METREL A 1322 User manual

3P-Active GT / Machine
A 1322
3P-Active GT / Machine Plus
A 1422
Instruction manual
Version 2.1.6, Code no. 20 751 979
Autorisierter Distributor

2
Distributor:
Manufacturer:
METREL d.d.
Ljubljanska cesta 77
1354 Horjul
Slovenia
web site: http://www.metrel.si
e-mail: [email protected]
Mark on your equipment certifies that it meets requirements of all subjected EU regulations
Hereby, Metrel d.d. declares that the A 1322 and A 1422 are in compliance with
subjectedEUdirectives.The fulltext ofthe EUdeclarationof conformityis available
at the following internet address https://www.metrel.si/DoC.
© 2021 METREL
No part of this publication may be reproduced or utilized in any form or by any means
without permission in writing from METREL.
DistributorAutorisierter

A 1322 / A 1422 Table of contents
3
Table of contents
1Preface.................................................................................................................5
2Safety and operational considerations .............................................................6
2.1 Warnings and notes...........................................................................................6
2.2 Standards applied .............................................................................................7
3Description ..........................................................................................................8
4Operation...........................................................................................................10
4.1 Connections ....................................................................................................10
4.2 Power supply considerations...........................................................................11
4.3 Working with the adapter.................................................................................12
4.4 Instrument data of the adapter ........................................................................13
4.5 Status indicators and Messages......................................................................13
5Measurements...................................................................................................15
5.1 Continuity - Earth bond resistance measurement............................................15
5.1.1 Compensation of test leads resistance.....................................................16
5.2 Insulation resistance (Riso, Riso-S) and Substitute leakage current (Isub, Isub-
S) measurements............................................................................................16
5.3 Differential leakage current measurement.......................................................17
5.4 Touch leakage current measurement..............................................................18
5.5 Polarity / Active Polarity test............................................................................19
5.6 3-phase PRCD test .........................................................................................20
5.7 Power..............................................................................................................21
6Measurements with A 1422 (according to IEC / EN 60974-4).........................23
6.1 Insulation resistance (supply circuit to protective circuit).................................23
6.2 Insulation resistance (welding circuit to protective circuit)...............................24
6.3 Insulation resistance (supply circuit to welding circuit) ....................................25
6.4 Insulation resistance (supply circuit of Class II equipment to accessible
surfaces)..........................................................................................................26
6.5 Welding circuit leakage current .......................................................................27
6.6 Primary leakage current ..................................................................................28
6.7 No-load voltage ...............................................................................................29
7Maintenance ......................................................................................................30
7.1 Cleaning..........................................................................................................30
7.2 Service ............................................................................................................30
8Technical specifications...................................................................................31
8.1 Test functions..................................................................................................31
8.1.1 Continuity.................................................................................................31
8.1.2 Insulation resistance (including S-probe) .................................................31
8.1.3 Substitute leakage current (including S-probe) ........................................31
8.1.4 Differential leakage current ......................................................................31
8.1.5 Touch leakage current..............................................................................32
8.1.6 Polarity / active polarity ............................................................................32
8.1.7 3-phase portable RCD..............................................................................33

A 1322 / A 1422 Table of contents
4
8.1.8 Power.......................................................................................................33
8.1.9 Insulation resistance LN-PE (supply circuit to protective circuit) (according
to IEC/ EN 60974-4).................................................................................34
8.1.10 Insulation resistance W-PE (welding circuit to protective circuit)
(according to IEC/ EN 60974-4)...............................................................34
8.1.11 Insulation resistance LN-W (supply circuit to welding circuit) (according to
IEC/EN 60974-4)......................................................................................35
8.1.12 Insulation resistance LN-P (supply circuit of class II equipment to
accessible surfaces) (according to IEC/ EN 60974-4)..............................35
8.1.13 Welding circuit leakage current Iw (according to IEC/ EN 60974-4).........36
8.1.14 Primary leakage current I diff (according to IEC/ EN 60974-4).................36
8.1.15 No load voltage (according to IEC/ EN 60974-4) .....................................37
8.2 General data....................................................................................................38

A 1322 / A 1422 Preface
5
1 Preface
Congratulations for purchasing and using METREL 3P-Active GT / Machine (Plus)
adapter accessory with METREL test and measuring instruments.
The A 1322 / A 1422 enables testing of different types of three-phase electrical
equipment.
Features:
All tests on 3-phase electrical equipment can be carried, including live leakage
tests, power, portable RCD testing and polarity + active polarity test,
Simple connection to the PAT tester,
Simple test procedures, same as for single phase equipment,
Adapter is compatible with most of METREL PATs and machine testers,
A 1322 can be supplied from both 1-phase or 3-phase earthed power supply
systems.
In addition, A 1422 enables testing of electrical safety of welding machines according to
IEC / EN 60974-4:
All appropriate tests (continuity of protective circuit, insulation tests, leakage and
touch leakage tests, no-load voltage test) on 1 and 3-phase welding machines
can be carried out.
Highlights:
Support for new types of PRCDs and PRCD protected equipment.
The accessory is automatically detected by the PAT tester. The test sequence for
3 phase equipment is automatically set on base of entered test code and input
mains voltage.
A 1322 and A 1422 are three-phase accessories intended for using only with METREL
appliance testers.

A 1322 / A 1422 Safety and operational considerations
6
2 Safety and operational considerations
2.1 Warnings and notes
In order to reach high level of operator’s safety while carrying out various tests and
measurements as well as to keep the test accessory and equipment undamaged, it is
necessary to consider the following general warnings:
❑Warning means »Read the Instruction manual with special care to safety
operation«. The symbol requires an action!
❑If the A 1322 / A 1422 is used in a manner not specified in this Instruction
manual or the manual of target test equipment, the protection provided by the
A 1322 / A 1422 and equipment may be impaired!
❑Read this Instruction manual carefully, otherwise use of the A 1322 / A 1422
may be dangerous for the operator, for test equipment or for the tested object!
❑Do not use the A 1322 / A 1422 if any damage is noticed!
❑Consider all generally known precautions in order to avoid risk of electric
shock while dealing with hazardous voltages!
❑Tested appliance must be disconnected from any supply system and
discharged!
❑Service intervention is allowed tobe carried outonly by a competentauthorized
person!
❑Do not touch free male connectors during the (active) polarity test.
❑Use only earthed 1- phase or 3- phase mains supply system to power A
1322 / A 1422 adapter! PE must have low impedance to earth, recommended
is < 0.3 .
❑Pay attention that tested appliance can be normally activated when it is
connected to test socket of A 1322 / A 1422.
❑Do not connect 3-phase appliances to the A 1322 / A 1422 test sockets in case
the A 1322 / A 1422 is single phase supplied, this could lead to abnormal
operation and/or damages of the 3-phase tested appliance.
❑Do not connect mains voltage on EB, W1 and W2 terminals.

A 1322 / A 1422 Safety and operational considerations
7
2.2 Standards applied
The instrument is manufactured and tested according to the following regulations, listed
below.
Electromagnetic compatibility (EMC)
EN 61326 -1
Electrical equipment for measurement, control and laboratory use
- EMC requirements - Part 1: General requirements
Safety (LVD)
EN 61010 -1
Safety requirements for electrical equipment for measurement,
control, and laboratory use –Part 1: General requirements
EN 61010 -2 -030
Safety requirements for electrical equipment for measurement,
control and laboratory use –Part 2-030: Particular requirements
for testing and measuring circuits
Application
A 1322 and A 1422
VDE 0701 - 0702
Prüfung nach Instandsetzung, Änderung elektrischer Geräte
–Wiederholungsprüfung elektrischer Geräte - Allgemeine
Anforderungen für die elektrische Sicherheit
IEE Code of Practice
Code of Practice for In-service Inspection and Testing of
Electrical Equipment
EN 50699
Recurrent Test of Electrical Equipment
EN 50678
General procedure for verifying the effectiveness of the
protective measures of electrical equipment after repair
A 1422
IEC/EN 60974 - 4
VDE 0544 - 4
Arc welding equipment - Part 4: Periodic inspection and
testing
Note about EN and IEC standards:
Text of this manual contains references to European standards. All standards of EN
6xxxx (e.g. EN 61010) series are equivalent to IEC standards with the same number
(e.g. IEC 61010) and differ only in amended parts required by European harmonization
procedure.

A 1322 / A 1422 Description
8
3 Description
Figure 3.1: A 1322 front panel
Figure 3.2: A 1422 front panel

A 1322 / A 1422 Description
9
Legend:
1
Plastic case.
2
Circuit breaker.
3
Contactor for enabling testing with mains supply (functional, power, leakage,
PRCD).
4
Status indicators, (OK, 1P, 3P, N) see chapter 4.5 Status indicators and
Messages.
5
PAT test socket. (For connection to appliance tester test socket.)
Never connect it to mains supply socket!
6
EB connection to the master instrument. See chapter 4.1 Connections for more
information.
7
RS 232 connector for communication with master instrument.
8
Power supply plug connector, for power supply options see chapter 4.2 Power
supply considerations.
Never operate the A 1322 / A 1422 at other mains supply as defined in
chapter 4.2 and supply voltages other as defined in chapter 8.2.
9
W1
Test socket for connection of welding output of welding machine
(A 1422 only).
10
W2
Test socket for connection of welding output of welding machine
(A 1422 only).
11
Supply socket for master instrument. The socket is controlled via circuit breaker
(2)
Note: The master instrument can be supplied from the socket of the A 1322 / A
1422 or directly from any other wall socket with proper voltage and grounding.
12
Test sockets
-16: 3-phase 32 A appliance; 17 + 16: 32 A 3-phase cord,
-14: 3-phase 16 A appliance; 15 + 14: 16 A 3-phase cord,
-12: single phase 16 A appliance; 13 + 12: 16 A single phase cord.
Sockets 12, 14, 16 are intended for test purpose only! Never use the A
1322 / A 1422 for power supply distribution!
Do not connect external supply to any of test sockets and/or plugs.
13
14
15
16
17

A 1322 / A 1422 Operation
10
4 Operation
The A 1322 / A 1422 operates in conjunction with the master instrument (PAT or
Machine tester).
Following is the list of applicable testers; in this manual they are referred as a master
instrument:
MI 3360 OmegaGT XA
MI 3325 MultiservicerXD.
Connecting to MI 3360 and MI 3325 is described in their respective manuals.
4.1 Connections
Required and optional connections between A 1322 / A 1422 and the master instrument
are shown in the following figure.
Figure 4.1: Connection of MI 3360
instrument
Figure 4.2: Connection of MI 3325
instrument
Required connections are:
-Measuring connection between PAT test socket (5) on A 1322 / A 1422 and
mains test socket of the master instrument, and
-RS232 communication interface between the A 1322 / A 1422 (7) RS232 port
and 3-phase adapter RS232 connector on the master instrument.
Optional connections:
-when measuring prolongation cords and PRCDs via test sockets 13,15,17 the
EB(6) should be connected to the P/S terminal on the master instrument. The
connection is used for earth bond and polarity tests.
The EB(6) connection is not intended for measuring earth bond of appliances not
connected to sockets 13,15,17, touch current, insulation resistance S, substitute
leakage current S. For this tests the P/S terminal on the master instrument shall
be used (no connection to the EB(6) socket on the A 1322 / A1422).
-The master instrument can be optionally supplied via power supply socket (1). It
is recommended to use this connection, especially if no external 230 V wall

A 1322 / A 1422 Operation
11
socket is available. The voltage on supply socket (11) is turned on/off with the
fuse/circuit breaker (2) on A 1322 / A 1422.
4.2 Power supply considerations
The 3-phase 32 A socket (8) of A 1322 / A 1422 is intended for connection to mains
supply. A 1322 / A 1422 can be connected to single-phase and 3-phase mains supply.
The figure below shows connections of supply cords for both possibilities.
Figure 4.3: Mains supply cable for single-phase supply and 3-phase supply
The A 1322 / A 1422 works in TN/TT supply systems with distributed N and/or NPE and
rated supply voltages UL-N / UL-L230/400 V and/or 120/208 V.
Operation on 3-phase system without N conductor
The A 1322 / A 1422 can also be supplied in 3-phase 4W system (without N conductor).
In this case the master instrument cannot be supplied from the A 1322 / A 1422 and
shall be connected to an external 1-phase wall socket.
Some tests cannot be performed successfully:
Active tests/measurements (differential and touch leakages, active polarity,
PRCD testing and functional test) on 16 A (3 pole: L+N+PE) test socket.
Active polarity test on 5 pole (L1+L2+L3+N+PE) 16 A and 32 A test sockets.
PRCD testing on all test sockets.

A 1322 / A 1422 Operation
12
4.3 Working with the adapter
Master instrument automatically recognize properly connected 3P- Active GT / Machine
(Plus) adapter A 1322 / A 1422.
To establish connection, following procedure shall be applied:
Item
Comment
Connect A 1322 / A 1422 and the
master instrument via RS232 interface.
See chapter 4.1 Connections
Connect the master instrument test
socket and the A 1322 / A 1422 PAT test
socket.
See chapter 4.1 Connections
Connect the master instrument mains
cord to the output power supply socket
on A 1322 / A 1422.
See chapter 4.1 Connections
Connect A 1322 / A 1422 to mains
supply.
Turn on fuse/circuit breaker on A 1322 /
A 1422.
The adapter beeps.
Turn on the master instrument.
Select the test function.
See Instruction manual of the master
instrument.
Measuring system is now ready for
testing.
appears on the master
instrument screen for indication of
connected A 1322 / A 1422.
Connect tested equipment to the proper
test socket/plug
See chapters: 5 Measurements / 6
Measurements with A 1422
(according to IEC / EN 60974-4) for
proper connection of appliances /
welding machines to a measuring
system.
Press Start on the master instrument to
start the test sequence.
See Instruction manual of the master
instrument.

A 1322 / A 1422 Operation
13
4.4 Instrument data of the adapter
A 1322 / A 1422 adapter data (serial number, hardware and firmware version, etc.) can
be read on the master instrument screen, if RS-232 data connection is established.
Data is available from General settings / About menu of the master instrument.
Master instrument data appear on the screen first, followed by adapter data. Refer to
master instrument Instruction manual for more information.
Figure 4.4: MI 3360 instrument data
Figure 4.5: A 1322 / A 1422 adapter data
4.5 Status indicators and Messages
Status indicators
Four LEDs on 3P- Active GT / Machine (Plus) adapter A 1322 / A 1422 indicates its
status as described in following table:
LED
indicator
Description
OK
Continuous:
The A 1322 / A 1422 adapter is ready for use.
Blinking:
Hardware error.
1P
Single-phase supply system status
Continuous:
A single-phase supply voltage is applied.
Blinking:
Warning for improper power supply voltage condition:
Possible causes are:
-L and N wire crossed,
-No earth connection or other wiring problem on
supply socket,
-Incorrect mains voltage.
Warning:
The A 1322 / A 1422 must be properly earthed! See 4.2 Power
supply considerations.
3P
3-phase supply system status
Continuous:
A 3-phase supply voltage is applied
Blinking:
Warning for improper power supply voltage condition:
Possible causes are:
-No earth connection or other wiring problem on
supply socket,
-L and N wire crossed when instrument is
connected to 1-phase supply system,
-Incorrect mains voltage.

A 1322 / A 1422 Operation
14
Blinking at
start-up
3-phase supply voltage is applied. Check phase
rotation.
Warning:
The A1322 / A 1422 must be properly earthed! See 4.2 Power
supply considerations.
N
Power supply Neutral conductor status
Light on:
Power supply system with N conductor.
Light off:
No N conductor in the incoming power supply system.
Messages
When A 1322 / A 1422 adapter is connected to the master instrument and single test
measurement is selected, its status is indicated with coloured icon on the master
instrument screen:
Green icon: A 1322 / A 1422 adapter is ready to perform selected test or
measurement
Grey icon: Communication error or required A 1322 / A 1422 adapter is not
connected
Red icon: Selected test / measurement in not supported with A 1322 / A 1422
adapter
Warning messages
After single measurement test is started, A 1322 / A 1422 adapter checks for proper test
connection with master instrument and safety conditions on test sockets. Test
connection failure or dangerous conditions are reported and presented on the master
instrument screen with the following messages:
DANGER!
Voltage on test socket (16A or 32A) is higher
than approximately 25 V (AC or DC)!
Disconnect the test probe from the DUT and
determine why external voltage was detected!
Master instrument Test socket and PAT test
socket of the A 1322 / A 1422 are not connected
properly.
Check the test connection.
Refer to master instrument Instruction manual for more details on symbols and
messages appearing on master instrument screen, when test or measurement is
selected and executed.

A 1322 / A 1422 Measurements
15
5 Measurements
5.1 Continuity - Earth bond resistance measurement
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapter Continuity for detailed information.
Procedure:
Item
Comment
Prepare test system.
See chapter 4.3 Working with the
adapter.
Compensate test leads resistance (if
necessary).
See chapter 5.1.1 Compensation
of test leads resistance.
Connect power supply plug of tested
appliance into proper test socket.
Connect P/S probe of the master
instrument to the accessible conductive
part of the CLASS I appliance.
See Figure 5.1.
Prepare and start measurement on the
master instrument.
Wait until measurement is finished or stop
the measurement.
Check result(s).
Store result(s).
Optional
Figure 5.1: Continuity - Earth bond resistance test connection
Note:
Consider displayed warnings before starting measurement!

A 1322 / A 1422 Measurements
16
5.1.1 Compensation of test leads resistance
Test leads compensation enables to eliminate the influence of test leads resistance and
instrument's internal resistance.
Compensation of test leads resistance procedure:
Item
Comment
Prepare test system.
See chapter 4.3 Working with
the adapter.
Connect test lead to P/S terminal on the
master instrument.
See Figure 5.1.
Connect test lead probe to the PE pin of the
test socket (32A 5p, 16A 5p or 16A 3p).
See Figure 5.1.
Select Continuity function from the Single test
menu of the Master instrument.
Select test current (200 mA, 4 A, 10 A or 25 A).
Regarding the type of cord.
Start test leads compensation procedure.
Refer to master instrument
Instruction manual for details.
5.2 Insulation resistance (Riso, Riso-S) and Substitute leakage
current (Isub, Isub-S) measurements
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapters Insulation resistance and Sub-leakage current for
detailed information.
Procedure:
Item
Comment
Prepare test system.
See chapter 4.3 Working
with the adapter.
Connect power supply plug of tested appliance into
proper test socket (Riso, Isub, Class I appliance) or
See Figure 5.2.
Connect power supply plug of tested appliance into
proper test socket.
Connect P/S probe to accessible isolated
conductive part of the appliance. (Riso-S, Isub-S,
Class I or Class II appliance).
See Figure 5.2.
Prepare and start measurement on the master
instrument.
Wait until measurement is finished or stop the
measurement.
Check result(s).
Store result(s).
Optional

A 1322 / A 1422 Measurements
17
Figure 5.2: Insulation resistance and Substitute leakage current test connections
(left figure - Class I appliance, right figure - Class II appliance)
Notes:
Consider any warning on the display before starting the measurement!
When P/S probe is connected during the test, then the current through it is also
considered.
Do not touch or disconnect the DUT during the insulation resistance
measurement or before it is fully discharged!
Substitute leakage current may differ substantially from that of conventional
leakage current test because of the way the test is performed. For example, the
difference in both leakage measurements will be affected by the presence of
neutral to earth noise suppression capacitors.
5.3 Differential leakage current measurement
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapter Differential leakage for detailed information.
Leakage current is measured via power supply cord of tested appliance.
Procedure:
Item
Comment
Prepare test system.
See chapter 4.3 Working
with the adapter.
Connect power supply plug of tested appliance into
proper test socket.
See Figure 5.3.
Start measurement on the master instrument.
Wait until measurement is finished or stop the
measurement.
Check result(s).
Store result(s).
Optional

A 1322 / A 1422 Measurements
18
Figure 5.3: Differential leakage current measurement
Warning:
During the test, DUT is powered as for normal operation. Pay attention on
possible electric shock, and danger of rotating or moving parts!
Note:
Consider any displayed warning before starting measurement!
5.4 Touch leakage current measurement
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapter Touch leakage for detailed information.
Procedure:
Item
Comment
Prepare test system.
See chapter 4.3 Working
with the adapter.
Connect power supply plug of tested appliance into
proper test socket.
Connect probe to accessible isolated conductive
part of the appliance.
See Figure 5.4.
Start measurement on the master instrument.
Wait until measurement is finished or stop the
measurement.
Check result(s).
Store result(s).
Optional

A 1322 / A 1422 Measurements
19
Figure 5.4: Touch leakage measurement
Warning:
During the test, DUT is powered as for normal operation. Pay attention on
possible electric shock, and danger of rotating or moving parts!
Note:
Consider any displayed warning before starting measurement!
5.5 Polarity / Active Polarity test
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapter Polarity test for detailed information.
The Polarity test verifies integrity of extension cords, cable reels with distribution
sockets and similar.
The standard (normal) polarity test is suitable for cords without built-in active protection.
In case that tested item is equipped with active switch (RCD or similar) that requires
voltage for normal operation, the active polarity test shall be applied.
Procedure:
Item
Comment
Prepare test system.
Connect P/S terminal on master instrument to
the EB terminal on the A 1322 / A 1422.
See chapter 4.3 Working with
the adapter.
Connect tested power cord to proper test
sockets.
See Figure 5.5 and Figure 5.6.
Select test mode [normal or active] and other
test parameters on the master instrument.
Regarding the type of cord.
Start measurement on the master instrument.
If Active polarity, turn on switch on protected
cord.
To turn on the active switch.
Wait until measurement is finished.
Check result(s).
Store result(s).
Optional

A 1322 / A 1422 Measurements
20
Figure 5.5: Normal polarity test
Figure 5.6: Active polarity test
Warning:
Do not touch free male connectors during the (active) polarity test.
Note:
Consider any displayed warning before starting measurement!
5.6 3-phase PRCD test
Refer to master instrument Instruction manual, chapter Single test
measurements, subchapter PRCD test for detailed information.
This test verifies that the PRCD protection works properly.
Procedure:
Item
Comment
Prepare test system.
Connect P/S terminal on master instrument to
the EB terminal on the A 1322 / A 1422.
See chapter 4.3 Working with
the adapter.
Connect tested PRCD to proper test sockets.
See Figure 5.7.
Start measurement on the master instrument.
Turn on PRCD.
Wait until measurement is finished.
Check result(s).
Store result(s).
Optional