Siemens eWON4002 - Manual (Page 12)

eWON4002™
Installation Guide
page 9 of 35
ver 2.04
3.7 Preparing the installation
The recommended free space in the cabinet for the eWON® on the wall for the eWON1002™ should be at least: 80-
mm wide X 225-mm high X 200-mm deep (terminal block excluded). A piece of rigid DIN-rail profile (flat 35mm wide)
of suitable length should be firmly fastened, horizontally, in the middle of the area.
Grounding the eWON® is necessary to eliminate unwanted transients (lightning protection) and to conform to the
EMC requirements. Therefore, a ground screw is available at the back of the unit just below the DIN latch. Connect
this screw directly to a low impedance ground.
3.8 Specifications for external power supply selection
The eWON500™ eWON2001™ eWON4001™ eWON4002™ has to be supplied by an external voltage source
ranging from 12 to 24 VDC. The power supplied must be SELV-compliant (security voltage) and limited in current to
a max of 300mA. The safety voltage power supply is not part of the delivery. The data given below is intended to
allow correct selection of the external power supply.
Table 4: Specification for external power supply selection
(*) Properly ground the unit with the earth screw at the bottom of the unit. This is a must to ensure
the security and the electromagnetic compatibility (EMC) of the device.
3.8.1 Auto fuse
An auto fuse placed just after at the power input protects the eWON® devices against short circuits. This component
returns by itself to its normal state when the short circuit has disappeared and after the component has been cooling
down. Would this fuse happen to operate, please check the device for presence of loose metal parts inside likely to
generate a short circuit. If the problem recurs even after such a verification, then return the device to the vendor for
further investigation.
Specification Value
Secondary PS voltage from 12 to 24 VDC +/-20% (SELV-compliant)
Max secondary PS current 300 mA max.
eWON® current protection 300 mA by auto fuse
eWON® voltage protection 30V by varistor
eWON® EMI filter Common mode filter (*)
Power absorbed (typ)
5 Watts (eWON4002 ™ PSTN)
6 Watts (eWON4002 ™ GSM/GPRS)