2.1 Supplementary electrical conditions
2-27
Copyright © Siemens AG 2006
SINUMERIK 810D Equipment Manual Configuration CCU (PHC) – 03/2006 Edition
Basic insulation Protective separation
M (GND)
3 x 400 V AC
N
Housing/shield
810D/611 digital
1
2
3
4
10
4
4
5
6
11
S7-300 I/Os
MSTT/MCP
PCU
9
24V
8
Person
M (GND)
7
10
11
11
Machine
5
4
Distributor box
HHU/
HT 6
Terminal
block
Fig. 2-1 Protective separation as per EN 61800-5-1
Fig. 2-1 shows the potential balance of the 810D/611D/S7-300 system. Legend:
1. Floating power supply of the SIMODRIVE electronics unit with 230 V AC
basic insulation.
2. Floating transistor triggers for the three-phase rectifier bridge with 230 V AC
basic insulation.
3. Floating transistor triggers for each axis of the three-phase inverter bridge
with 230 V AC basic insulation.
4. Floating signal connection from the CCU to the PCU or HHU/HT 6 with
230 V AC basic insulation.
5. Non-floating signal line between CCU and I/O devices.
6. Non-floating end user interface with protective separation for 230 VAC
through interfaces 1 to 4 and 7.
7. Protectively separated 5 V DC power supply, fed from a protectively separa-
ted 24 V DC supply.
8. 24 V DC power supply unit for external devices and for the machine adapta-
tion control according to applicable standards in the form of a PELV (Protec-
tive Extra Low Voltage) circuit featuring safe isolation.
9. Floating interfaces to the machine (not accessible to the end user).
10. Floating signal interfaces directly accessible to the end user (e.g. V.24). For
these interfaces, you must always make sure that there is either safe isola-
tion with respect to the line supply voltage or that there are two basic insula-
tion levels, for 230 V AC each.
11. 5 V DC power supply with basic insulation, fed from a safely-isolated
24 V DC supply.
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