SIEMENS
2/81
Siemens IC 10 · 2017
* You can order this quantity or a multiple thereof.
Illustrations are approximate
AS-Interface
Slaves
Modules with Special Functions
Overvoltage protection module
2
■
Overview
AS-Interface overvoltage protection module
The AS-Interface overvoltage protection module (protection
module) protects downstream AS-Interface devices or individual
sections in AS-i networks from conducted overvoltages which
can be caused by switching operations and remote lightning
strikes. The location of the protection module forms the transition
from zone 1 to 2/3 within the lightning protection zone concept.
Direct lightning strikes must be coped with using additional
protective measures at the transitions from lightning protection
zone 0A to 1.
With the AS-Interface overvoltage protection module, it is now
also possible to integrate AS-Interface in the overall overvoltage
protection concept of a plant or machine.
The module has the same design and degree of protection
(IP67) as the AS-Interface K45 compact modules. It is a passive
module and as such does not need its own address
on the
AS-Interface network. The module can be used to protect the
AS-Interface cable and the cable for the auxiliary voltage from
overvoltage. Overvoltages are discharged through a ground ca-
ble with a green/yellow oil-proof outer sheath. This cable is fixed
in the module and must be connected with low resistance to the
system's ground.
Rated discharge current
I
sn
The rated discharge current is the peak value of a surge current
of the form 8/20
s (microseconds), for which the protection
module is designed in accordance with a specified test pro-
gram. With an 8/20 waveform, 100 % of the value is achieved
after 8
s and 50 % after 20
s.
Protection level
U
p
The protection level of a protection module is the highest
momentary value of the voltage at the terminals, established in
individual tests and characterizes the capability of a protection
module to limit overvoltages to a residual level.
Configuration guidelines
The grounding of protection modules and the units to be pro-
tected must be effected through a shared grounding point.
If insulated devices are protected, their mounts must be
included in the grounding points.
Sample application
■
Selection and ordering data
AS-
Inter-
face
AS-
Inter-
face
NSA0_00093a
OVP = Overvoltage protection
Mounting plate
Application
Device with
ground terminal
Device without ground terminal
→ Grounding of the mounting plate
Application
OVP
Version
SD
Article No.
Price
per PU
PU
(UNIT,
SET, M)
PS*
PG
d
AS-Interface overvoltage protection module
5
3RK1901-1GA01
1
1 unit
42C
Scope of supply includes mounting plate
(for wall and standard rail mounting)
NSA0_00092b
AS-
Inter-
face
A
B
AS-
Inter-
face
AS-
Inter-
face
AS-
Inter-
face
OVP = Overvoltage protection
OVP
OVP
protected range
Zone 1
Zone 1
Zone 2
Protection approx. 5 m to the right
Equipotential bonding
(system earth)
Protection approx. 0.5 m to the left
© Siemens AG 2016