64 95 142 D3632
D3632
.
031.01.02
.
02 03.2016
85
Sirona Dental Systems GmbH
9 Safety checks
Installation Manual ORTHOPHOS SL
9.1 Checking the protective ground wires
båÖäáëÜ
Check whether the protective ground
wire resistance complies with the
specifications
✔
A power source with a current of at least 0.2 A, a no-load voltage of
24 V max. and 4 V min. is required.
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 unit leakage current first.
A and B
GNYE wire
0.1 Ω
A and C
2. Protective ground
wire
0.1 Ω
A and D
Housing DX32
0.2 Ω
A and E
Tube assembly
housing
0.2 Ω
