Grounding - Siemens SINUMERIK 840Di Manual

2 Hardware Descriptions
2.12 I/O Module PP72/48
2.12.4

Grounding

!
2-102
Moreover, the external power supply voltages for the I/O modules PP72/48, the
digital outputs, and optionally the digital inputs must meet the specifications
according to Table 2-23.
Table 2-23 Specification of the power supply voltage P24OUT,
Voltage
minimum
nominal
max.
minimum (dynamic)
maximum (dynamic)
Non-cyclic overvoltage
max. (absolute, transient)
max. duration
min. recovery time
max. events per h
Voltage failure for min. power supply voltage
1)
max. duration
min. recovery time
max. events per h
Power consumption
max.
On the module side the power supplies must be protected against:
S
Polarity reversal
S
Short-circuit (elec. current limitation of the outputs)
S
Overload (fuse protection).
The installation of the module must be performed acc. to EN 60204.
If a large-area, permanent metallic connection with the central ground point
through the rear panel is not possible, the mounting plate must be connected to
the grounding by means of a line (cross section >10mm
Caution
A protective conductor must be connected.
20.4V
24V
28.8V
18.5V
30.2V
35V
500msecs
50secs
10
50msecs
1s
10
approx. 40W
2
).
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03