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試験装置 Major tech MT325のPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Major tech MT325 4 ページ。 Rcd/elcb tester
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4.2. Preparation
•
Set Trip Current Range Switch to a rated trip current of the circuit
breaker under test.
•
Connect the instrument to the breaker, make sure that both P-E and P-
N lamps are illuminated. If not disconnect the instrument and check
wiring at the socket or distribution board for a possible fault.
4.3. No Trip Test (Guard against nuisance tripping)
•
Set function switch to No Trip position.
•
Hold down the Test Button. A half (50%) of the rated trip current
selected will pass through the breaker for 2000ms. The breaker should
not trip at this test. This is checked by the continued illumination of the
P-N and P-E lamps. The no trip current sensitivity of the breaker is now
tested OK. If the breaker should trip because of a fault, the display
reads the trip time with P-N, P-E and test lamps extinguished. The
reading is displayed only while the Press to Test Button is held down. It
will display the result for approx. 10 seconds before changing.
•
Reverse 0°/180° selector position and repeat step 2.
4.4. Trip Test (Correct operation of breaker)
•
Set function switch to Trip position
•
Hold down the Test Button. The rated trip current (100%) of the circuit
breaker current selected will pass through the circuit breaker to
2000mS max. At this test the breaker trips and all lamps go out. The
reading is displayed only while the Press to Test Button is held down. It
will display the result for approx. 10 seconds before changing.
•
Reset the breaker and reverse 0°/180° selector position for a re-test.
The trip time displayed will be different from the readout on the
previous test.
•
If the breaker does not trip the P-N and P-E lamps will remain
illuminated.
4.5. Fast Trip Test
This test is especially required for a circuit breaker fitted to lessen the hazard
of electrical shock that might result from direct contact.
•
Set function switch to Fast Trip position (this will override all functions)
•
Hold down the Test Button. Regardless of the trip current selected
250mA current will pass through the circuit breaker for 40ms maximum.
As on the trip test the circuit breaker trips and all lamps go out. The
reading is displayed only while the Press to Test button is held down. It
will display the result for approx 10 seconds before changing.
•
Reset the breaker and reverse 0°/180° selector position for a re-test.
The breaker should trip at these two tests within 40ms. If not the
breaker is probably faulty.