Grounded Installation - Siemens SIMATIC Distributed I/O System DP/ASi Link Manual

Installing and Wiring the DP/ASi Link
4.2.1

Grounded Installation

Introduction
With grounded installation of the DP/ASi link, you have to connect the refer-
ence potential of the electronics section to the protective conducter.
Note that in this case only the power supply for the electronics (M24V) is
grounded. The PROFIBUS-DP bus and the AS interface are not grounded by
this action.
Rules For grounded installation you must pay attention to the following points:
4-4
You have to provide a master switch (1) conforming to VDE 0100 for the
DP/ASi link.
For the connection of the external power supply (24 VDC) to the supply
system, you require a fuse (2).
For the power supply, use a Siemens Series 6EV1 external power supply
(refer to catalog ET 1).
If you connect other external power supplies (24 VDC), make sure that
the voltage is between 20 and 30 V (including ripple). The external power
supply must generate a functional extra-low voltage with safe electrical
isolation in accordance with VDE 0106, Part 101. For non-stabilized ex-
ternal power supplies, you require a backup capacitor (200 F per 1 A
load current, (3)).
Provide a separable connection (4) to the protective conductor on the ex-
ternal power supply (terminal M) in the secondary circuit.
The 24 VDC supply should be fused separately (5).
With both grounded and ungrounded installation,connect the PI connec-
tion of the DP/ASi link in a low-resistance manner to the protective con-
ductor (6).
On the right side of the DP/ASi link and of the power supply connector
there is a screw for connecting the conductor conducter.
The protective conductor terminal of the DP/ASi link is connected inter-
nally to a pin 9 of the circular connector (refer to Table 4-3).
All machine parts have to be grounded.
Use a minimum diameter of 10 mm
ground connections.
2
for equipotential bonding and
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b