Sirona ORTHOPHOS SL 2D Service Manual page 463

Sirona Dental Systems GmbH
Service Manual ORTHOPHOS SL
64 95 258 D3632
D3632.076.01.03.02 09.2016
1. Connect the power source between the measuring points specified in
the table for at least 5 s.
2. Measure the voltage drop with the voltmeter, measure the current
with the ammeter, and calculate the resistance using the formula
R = U / I.
If the resistance value is greater than indicated in the adjacent
table, check whether the protective ground wires are fastened
according to the specifications.
Check whether plain washer, tooth lock washer and cable lug are
installed on the protective ground wire in the correct order and
whether the nuts of the protective ground wire connections are
firmly tightened.
If the fastening of the protective ground wires does not meet the
specifications, fasten the protective ground wires correctly.
Tip:Do not connect the power cable and the second ground wire to the
building installation yet. Check the device leakage current first.
10 Maintenance
10.16 Checking the protective ground wires
463