Siemens 6DR55 Series Manual page 68

Preparing for operation
Non--hazardous area
Approved associated apparatus
or barrier
+
--
EEx
EEx
DP/PA coupling
Figure 35 Electric connection of basic device with in intrinsically safe version
Non--hazardous area
+
--
DP/PA coupling
Figure 36 Electric connection for positioner in explosion proof version or in type of explosion protection "n"
version
Safety position
66
≤ 30 V
PROFIBUS PA
≤ 24 V
≤ 30 V
≤ 32 V
PROFIBUS PA
The positioner is equipped with an additional input (terminal 81 [+] and
terminal 82 [--]) for driving to the safety position. After activating this
function this input must be supplied with uninterrupt +24 V, to allow
normal positioning operation.
If this power supply is switched off or drops out, the air exhaust valve is
automatically opened and the drive will move to the pre--arranged
safety position, so that the drive cannot be activated using the keys on
the control unit or by means of the master switch. The communication
with the Master is still possible.
This function is activated by the coding bridge on the motherboard.
This is accessible after removing the module cover and must be moved
from the right position (as delivered) to the left position.
Hazardous area zone 1
81
Input: Safe position
82
6
7
8
+
3 V
9
10
Hazardous area
81
Input: Safe position
82
6
7
8
+
3 V
9
10
Positioner
Binary input 1
Positioner
Binary input 1
SIPART PS2 PA Manual
A5E00127926--05