Checking The Protective Ground Wires - Sirona ORTHOPHOS SL 2D Service Manual

10 Maintenance
10.16 Checking the protective ground wires
Check whether the ground wire
resistance complies with the
specifications
462
10.16

Checking the protective ground wires

DANGER
General - Ground wire test
Perilous shock hazard!
It is essential to switch the unit off and to wait at least one more 1 minute
before beginning the check!
1. Switch the line voltage off at the main switch of the building
installation.
2. Disconnect the power cable and the second protective ground wire
from the building installation.
3. Remove the "bottom profile", "front tube assembly", and "rear tube
assembly" covers [ → 37].
Measuring setup for protective ground wire test
Measuring setup - Ground wire test
A Ammeter
B Power source
C Measuring point A, central protective ground wire
D Voltmeter
E Measuring points B - E
A and B
A and C
A and D
A and E
✔
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.
Sirona Dental Systems GmbH
Service Manual ORTHOPHOS SL
A
A B
V
B
C
E
D
E
GNYE wire 0.1 Ω
2. Protective ground 0.1 Ω
wire
Housing DX32 0.2 Ω
Tube assembly 0.2 Ω
housing
D3632.076.01.03.02 09.2016
A
C
D
64 95 258 D3632