Megger DDA-1, DDA-3000, DDA-6001, DDA-6002, DDA-3001 Instruction Manual

INSTRUCTION MANUAL

I I

, I

For

i

CIRCUIT BREAKER

TEST

SETS

MODEL DDA-3000/6000

r·

\

It is essential before putting

that

this

the

equipment

instruction

in

service.

book

be read

thoroughly

by

the operator

or

the

test

equipment

PartNo._17177

Rev. 4, 7/3/02

Revision History

Revision

1 27168 2 27356 3 27999

4

ECN#

29358

Date

11/11/96 11/14/97

3/12198

7/3/02

The

information and data contained within this instruction manual are proprietary

property

one such proprietary information as well as all rights under any such patent, none is waived

The

equipment described were procured with "Limited Rights" to technical data as described

in

ASPR 9-203

Copyright

of

A

or

more

by

recipient,

AVO

VO

International.

U.

S.

patents. A

the submission

if

a Government agency, acknowledges that this instruction book and the

(b).

International

IMPORTANT

The

equipment described herein may be protected

VO

International specifically reserves to itself all rights

of

this instruction manual.

Inc.

1995, 1996, 1997

of

by

to

which

, i

TABLE OF CONTENTS

SECTION I ................................................................................................................................................................. 1

1.

INTRODUCTION .......................................................................................................................................... 1

A.

GENERAL DESCRIPTION & SPEFICATION BULLETIN ................................................................... 1

1.

DESCRIPTION

A.

GENERAL DESCRiPTION ...................................................................................................................... 4

B.

CONTROLS AND INSTRUMENTATION .............................................................................................. 4

SECTION III ............................................................................................................................................................... 9

1.

FRONT PANEL DISPLAY AND PROGRAMMING MENUS ................................................................... 9

2.

Flow Diagram

A.

METERING DISPLAY ............................................................................................................................

B.

MAIN MENU ............................................................................................................................................

C. D. E. F.

SECTION IV INPUT AND OUTPUT CIRCUITS ................................................................................................

1. A.

B. C. D.

2. A.

.B.

C.

SECTION V .............................................................................................................................................................

1.

2.

BREAKERS .........................................................................................................................................................

3.

RELAYS

4.

5.

6.

SECTION

2.

SECTION VII ...........................................................................................................................................................

1.

LCD CONTRAST MENU ...................................................................................................................

SCR CONTROL MENU .....................................................................................................................

PULSE DURATION AND FIRING ANGLE MENUS ..........................................................................

ACQUISITION CONTROL

INPUT: ..........................................................................................................................................................

INPUT VOLTAGE ...................................................................................................................................

INPUT LEADS .........................................................................................................................................

GROUNDING ......................................................................................................................................

SAFETY PRECAUTIONS ..................................................................................................................

OUTPUT ......................................................................................................................................................

SELECTION OF OUTPUT CONNECTIONS ......................................................................................

OUTPUT CONNECTIONS ....................................................................................................................

DUTY RATINGS AND OVERLOAD CAPACITIES ........................................................................

TEST PROCEDURES FOR TESTING TEST PROCEDURE FOR TESTING

MAINTENANCE OF PROTECTIVE APPARATUS MAINTENANCE OF MOTOR OVERLOAD

...............................................................................................................................................................

MAINTENANCE OF MOLDED CASE CIRCUIT BREAKERS ..............................................................

MAINTENANCE OF LOW VOLTAGE POWER CIRCUIT BREAKERS .............................................

SUGGESTED RECORD FORMS - INSPECTION AND TEST RESUL TS .........................................

VI

............................................................................................................................................................

SERVICE DATA ..........................................................................................................................................

SCHEMATIC DRAWiNG ...........................................................................................................................

of

CONTROLS

of

Display Menus ...............................................................................................................

and

MENU

INSTRUMENTATION ................................................................... 4

........................................................................................................

OF

MOTOR OVERLOAD RELAYS ......................................

OF

MOLDED CASE AND LOW VOLTAGE POWER CIRCUIT

10 10 10 11 11 11 12 14 14 14 14 14 14 14 14 15 16

19

19 22 26

29 31 33 34 34 37 37

I

I .

i

I

~

,

Megger

..

DDA-3000

Universal Circuit Breaker Test

and

DDA-6000

Sets

DDA-3000 Universal

and

DDA-6000

Circuit

Breaker

•

Model Instrumentation

•

High-current DDA-6000;

•

Digital

•

Variable

output

•

Compliant test

Test Sets

DDA-1

signal processing (DSP)

current

guidelines

Digital

and

output:

35,000 A for

pulse

time

control

with

NEMA

Data Control

60,000 A for

and

AB-4

Acquisition

System

Model

DDA-3000

technology

firing

angle

Model

I I

1-'

i

..

I'

I

DESCRIPTION

Incorporating Models specifically circuit breakers solid-state trip devices.

NEMA

with Tests are

condition. Each test

[

provides a variable, high-current output. The test sets incorporate all control circuitry necessary efficiently

The unique transformer high-capacity test set in a very compact size. Advanced control

APPLICATIONS

Universal all low-voltage, molded-case ac circuit breakers Westinghouse, Federal Pacific, Square D, Gould, ITE,

Siemens

Model

DDA-3000 is rated for testing breakers 3000 amperes. Model DDA-6000 breakers

Megger circuit trouble-free operation.

The test sets also applications,

the

latest technological advancements,

DDA-3000

performed

to and

and

instrumentation provides exact testing capacity.

in

up

and

DDA-6000 Series are designed

to

test low-voltage

equipped

AB-4 test guidelines.

by

set

test direct-acting circuit breakers accurately,

safely.

and

application,

produced

and

other

to 6000 amperes. Rugged

breaker

such

test sets will provide years

may

be

as verifying

power

and

molded-case

with thermal, magnetic

The

units are fully compliant

simulating is

an

the

manufacturers.

used

an

overload

integrated test system that

and

instrumentation

circuit design results in a very

test sets will test virtually

and

metal-clad, direct-acting

by

General Electric,

is

rated for testing

and

reliable,

for other high-current

the

ratio

of

current

up

or

ABB,

to

or

fault

digital

of

transformers testing protective relays.

All

Model DDA-3000

features, instrumentation

The

only changes

their size, weight

FEATURES

III Initiating

circuit provides modes automatically pulses pulse duration. This provides additional testing capabilities for electromechanical devices. A short pulse duration also limits of

the

In

the until manually device and

II

Zero

of

a contactor eliminates closing-time error initiation at current waveform every time. Initiation at crossover eliminating accurate, repeatable test results currents of

instantaneous

and

performing

of

high-voltage breakers

and

in

the specifications

and

AND

BENEFITS

control

of

output

breaker maintained mode,

under

de-energizes the output.

de

offset:

point

dc

of

very short duration, as

circuit: Fully digital initiating control

both

duration.

under

turned

test operates,

Use

to

initiate

the

zero crossover

ensures symmetrical

offset in

or

heat

DDA-6000 test sets have identical

and

maximum output-current capacity.

pulsed

The

the

output

test while setting

the

off or, during timing test, until the

of

digitally controlled

the

short-time delay trip elements.

runs

or

primary injection

and

their associated

operational characteristics.

among

and

maintained control

pulsed

mode

to

any

programmed

and

solid-state trip

the

output

remains energized

which

both

stops

output

of

the

and

thereby

point

of

the

output

current waveform. Therefore

are

assured

when

conducting tests

the

units are

the

preheating

test current.

the

timer

SCRs

instead

test

set

ensures precise

output

the

zero

current

even

by

with

Meggerm

The

Model

DDA-1 control

panel

digitally

s.amples

the

output

current

and

mathematically

calculates

DDA-3000

and

DDA-6000

Universal Circuit Breaker Test

the

current supplied

to

the

breaker

under

Sets

test.

The digital control initiate at crossover will allow

any point

the

waveform for a complete investigation

of

the

SCRs

also allows the unit

point

within 90 degrees

of

the

output-current waveform. This

intentional insertion

of

the zero

of

a dc offset into

of

a breaker's

operation.

•

Compact

enclosure:

Improvements

in

transformer circuit design have resulted in a very high-capacity test set

in

a single, relatively small enclosure. For safety mobility, metal enclosure with a lifting eyes

the

test

set

is

housed low

and

large, locking swivel casters with brakes.

in a single, rugged,

center

of

gravity,

tow

ring,

To increase maneuverability, all four casters swivel;

they

also

can

be

however, easily. The movement

compact

through

locked into a fixed pOSition

size

of

test sets permits easy

narrow doors. Controls

and instrumentation are positioned so that the operator Simultaneously observe

•

Construction:

operation,

Built for years

the

test sets include rugged instrumentation and controls designed to withstand shock

of

frequent transportation. They

removed from

the

• Protection: Fuse, circuit breaker

the

circuit breaker

enclosure .

under

of

trouble-free, reliable

the

vibration

need

never

and

overload

test.

and

protective devices are incorporated. The output-initiating SCRs

are forced-air cooled, provide protection from overheating. Emergency pushbutton is

provided

and

temperature sensors

to de-energize all

input

stop

power

the test set.

•

Ground

that before

•

Accessory

outlet with a capacity convenient

safety

the

test

the

set

chassis

output

interlock:

of

An

interlock circuit ensures

is

connected to system

the

test

set

can

be

outlet: A ground-fault-protected, 120 volt

of

1.2

kVA

is

proVided for

connection

of

accessory equipment.

ground

energized.

Other voltages are available internally for customer-installed outlets.

INSTRUMENTATION

Model

DDA-l:

instrumentation

AND

CONTROLS

The

Digital Data Acquisition

and

control system was deSigned

to

the

and

sheet

can

be

specifically and

to

provide precise control

accurate metering

of

the

breaker

of

the

under

Model DDA-1 uses the latest in digital signal processing (DSP) technology. This technology provides complete digital control

of

the

SCRs

and

digitally samples

current for high-accuracy measurements.

Digital

current digitally that is supplied to increases provides extreme flexibility in displayed. For example, continuous current, the digital sampling value

ammeter:

the

of

the

current.

Model DDA-1 samples

and

mathematically calculates

the

breaker

accuracy

of

the

ammeter systems

when

output

waveform

under

test. This process

what

current value is

the

test

set

ammeter

and

can

the

is is continuously display a true rms

For measuring short-duration currents, Model DDA-1 can calculate selection from the soft control buttons

1. DDA-1 current pulse. For any rms measurement

2. peak current from

For any

can

For

any

current

the

output

current in

current greater

the

than

calculate the true rms value

output

less

is

invalid.

current pulse, Model DDA-1

and

the

calculate

peak

an

current.

anticipated rms value

following ways via

on

the

half a cycle, Model

of

the

than

half a cycle, a true

can

This multiple-current calculation feature is also useful

to

when

testing different styles

of

solid-state trip devices. This feature allows the test set to simulate a similar type current calculation that is being

used

by

the

state trip devices.

Digital

technology, Model DDA-1's system current is This provides high-accuracy timing instantaneous trip function addition, in

timer: Thanks to digital signal processing

knows

present

and

when

the

breaker

even

on

fast-acting breakers.

the

cycles

digital timer

or

seconds.

can

display

the

exactly

under

when

breaker

A completely digital, solid-state circuit starts automatically stops it will accommodate a variety

when

the

device

output

current starts to flow

under

test operates. This circuit

of

test conditions including:

output

current

test.

the

output

the

current

and

delivering a

panel:

output

measure

th~

of

various solid-

when

test opens.

testing the

In

trip time

the

timer

and

the

I 1

I i

Megger"

The

DDA

Series

offers

capacity

in a single,

compad

enclosure

easily

maneuvered.

.1.

When

testing a circuit breaker

or

a device

auxiliary contact to monitor (e.g., a single-pole circuit

the

breaker), flow

and

2.

When contacts, flow

and

3.

When contacts,

flow

and

Digital the

input

the

test set.

timer starts

stops

when

testing a device the

timer starts

stops

when

testing a device the

timer starts

stops

when

voltmeter:

voltage

It

to

also evaluate contact condition across

breaker

contacts while subject

when

the

output

and

monitoring normally closed

when

the

contacts

and

monitoring normally

when

the

contacts close.

Model DDA-l

the

test set

can

be

used

by

measuring the voltage

the

output

current is interrupted.

the

output

open.

the

output

can

be

used

or

the

output

as a diagnostic tool

to

high current.

Panel indicators: Panel lamps incorporated for safety

and

convenience, indicate:

1.

Output

2.

Thermal

3.

GROUND INTERLOCK

4.

OVER

External initiate circuit: Allows initiation from a

of

WARNING

RANGE

remote

the

set ENERGIZED

or

of

ammeter

location

SHUIDOWN

open

when

desired.

of

SPECIFICATIONS

Input

Because Model DDA-3000/-6000 is low-voltage circuit breakers, there are a designed frequencies. When system available. DDA-3000

Output

Output zero

the

accommodate For

to

contend

ordering, select

and

Circuit:

to

the

maximum

device

under

a variety

high

impedance

with

the

test set which best suits

The

standard input

DDA-6000 series are as follows:

The

output

current available through

test.

Two

of

load

devices,

used

all over

number

many

different input voltages

power

requirements for

of

the

test set is easily adjustable from

output

ranges are provided

circuit impedances.

the

output

can

be

high

relatively

that

can

which

current starts

to

measure

voltage from

operator

the test

the

world

of

test sets

the

power

the

impedance

to

connected

be

has

open

to

drop

set

to

and

in

to

test

the

Maximum

Continuous

Current

4500 4446

4446

DOA6000.

no

:ODA-.600:?

6250 6175 A

6175A

to

··;M~d~

PR);;-'3QOOS¢t!¢S1000 454

DDA~600(rs~i,~f

series (with the series at a The maximum current available from primarily The duration thermal conditions within Output output Megger stab CBS-2 eliminate the significant losses that connect used will

Duty

indicated for 30 minutes, followed

Maximum

produce

Instrumentation Digital

Operating

Memory Continuous

Digital

Ranges:

Overall

Continuous ±1% Peak Pulse RMS

Digital

Ranges

0.0001

Accuracy:

Digital Operating

Input Output voltage External voltage

of

Digital

Ranges: 0 to

Accuracy:

'.-

" .

,,~~

reduced

when

not

Cycle:

Pulse ±1.5%

voltage

.

for

..

~:2··I-W_E_IG,-H_T-+-

'~'''

..•. ',.,

Ib

.'.

-;

Connections:

available from

the

connect directly

the

Ammeter

Display:

Timer

Display:

to to

Voltmeter

Display:

1200 545 46 X 55 X 28 in. 117 X 140 X

.yo:.:.:':

,,:-,-,.

maximum current.

by

the impedance

of

the available current is determined primarily

adapter

board

use

with drawout style, metal-clad breakers. The stabs

breaker

under

testing molded-case

The

test

Output

Current:

following outputs

Mode

5-digit display

200/2000/20,000/200,000 A

Ammeter

of

reading

±2%

of

reading

of

reading

5-digit display

99999 seconds 99999 cycles

± 1 %

of

reading

Mode

5-digit display

600 V

±

1%

of

reading

DDA-3000

Universal

A A

kg

bar

provided)

the

To provide

the

test set,

to

set

will

System

Circuit

Output

Maximum

Through

Circuit

Breaker

35,000

2S,OOOA

60,000

50,000

____

H X W X D

46X46X28in.

to

of

the

load

test set.

maximum

each

and

stab

sets Model

occur

test to

the

breakers

the

stabs.

supply

by

Model DDA-3000/-6000 Series will

at

rated

with

0.281 in.

Accuracy

with

0.281 in.

with

0.281 in. (7

and

Breaker

Current

a

A

D_I_M_E_NTS_I_O_N_S

(in.)

double

the

test

circuit.

utilization

set

is

equipped

if leads are

test set. Cables must

or

other

the

rated continuous current

30 minutes off.

input

voltage:

DDA-6000

Test

Maximum Current

Through a Short

Circuit

60,000 A 48,000

48,000

100,000 A

SO,OOOA SO,OOOA

___

H X W X D

117X117X71em

the

output

voltage

set

is determined

of

the

with a

CBS-1

and

Model

used

to

be

devices which

C7

mm) numerals

C7

mm) numerals

mm)

numerals

Sets

A

--I

(em)

71

em

by

Megger"

DDA-3000

and

DDA-6000

Universal Circuit Breaker

Test

Sets

OPTIONAL

Protective

A

tough nylon other It conforms to

and

oil exposure

to

(-40 with

fungal

Input

If

the

or

if

use

of

input

ACCESSORIES

Cover

cover

made

of

is available for protecting the test

particulate matter during storage.

Mil-C-43006D

hydrocarbon resistance.

to

temperatures ranging from -40

+820

C),

and

Autotransformer

nominal input voltage for the test set is

at

different locations requires the

voltages,

heavyweight, reinforced, vinyl-coated

and

the fire-retardant material is treated

ultraviolet ray inhibitors.

an

autotransformer may

ORDERING

Item

(Qty)

Model

DDA-3000 DDA-3000

Model

DDA-3001 DDA-3001

Model

DDA-3002 DDA-3002

Model

DDA-6000 DDA-6000

Model

DDA-6001 DDA-6001

Model

DDA-6002 DDA-6002

Included Accessories

Standard stab sets

Leads

Timer

leads, 12

Input

leads,

Fuses

Fuse

500

Fuse

250 Stab series Instruction manual [1]

Optional Input

autotransformer Leads included Interconnect Jumper Protective cover Model

15-ft

V,

6 A [2]

V,

1.5 A [5]

bar

Accessories

leads,

lead [1]

CBS-3

stabs

ft

(3.7 m) [2] 2997

(4.5-m), 4/0 cable [2] 17163

[1]

with

input

autotransformer

10-ft

(3-m), 4/0 cable [2]

set

from oil,

dust

passes Mil-C-20696B test for

It

will withstand continuous

to

+ 1800 F

not

available,

use

of

a variety

be

used.

INFORMATION

Cat.

CBS-1

and

AT-1,

Contact Technical

or

No.

CBS-2

9377

950

5532

17176

AT-4

17164 17527

PC-1

Sales

The multitapped autotransformer is switch, appropriate sockets, plugs, interconnect cables.

It

is

housed

in a rugged sheet-metal enclosure with casters

and

handles.

All

voltages are single-phase with a tolerance

of

240 volts maximum output and

::.+'~fl;~.!.;'"

PQ~~3,~9(t~~fjeS.1000

D().I(6aOQS~ri~S

and

below

are

of

the test set.

output voltages, contact Megger.

7.,EIG::

454

1200 545

equipped

not

recommended

For

H X W X

46 X 46 X 28 46

X 55 X 28

with a

power

on/off

and

tap selector

of

±5%.

Input taps

for obtaining

other

combinations

:~:~NS~O:~

in.

117 X 117 X

in.

117 X 140 X

of

X D

(em)

71 71

input

em em

UK Archcliffe CT17

9EN T (0) 1 F

(0) 1 304

304

Road, England

502101 207342

Dover

UNITED 4271 Dallas, T 1

800

T 1

214

F 1

214

STATES

Bronze

TX

723 333 331

Way

75237-1019

2861 3201 7399

U5A

OTHER

TECHNICAL SALES OFFICES Norristown Mumbai

Sydney Madrid

The

INDIA,

AUSTRALIA,

5PAIN

Kingdom

U5A,

and

of

Paris

BAHRAIN.

Toronto

FRANCE,

CANADA,

ISO STATEMENT

Registered

to

ISO

9001:1994 Reg no. Q 09250

Registered

to

ISO

14001

Reg

no.

DDA3000_6000_DS_en_ V11 www.megger.com Megger

is a registered

trademark

EMS

61597

B.

SPECIFICATIONS

DDA-3000/3001/3002 and 6000/6001/6002 Specifications

Input

Input Input Input

Voltage

Frequency Current

(Single-

phase)

Output

460V±5% 380V±5% 415V±5% 460V±5% 380V±5% 415V±5%

Maximum Maximum Current

Continuous Through a

60 Hz 50 Hz 200 A 50 Hz 60 Hz

50 Hz 50

Current

4500 A

Hz

200A

200 A 350 A

350A 350 A

Output Current

Circuit Breaker

35,000 A

Maximum Current

Through a

Short

Circuit

60,000 A

I'

\

f

~

!

I

4446 A 4446 A

28,000 A 28,000 A

6250 A 60,000 A 6175A

6175A

50,000 A 50,000 A

2

48,000 A 48,000 A

100,000 A

80,000 A 80,000 A

Instrumentation

Digital

Ammeter Operating Mode

Memory Continuous

Digital Display

5 - digit display with 0.281

Ranges

200/2,000/20,000/200,000

Accuracy

Continuous - ± 1 % Pulse (Peak) - ± 1.5%

Pulse (RMS) - ± 2%

Digital Timer

Digital Display

5 - digit display with 0.281

Ranges

0.0001 to 99999 s

0.0001 to 99999 cycles

Accuracy

± 1 %

in

(7

mm) numerals

A

of

Reading

of

Reading

of

Reading

in

(7

mm) numerals

of

Reading for times that are 2 cycles and longer

Digital Voltmeter

Operating Mode

Input Voltage Output Voltage External Voltage

Digital Display

5 - digit display with 0.281

Ranges

600 V

Accuracy

± 1 %

of

Reading

Dimensions and Weight

ModelNo.

Weight Dimensions

Ib kg H x W x D (in.)

DDA-3000 1000 DDA-6000

1200

454 46 x 46 x 28 in. 545

---

-

in

(7 mm) numerals

46 x 55 x 28 in.

--~

-

xWx

H

117 x 117 x

------

-

117 x

D (em.)

140 x

71 71

cm. cm.

3

SECTION II

1.

DESCRIPTION

A.

GENERAL DESCRIPTION

of

CONTROLS and INSTRUMENTATION

AVO International

Circuit Breaker Test Sets are portable high current units designed

for testing and adjusting low voltage circuit breakers and other current actuated

ac

devices. The units incorporate a variable high current

in

Digital Signal Processing (DSP) technology

well as measure the reactions

as

of

the breaker under test. The units are self

to

control the circuit breaker test sets

output, and uses the latest

protected against overloads and short circuits.

B.

CONTROLS AND INSTRUMENTATION

1) OUTPUT CONTROLS:

a) OUTPUT SELECTOR

Switch:

Adjustment the combination Switch

This is a multi-position switch which provides coarse adjustment

of

the output is accomplished by

of

the OUTPUT SELECTOR

and VERNIER CONTROL.

of

the output. Position 1 provides minimum output. The last position provides maximum output. The SELECTOR Switch

is interlocked with the

OUTPUT

output initiating circuit. Depressing the switch

to change positions operates the interlock and

de-energizes the output.

I .

I

b)

VERNIER

(Power

2. Circuit Breaker:

3.

FUSE:

4. AUX.

OUTLET

CONTROL Provides fine adjustment

Stat): between steps

of

the OUTPUT SELECTOR

Switch.

Functions Switch

as

the input

and also provides short-circuit and

overload protection.

Protects control and isolation transformers

A ground fault protected

for

provided

convenient connection

accessory equipment.

of

the output

POWER

ON/OFF

120-volt outlet is

of

4

5.

Input Receptacles

6.

Equipment Ground

7.

Isolation Ground

Receptacles for input power connection

Test set chassis ground. For safety purposes, this should be connected to a power system ground.

is

part

of

an

This ground connection circuit that verifies that the test set chassis

interlock

is

connected to a separate earth ground.

5

4. DDA CONTROL PANEL

o

TEST

1.

START

Button

- Energizes the output

i

I

2.

STOP

3.

EXT. START

(blue) to provide remote initiation

TEST FUNCTION

4. TIMER STOP MODE - Three modes and timer operation.

C.A. (Current Actuate) - When the device those involved position, the timer will run from the initiation interrupted. This position is the position most commonly used for controlling timer operations (Default setting). The output will de-energize when the current level drops below 8%

N.O. (Normally Open) - When it is desired to control the timer from a set open contacts (such as an auxiliary contact) this type this position, the timer will run from the initiation contacts connected to the

Button

- De-energizes the output.

Terminals

in

the passing

of

range.

- An external switch can be plugged into these terminals of

the test set.

of

test current, this type

TIMER STOP (Yellow) terminals.

operation are available to control the output

to

be tested has no contacts other than

of

operation is used. In this

of

the test until the test circuit is

of

operation may be used.

of

the test until the opening

normally

In

of

the

I

, !

N.C. (Normally Closed) - When it is desired to control the timer from a set normally closed contacts (such as a multi-pole circuit breaker), this type may be used. opening

5.

TIMER STOP

contacts on the device under test to monitor contact opening and closure. The timer

of

In this position, the

the contact connected to the TIMER STOP (Yellow) terminals.

Terminals

of

operation

tim~r

- These terminals (yellow) facilitate connection to a set

will

6

run

from the initiation

of

the test until the

of

stops and output is de-energized when the device operates (used with the

6.

TIME UNITS Selection- Selects the mode

7.

OUTPUT Mode - The following two selections are available

TIMER STOP MODES

PULSE - When selected, the output period (default is 5 cycles) and then

of

N.O. and N.C).

of

the test set is on for a short, specified time

is

turned off. (Should the device under test

count; either cycles

in

conjunction

or

seconds.

operate after pushing the START Button, the output will be de-energized). This position is

normally used when setting the test current prior to the timing test and providing short high current pulses for instantaneous tests. However, the duration this output pulse can be programmed via the Display Menu. (See the Section III, Front Panel Display and Programming Menus.) (Default Setting).

MAl NT. - When selected, and the START Button is pressed, the control circuit

of

maintains the output

the test set until the device under test operates or the STOP

Button is pressed. This is the normal position for Time Delay tests.

VOLTS (voltmeter selection) Switches

of

E.

8.

VOLTS - three different selections are available for display

IN

- When this voltage display selection is made, the voltage at the input plugs

test set will be displayed (Default Setting). OUT - When this voltage display selection is made, the voltage at the output

of

terminals

the test set will be displayed.

EXT. - When this voltage display selection is made, the voltage applied to the EXT. VOLTS terminals will be displayed.

9.

EXT. VOLTS terminals - These two terminals enable the digital voltmeter to

measure external a.c. voltages up to

AMMETER

10. AMMETER RANGE Switches - Selects the desired full scale range

600 Volts.

of

the meter.

NOTE: The output current level from the test set must be at least 8 percent any full scale value before the ammeter will indicate an output reading. Please be

aware that changing ammeter ranges while the output is energized may in erroneous ammeter readings. The 4 range selections are

0.2kA1

2kA1

and 200 kA range. Default Setting is the 200 kA range.

of

the

result

20kA I

of

11.AMMETER MODE

MEM/CONT - Selects the mode highest measured current is indicated on the ammeter.

of

the ammeter circuit. In the MEM position, the

The

CONT mode permits

7

the ammeter to continually indicate the value and MAl NT. Modes

current value will be displayed. Default

of

operation, it will require 30 cycles

Setting is MEM.

of

output current. When

of

output current before a

in

the CONT.

SERIPAR switch must be in the amount

When

operating the unit with the output in a series configuration, this

SERIES position in order for the ammeter to read the correct

of

output current. (See Section IV, 2, A for more details.) The default setting

is PARALLEL.

FRONT PANEL DISPLAY AND INDICATORS

12.

LCD Display Panel - This panel displays Output Amperage, Vac, and Time. It is

of

also used to program many other features

Front Panel Display and Programming Menus

III,

13.Front Panel Over

Range - Illuminates to indicate that output current has exceeded the

Indicators

the DDA control panel (See Section

for

more details).

AMMETER RANGE selected. Output Energized - Illuminates to indicate that the SCR has gated and the output is

energized. Interlock GND Open - A special ground interlock circuit is incorporated which verifies

of

that the test set chassis is connected to system ground before the output set can be energized.

If

not properly grounded, this indicator will illuminate and

the test

prevent the test set from energizing.

I"

[

I I

.,

Thermal Warning -

Indicates that the thermal status

of

the test set is approaching an

over temperature condition. Thermal Shutdown -

Indicates that the thermal status

of

the test set has reached an over temperature condition. The test set will not operate as long as there is an over temperature condition.

14.Softkeys - Used to set programmable functions indicated on the

LCD display panel:

8

SECTION III

1. FRONT PANEL DISPLAY AND PROGRAMMING MENUS

9

Megger DDA-1, DDA-3000, DDA-6001, DDA-6002, DDA-3001 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual