Siemens 6DR55 Series, Manual

Page: 65 / 178

Preparing for operation
63
SIPART PS2 PA Manual
A5E00127926--05
!
CAUTION
To discharge impulses under fault conditions, the positioner must be
connected via a low resistance to an equipotential bonding (ground
potential). For this the positioner in plastic housing is provided with an
additional cable. Connect this cable using the cable clip to the
PROFIBUS cable shield and to the equipotential bonding.
Devices in metal housings have a corresponding terminal on the
outside of the housing, which also must be connected to equipotential
bonding.
Provide for suitable potential equibonding between the hazardous and
non--hazardous areas for applications in areas where there is a risk of
explosions.
Shield
Figure 31 Base plate
Fitting the bus cable
Normal, intrinsically safe and zone 2
versions.
Explosion proof version
1. Isolate the bus cable as shown in figure
32, page 64.
1. Isolate the bus cable as shown in figure
32, page 64.
2. Open the positioner housing by undoing
the four cover screws.
2. To open the positioner, the cover catch
(12) must be undone and the screw cover
unscrewed.
3. Insert the prepared bus cable through the
cable gland.
3. Insert the prepared bus cable through the
Ex--d--certified cable gland *)
4. Secure the shield with the cable clip and
the two screws to the housing.
4. Secure the shield with the cable clip and
the two screws to the housing.