Guidelines for Handling Electrostatically-Sensitive Devices (ESD)
B-3
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
B.2 Electrostatic Charging of Persons
Charging
Every person with a non-conductive connection to the electrical potential of its
surroundings can be charged electrostatically.
Figure B-1 shows you the maximum values for electrostatic voltages which can
build up on a person coming into contact with the materials indicated in the figure.
These values are in conformity with the specifications of IEC 801-2.
Voltage in kV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(kV)
510
20 30 40 50 60 70 80 90 100
Relative air
humidity in %
1
3
1 Synthetic material
2
Wool
3
Antistatic material, for
example, wood or concrete
2
Figure B-1 Electrostatic Voltages which can Build up on a Person
www.PLCworld.cn
To Next Page
Loading...
