Tuttnauer 1730 M, Technician Manual

Page: 12 / 51

10
6 MAINTAINING AND REPLACING PARTS
6.1 Safety Tests after Repair
ATTENTION!
After every repair or dismantling the enclosure, the autoclave
should pass two safety electrical test by the Service Engineer. The
following shall be performed:
Warning!
When re-installing the enclosure, connect the earthing to the cover.
On installing the rear cover, connect the earthing before
accomplishing the installation of the rear cover.
6.1.1 Enclosure Leakage Current Test.
Every autoclave should pass this test as follows:
1. Connect the electrical cord to the autoclave.
2. Turn on the main switch and the circuit breaker.
3. Short-circuit the L and N pins on the cord's plug.
4. Connect the Short-circuit pins to the L pole on the Megger.
5. Connect the earth pins to the earth pole on the Megger.
6. Impose an electrical potential of 500-1000V on the tested
autoclave. The insulation resistance should be at least 2
M
Ω .
The test is successful if there was no leakage.
6.1.2 Protective Earth Impedance Test
1. Connect the grounding pin of the power cord plug to one
pole of an Ohmmeter.
2. Connect any other metallic part (preferable – the metallic
part of the locking screw) to the second pole of the
Ohmmeter.
3. The resistance should not exceed 0.3 Ω.
After performing these tests, the Service Engineer should complete and
sign the Work Order.