Compliance West GF-25A Service manual

GF-25A

Ground Circuit Tester

Instruction Manual

COMPLIANCE

WESTUSA

Dear Customer:

Congratulations! Compliance West USA is proud to present you with your Ground
Fault Circuit Tester. Your instrument features a groundbreaking circuit design and
ergonomic front panel and represents the latest in high current production line testing.

To fully appreciate all the features of your new meter, we suggest that you take a few
moments to review this manual. Compliance West USA stands by your instrument
with a full one-year warranty and a loaner instrument policy. If the need arises, please
don't hesitate to call on us.

Thank you for your trust and confidence.

Rev. 1.20 Dec. 7, 1993

Table of Contents

Introduction and Specifications................................................................................................................................1

Introduction.................................................................................................................................................1

Specifications...............................................................................................................................................1

Operation ......................................................................................................................................................................3

Setting up your tester.................................................................................................................................3

AC Line Voltage Requirements.................................................................................................................3

Fuse Replacement.......................................................................................................................................3

Front Panel Features...................................................................................................................................3

Initial Checkout Procedure.........................................................................................................................5

Adjusting the Pass/Fail Point....................................................................................................................5

Adjusting the Pass/Fail Point using the supplied Test Cordset..........................................5

Adjusting the Pass/Fail Point for products with non-removable power cords................6

Time Duration Adjustment........................................................................................................................6

Operating Techniques................................................................................................................................8

Setting the Test Time Duration.................................................................................8

Testing the EUT..........................................................................................................................8

Test results...................................................................................................................................8

Green Light...................................................................................................................8

Red Light......................................................................................................................8

Red Light and Buzzer Sound.....................................................................................8

Simultaneous Red and Green Light..........................................................................9

Green Light and Buzzer Sound..................................................................................9

Troubleshooting Guide..............................................................................................................................10

Technical Assistance.................................................................................................................................10

Maintenance................................................................................................................................................................11

Introduction.................................................................................................................................................11

Service Information.....................................................................................................................................11

General Maintenance..................................................................................................................................11

Interior Access............................................................................................................................11

Calibration Access......................................................................................................11

Main PWB Removal ....................................................................................................12

Front Panel Removal...................................................................................................12

Cleaning........................................................................................................................................12

Performance Test .........................................................................................................................................12

Operation/Lamp Function Test.................................................................................................13

Current Output Test ....................................................................................................................13

Calibration Procedure .................................................................................................................................13

Power Supply Check...................................................................................................................14

Voltage Range Adjustment........................................................................................................14

Current Calibration Adjustment................................................................................................14

Introduction and Specifications

Introduction

This manual contains complete operating,
maintenance and calibration instructions for the
Compliance West USA Model GF-25A Ground
Circuit Tester.

The instrument is a bench-type ground circuit
tester.

The GF-25A features automatic one button
operation, with PASS or FAIL test result
indicated by lights on the front panel and an
internal buzzer. A supervisor-adjustable test
duration circuit allows the test to continue for a
predetermined amount of time after the Test
Button has been released. The instrument
advises the operator of any internal malfunction
affecting the output. A one-time setup procedure
allows the instrument to compensate for lead
resistance, allowing the instrument to measure
the true resistance of the grounding circuit of the
equipment under test.

The GF-25A meets TÜV criteria for automatic
production line ground circuit testers.

Your tester is warranted for a period of one year
upon shipment of the instrument to the original
purchaser.

Section 1

Specifications

Specifications for the Testers are listed in Table
1-1.

ELECTRICAL
Output 25 Amps dc ± 3% into any load - short circuit to 100

milliohms
Pass/Fail Criterion 100 - 200 milliohms user adjustable. 100 milliohm
calibration resistor supplied. See Table 1-2.
Pass/Fail Repeatability ± 3%
Ramp Time 10 msec
Overshoot none
Test Duration Timer 0-10 sec. approx.
Duty cycle 100 %

ENVIRONMENTAL
Operating Temperature 15-40°C

Relative Humidity Range 0-90% non-condensing

GENERAL

Input power requirements 90-127 or 180-254 volts, 50/60 Hz

Weight 12 lbs

Table 1-1. GF-25A Specifications

Non-Detachable Cordset AWG Non-Detachable Cordset Maximum Length*

18 6 feet
16 10 feet
14 14 feet
12 20 feet

Table 1-2. GF-25A Non-Detachable Cordset Maximum Length.
*Custom configurations available for longer non-detachable cords. Contact factory.

2

Operation

This section describes how to set up and make
measurements with your tester. We recommend
that you read the entire section carefully so that
you can use all of the features of your Tester.

Setting up your tester

Your tester is shipped in a special protective
container that should prevent damage to the
instrument during shipping. Check the shipping
order against the contents of the container and
report any damage or short shipment to
Compliance West USA. The container should
include the following:

• The GF-25A Tester

• A 12 AWG Test Return Lead

• An 18 AWG Line Power Cord

• A 14 AWG Test Power Cord

• A plastic calibration screwdriver

• An alligator clip/wire assembly

• This Instruction Manual

If reshipment of the instrument is necessary,
please use the original shipping container. If the
original shipping container is not available, be
sure that adequate protection is provided to
prevent damage during shipment. We
recommend that the instrument be surrounded by
at least one inch of shock-absorbing material on
all sides of the container.
Remove the Tester from its container and place it
on a test bench.

Section 2

AC Line Voltage Requirements

AC line voltage requirements for your Tester are
noted on the rear panel of the instrument. Do not
connect the instrument to a different voltage
source.

Fuse Replacement

There is a user-replaceable fuse (F1) located on
the rear panel of the instrument. It is located
behind a door in the Power Inlet-Power Switch­Fuseholder device. The fuse rating is noted on
the rear panel. Do not attempt to replace it with a
fuse of any other rating.

Use the following procedure to replace the fuse
F1:

1. Turn the power switch to the O or off
position.

2. Unplug the instrument from the source of
supply.

3. Remove the power inlet cord from the
instrument.

4. Using a small screwdriver, pry open the
fuseholder door.

5. Replace the fuse with a new one of the
correct rating.

6. Replace the fuseholder door and power inlet
cord.

Front Panel Features

Before using your Tester, take a few minutes to
become familiar with the use of its controls,
indicators and connectors. The front panel
features of the GF -25A are shown in Figure 2-1
and described in Table 2-1. The rear panel

3