Megger DLRO 600 Bruksanvisning
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M
DLRO
®
600
High Current, Low Resistance Ohmmeter
USER MANUAL
GSAFETY WARNINGS
THESE SAFETY WARNINGS MUST BE READ AND UNDERSTOOD BEFORE THE INSTRUMENT IS USED.
n In some regions the DLRO600 is supplied without a plug terminating the supply lead. In this case an appropriate plug must be fitted prior to use. The instrument can draw 25
amps when running at full current output so please ensure an appropriate plug is used.
n The DLRO600 must be grounded (earthed) when in use.
n If the DLRO600 has been supplied with a 32 A rated three phase plug fitted, the wiring connections have been made with blue to N, brown to L1 and the green/yellow to
g.
The instruments need a ground connection for two reasons.
As a safety ground.
To provide the internal voltmeter with a ground reference, so that it can alert the user if a dangerous voltage is connected to the terminals.
At switch on, an internal test circuit checks that the ground wire is connected. A single-phase supply normally has one live wire one neutral wire and a ground. The neutral is
connected to ground at some point, so that neutral and ground are both at approximately the same voltage. At switch-on there is a continuity check from ground to neutral.
(There is also a check from ground to live in case the power leads are reversed). If there is no continuity the instrument will refuse to start and the screen will remain blank.
This system works well when power is taken from a supply where there is one live phase wire and a neutral which is at ground potential. A problem arises when power is
obtained from a portable generator where the two supply wires are floating. Connecting the DLRO ground to real ground makes it safe but the internal test circuit does not
work because there is no connection between ground and the power wires.
The solution to the problem:
Connect the ground terminal to real ground (for safety).
Connect one of the power wires to ground (to enable the ground test circuit).
It is a good idea to also connect the generator chassis to ground (for safety).
n Circuits must be de-energised before testing.
The DLRO600 must only be used on dead systems. If the item under test has a voltage upon it greater than 10 volts ac peak or dc with reference to ground the DLRO600 will
indicate the presence of the voltage and prevent any tests being carried out.
n Testing inductive circuits can be hazardous:
The DLRO600 is a high power instrument, with an output power measured in kilowatts, designed for testing resistive loads. It must NOT be used to test inductive loads.
n During use the DLRO600, its current leads and the sample being tested can become hot.
This is normal and is caused by the passage of high currents. Take care when touching the instrument, current leads, clips and the test sample.
n This product is not intrinsically safe. Do not use in an explosive atmosphere.
n Ensure that the power switch is always accessible so that power can be disconnected in an emergency.
n If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.
2
CAT II
Measurement category II: Equipment
connected between the electrical outlets and the user’s
equipment.
CAT III
Measurement category III: Equipment connected be-
tween the distribution panel and the electrical outlets.
CAT IV
Measurement category IV: Equipment connected
between the origin of the low-voltage mains supply and
the distribution panel.
SYMBOLS USED IN THIS DOCUMENT AND ON THE INSTRUMENT
u Protective conductor terminal
s Hot terminals
G Refer to the User Manual for more information
1 Power On
0 Power Off
c Equipment complies with relevant EU Directives
Do not dispose of in the normal waste stream
CONTENTS
3
SAFETY WARNINGS 2
GENERAL DESCRIPTION 4
OPERATION 5
Main menu screen 5
TEST menu 6
OPTIONS menu 7
CURRENT menu 9
Warning messages 9
Entering notes in the memo screen 9
Test result storage 10
Real time downloading of test data. 10
TEST TECHNIQUES & APPLICATIONS 11
Test sequence 11
Lead resistance 11
Interference and grounding the sample 11
SPECIFICATIONS 12
Repair and Warranty 13
End of life disposal 13
Produktspecifikationer
| Varumärke: | Megger |
| Kategori: | mätning |
| Modell: | DLRO 600 |
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