for installing, operating and troubleshooting the Agilent Model 59510A and 59511A Relay Accessories. Each of these models is designed for use with the Agilent 6030A, 6032A, 6033A, and 6038A models in the Agilent 603XA series of system power supplies. The Agilent 59510A and Agilent 59511A Relay Accessories can be used with Agilent 603XA supplies that have the following serial numbers:

Agilent Model Serial Numbers *

6030A 2811A-00815 and above

6031A** 2817A-00983 and above

6032A 2818A-03121 and above 6033A 2817A-03452 and above 6038A 2817A-05426 and above

* Models with lower serial numbers can be modified to operate with the Agilent 595XA Relay Accessory. Consult Agilent

regarding a retrofit kit for these models.

**When the Agilent 5951XA Relay Accessory is to be used with the Agilent 6031A System DC Power Supply, care must be

taken to set the Agilent 6031A’s current limit to 60 A or less. The Agilent 6031A power supply is capable of delivering an output current in excess of Agilent 5951XA’s rating of 60 A, which could cause damage to the Relay Accessory.

Wherever applicable, the instructions given in this manual refer to pertinent information provided in the Operating and Service Manual for the appropriate Agilent 603XA power supply as follows:

Agilent Model Manual Agilent P/N

6030A 06030-90003 6031A 06031-90003 6032A 06032-90005 6033A 06033-90010 6038A 06038-90003

The Relay Link Supplement, Appendix F (Agilent Part No. 5957-6388) to the above manuals, describes circuit changes to the Agilent 603X supplies which allow use of the supplies with the Agilent 59510A/59511A. The Agilent 59510A/59511A Relay Accessory has a logic control input (TTL levels) that allows it to be used with power supplies or devices other than the supplies specified above. Instructions for using the logic control input in a general purpose configuration are given in Section 3 of this manual.

Description (Figure 1-1)

The Agilent 59510A and 59511A Relay Accessories are intended for use in power supply applications where either or both load isolation (connect/disconnect) and polarity reversal are required.

The Agilent 59510A Relay Accessory provides for load connect/disconnect for both the power output and sense leads of the power supply. The Agilent 59511A Relay Accessory provides for polarity reversal as well as for load connect/disconnect for both power output and sense leads. In addition, each model includes a fault (FLT) output line and a remote inhibit (INH) input line. The FLT output line provides a fault reporting capability that is independent of the GPIB service request (SRQ)

General Information

function. The INH input line provides a way to remotely disconnect (also independent of GPIB computer control) the power supply output.

Figure 1-lA shows the Agilent 59510A/59511A Relay Accessory configured with an Agilent 603XA power supply. A GPIB interface in the Agilent 603XA power supply recognizes relay commands from the computer and provides serial data to the Agilent 59510A/59511A via a special connection labeled RLY LINK. The Agilent 5951XA converts the serial data into relay control signals.

The computer can control the connect/disconnect and polarity reversal (Agilent 59511A only) functions via the Agilent 603XA supply’s serial data link to the Agilent 59510A/59511A. The closing and opening of the relays in the Agilent 59510A/59511A can be coordinated with the enabling and disabling of the power supply output to allow switching the relays when the power supply output is disabled in order to prolong relay life. The microprocessor within the Agilent 59510A/59511A Relay Accessory properly sequences the power and sense relays to minimize overshoots at the power supply output.

Figure 1-lB shows the Agilent 59510A/59511A Relay Accessory configured in a general purpose application. This configuration allows the Agilent 59510A/59511A to be used with power supplies or devices other than Agilent 603XA power supplies. Logic control inputs are provided that allow TTL logic levels to control the connect/disconnect and polarity reversal (Agilent 59511A) functions. The logic control inputs have pull-up resistors which allow them to accept signals from relays or open-collector devices.

The Agilent 59510A/59511A Relay Accessory is designed to fit in a rack height of 5¼ inches and is approximately 7¼ inches wide and 8 inches deep. All necessary connections are made at the front panel.

General Information

Figure 1-1. Agilent 59510A/59511A Configurations

Specifications

Table 1-1 lists the specifications for the Agilent 59510A/59511A Relay Accessories. The 603XA power supply specifications are listed in the applicable manual (see page 1).

Safety Considerations

This product is a Safety Class 1 instrument, which means that it is provided with a protective earth terminal. The instrument and this manual should be reviewed for safety markings and instructions before operation. Refer to the Safety Summary page at the beginning of this manual for a summary of general safety information. Safety information for specific procedures is located at appropriate places in the manual.

The Agilent 5951XA Relay Accessory contains mercury displacement relays. Because mercury is a hazardous material, defective relays must be disposed of properly (refer to page 38).

Agilent Technologies power supplies are designed to comply will the following regulatory standards: IEC 348, VDE 0411, CSA 556B, VDE 0871/6.78 level B (FTZ 1046/84), UL1244.

Instrument and Manual Identification

Agilent Technologies instruments are identified by a 10-digit serial number. The first two letters indicate the country of manufacture. The next four digits are a code that identify either the date of manufacture or of a significant design change. The last four digits are a sequential number assigned to each instrument.

Older serial number formats used with these instruments had a two-part serial number, i.e. 2701A-00101. This manual also applies to instruments with these older serial number formats.

If the serial number prefix on your Relay Accessory differs from that shown on the title page of this manual, a yellow Manual Change sheet that is supplied with the manual defines the differences between your unit and the unit described in this manual. The yellow change sheet may also contain information for correcting errors in the manual.

Options

850: One rack mount kit. 910: One extra operating and service manual shipped with each Relay Accessory. W30: 2 year additional Return-to-Agilent Service.

General Information

Table 1-1. Agilent Model 59510A and 59511A Specifications

Operating Range: (Both Models)

Inductive Load: 10mH maximum

Note that switching of inductive loads places stresses on the Agilent 5951XA power relay contacts which can significantly degrade relay life. It is advisable to switch these loads under low or zero output conditions, e.g. with the power supply output disabled. In general, switching any load under zero output conditions maximizes relay life.

For applications with > 10 mH inductance, consult Agilent Technologies for applicability and safety. Using the Agilent 5951XA relays to interrupt high currents through highly inductive loads will cause high levels of energy to discharge across the relay contacts. The resulting rise in temperature and pressure may cause a breach in the hermeticity of the seals in the mercury-filled cylinders of the power relays. Since mercury is a toxic substance, this is a potentially hazardous condition. Care should be taken in all applications not to exceed the operating range specifications in order to avoid compromising the reliability or the physical integrity of the mercury-displacement relays in the Agilent 5951XA. FOR THESE REASONS, THE AGILENT 5951XA SHOULD NOT BE USED WITH THE AGILENT 603XA HIGH INDUCTANCE OPTIONS J01, J02. AND J07.

Agilent Model PARD (mVp-p max).

6032A 20 6033A 20 6038A 20

Isolation:

A IN/B IN to A OUT/B OUT: 200Vdc max. A IN/B IN/A OUT/B OUT to Ground: ± 500Vdc max. Agilent 603X LINK to Ground: ± 42Vdc max. *LOGIC CONTROL/INH to Ground: ± 240Vdc max. *FLT to Ground: ± 240Vdc max. FLT to LOGIC CONTROL/INH ±42Vdc max.

The Agilent 603X LINK, LOGIC CONTROL, and INH signals on the control connector J101 are referenced to the same common. This means that if the Agilent 5951XA relay accessory is being used in the Agilent 603XA configuration (see page 16), these signals on the control connector J101 must be restricted to ± 42Vdc from ground, in accordance with the restrictions of the Agilent 603XA FLT/INH port float voltage specification (refer to appropriate Agilent 603XA Operating and Service Manual). The FLT signal on J101 has its own common which may float ± 42Vdc from the other; signal common on J101

and up to ± 240Vdc from ground. The LOGIC CONTROL, INH, and FLT signals may be floated up to ± 240Vdc from ground ONLY if they are not driven by or driving signals of the FLT/INH port of an Agilent Technologies instrument AND the Agilent 603X LINK signals are left disconnected.

As a general rule, if a connection is made from any point on control connector J101 to any point or the FLT/INH port of an Agilent Technologies instrument, all signals on J101 must be restricted to no greaser than ± 42Vdc from ground.

AC Input: A line select switch on the front panel permits

either 100/120Vac or 220/240Vac operation ( - 13%, + 6% 48-63 Hz).

General Information

Settling Time (TTL Control):

Connect: 440 mS Disconnect: 160 mS Polarity Reversal: 600 mS

Table 1-1. Agilent Model 59510A and 59511A Specifications (continued)

Maximum Input power: 60VA

PARD: The Agilent 5951XA Relay Accessory incorporates

a filter which, when used with certain models of the Agilent 603XA power supply family, yields improved output noise performance at the AOUT/BOUT terminals of the Agilent 5951XA.

Control Signals Timing:

INH input signal hold time:

1.5 ms minimum LOGIC CONTROL inputs (TTL levels) hold time:

1.5 ms minimum to FLT propagation: 1.5 ms maximum

INH

Temperature:

Operating: 0 to +55 degrees Celsius Storage: -40 to +75 degrees Celsius

DC Voltage Drop (at 60A): DC voltage drop of 0.5V

maximum between A IN and A OUT and 0.5V maximum between B IN and B OUT.

Dimensions: (Both Models)

Width Height Depth

7.35 in. 5.14 in. 7.82 in.

186.8 mm 130.6 mm 198.6 mm

Weight (lbs): 59510A 59511A Net Weight: 5 8 Shipping Weight: 8 11 Shipping Weight 9 12 with Option 850:

Mounting Orientation: ± 10° from vertical

General Information

Installation

Introduction

This section contains instructions for inspecting and mounting the Relay Accessory, and connecting it to ac power.

Initial Inspection

This accessory was thoroughly inspected and tested before it left the factory. As soon as you receive it, remove it from its packing case and check to make sure that it has not been damaged in shipment. Check that there are no broken connectors, etc., and that the unit is free from dents and scratches.

If any damage is found, you should file a claim with the carrier immediately and notify the Agilent Technologies Sales and Service office nearest you. Keep the original packing materials for the carrier’s inspection or in the event the unit has to be returned to Agilent Technologies. Warranty information is printed on the inside cover of this manual. Your Agilent Technologies Sales and Service office will furnish the address of the nearest service office to which the unit can be shipped.

Mounting

The Relay Accessory units utilize mercury displacement relays. Consequently, the units must be vertically mounted (or oriented) to ensure proper operation and avoid damage to equipment (See Table

1-1 Specifications).

The Relay Accessory unit is convection cooled and can operate without loss of performance within the temperature range of 0 to 55 degrees C. If the unit is to be used on a bench or any flat surface, attach the four adhesive backed rubber feet to the bottom of the Agilent 5951XA unit. The feet are shipped in a plastic bag along with two quick disconnect plugs and spare fuses.

The unit can also be mounted in a standard 19 inch rack panel or enclosure. It can be rack mounted in either of two ways:

1. Drilling two holes in the mounting surface and using screws to engage the threaded inserts in the bottom of the Agilent

5951XA.

2. Using the Option 850 Rack Mounting Kit.

Ventilation holes are located on both sides of the Agilent 5951XA as well as in the back. Make sure that the back and at least one side is left unobstructed. Failure to do so could cause overheating and damage.

10 Installation

Surface Mounting

The Agilent 5951XA can be mounted against surfaces by means of machine screws. There are two threaded inserts on the bottom of the Agilent 5951XA (see Figure 2-1). The user must drill two holes in the surface against which the Agilent 5951XA is to be mounted and pass M4 screws (10 mm long) through these holes to engage the threaded inserts within the Agilent 5951XA. Remember to keep the Agilent 5951XA oriented vertically (see Mounting Orientation in Table 1-1) for proper operation.

Figure 2-1. Threaded Insert Locations for Surface Mounting

Option 850 Mounting

Rack mount kit Option 850 can be used to mount a single Agilent 5951XA unit on the left or right side of the rack as shown in Figure 2-2. Two units can be mounted side by side in the rack using two Option 850 kits.

The Agilent 5951XA unit rests on the Option 850 rack as shown in Figure 2-2. Two threaded inserts, located on the bottom of the Agilent 5951XA, line up with holes in the rack. Use two flat head M4 screws (10 mm long) to secure the unit in the rack.

Installation 11

Figure 2-2. Option 850 Rack Mounting

Input Power Requirements

You can operate the unit from a nominal 100V, 120V, 220V, or 240V single phase power source at 48 to 63Hz. You can check the line voltage setting of the unit by examining the LINE SELECT switch S101 setting (see Figure 2-3). You can change the unit to accept 100, 120, 220, or 240Vac by setting S101 to the 100/120V or 220/240V position. The same rating fuse (0.5A) is used for a 110,120, 220, or 240Vac input. The fuse, designated F1, is located inside the unit near the LINE SELECT switch.

Note The Agilent 5951XA has no on/off switch. To turn the unit on/off, you must connect/disconnect the power

cord.

12 Installation

Figure 2-3. Relay Accessory Front Panel

Power Cord

The unit is shipped from the factory with a power cord that has a plug appropriate for your location. Figure 2-4 shows the standard configuration of plugs used by Agilent Technologies. Below each drawing is the Agilent part number for the replacement power cord equipped with a plug of that configuration. If a different power cord is required, contact the nearest Agilent Technologies Sales and Service office.

Installation 13

Figure 2-4. Available Power Cords

For your protection, the National Electrical Manufacturer’s Association (NEMA) recommends that the unit’s panel and cabinet be grounded. This unit is equipped with a three-conductor power cord; the third conductor being ground. The unit is grounded only when the power cord is plugged into the appropriate receptacle. Do not operate this unit without an adequate cabinet ground connection.

SHOCK HAZARD Connect the power cord to a grounded receptacle before you connect any external floating voltages to the Relay Accessory.

The offset pin on the standard three-prong power cord connector is the ground connection. If a two-contact receptacle is encountered, it must be replaced with a properly grounded three-contact receptacle in accordance with the National Electrical Code, local codes and ordinances. The work should be done by a qualified electrician.

14 Installation

Connections and Operating Information

Introduction

HAZARDOUS MATERIAL The DC power relay(s) in the Agilent 5951XA have a maximum current rating of 60 amps. The relays contain mercury which is sealed in a steel tube. The tubes may rupture if the

current rating is exceeded. Do not connect the Agilent 5951XA to a power supply capable of delivering more than 60 amps.

This section explains how to make connections and set switches in order to operate the Agilent 5951XA Relay Accessory in an Agilent 603XA configuration and in a general purpose configuration. The following main discussions are provided:

•

Agilent 5951XA Front Panel

•

DC Power Connections

•

Sense Lead Connections

•

Agilent 603XA Configuration

•

General Purpose Configuration

Agilent 595lXA Front Panel

Figure 3-1 illustrates the front panel of the Agilent 5951XA where connections and switch selections are made.

Figure 3-1. Agilent 59510A/59511A Front Panel Connections

Connections and Operating Information 15

DC POWER Connections --

A barrier block (TB1) with four screw-down type terminals connects the input and output dc power wires. The A IN and B IN terminals are used to connect the Relay Accessory to the power supply’s + and output terminals, respectively. The A OUT and B OUT terminals are used to connect the Relay Accessory to the load. See page 3.

SENSE Connections --

Control Connections --

A four pin connector J201 (quick disconnect mating plug P201 supplied) connects the input and output sense leads. The A IN and B IN pins (1 and 2) are used to connect the Relay Accessory to the power supply’s + S and - S terminals, respectively. The A OUT and B OUT pins (3 and 4) are used to connect the Relay Accessory to the load’s + and sense leads, respectively. See pages 14 and 15.

A ten pin connector J101 (quick disconnect mating plug P101 supplied) is provided for making the following connections:

Agilent 603X LINK(pins 1-2): These two pins provide the serial data link with the Agilent 603XA supply to control the Relay Accessory (see page 18).

common (pin 3): provides the common connection for the serial data link or the logic

control input.

LOGIC CONTROL (pins 4-6): These three pins are used for connecting TTL compatible signals to control the Relay Accessory when it is used in a general purpose configuration (see page 22).

FLT (pins 7 and 8): These two pins are used to connect the fault output line. See page 19 (Agilent 603X configuration) or page 24 (general purpose configuration). Pin 7 is the FLT output signal, pin 8 is its common.

INH (pins 9 and 10): These two pins are used to connect the inhibit input line. See page 19 (Agilent 603X configuration) or page 23 (general purpose configuration). Pin 9 is the INH input signal; pin 10 is its common.

CONFIG Switches --

16 Connections and Operating Information

Four switches (S102-1 to 4), each of which can be set to ’’1" or ’’0", make the following

Listen Enable On/Off (S102-1): This switch is meaningful only in the LOGIC CONTROL mode. With S102-1 set to "0", the Relay Accessory will always respond to the LOGIC CONTROL lines. With S102-1 set to ’’1’’, the Relay Accessory will only respond to the LOGIC CONTROL lines when the LISTEN ENABLE input U101-6) is a TTL low level. S102-1 is factory set to ’’0’’.

Agilent 603X LINK or LOGIC CONTROL (S102-2): This switch selects either Agilent 603X LINK (serial data) or LOGIC CONTROL (TTL levels) as the controlling input. The "1" position selects the Agilent 603X LINK and the "0" position selects LOGIC CONTROL. S102-2 is factory set to ’’1’’.

Addresses A1 and A0 (S102-3 and 4): These switches are meaningful only in the Agilent 603X LINK mode to select the address of the Relay Accessory. S102-3 and S102-4 are both factory set to "0’’. The Agilent 603X power supplies currently will only communicate with a Relay Accessory at address "0’’. Addresses 1-3 are provided for possible future use.

Figure 3-2. DC Power and Sense Lead Connections Remote Sensing

SHOCK HAZARD Turn off input ac power at the power supply and disconnect the Relay Accessory’s line cord before changing any connections. Make certain that all wires are properly connected, screws are

tightened, and connectors securely installed before reapplying power.

DC Power Connections

The dc power connections between the power supply and the Relay Accessory and between the load and the Relay Accessory are shown in Figure 3-2. The power supply’s output terminals are connected to the Relay Accessory’s DC POWER input terminals and the load leads are connected to the Relay Accessory’s DC POWER output terminals as follows:

Relay Accessory

DC POWER Terminal

A IN

B IN A OUT B OUT

The dc power wires are connected to the screw-down terminals on the DC POWER barrier block TB1 as specified above. Each wire is inserted into the appropriate terminal and the corresponding screw is tightened until the wire is securely fastened (see Figure 3-1).

Connects To

Power Supply +

Power Supply -

Load +

Load -

Connections and Operating Information 17

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