Siemens Servo Screen 390, Service Manual, Page: 12 / 49

Servo Screen 390
12 E382 E394E 061 01 02 02
Siemens-Elema AB
2. Description of functions
2
General
The text in this chapter refers to the block
diagram in chapter 7, “Diagrams” (on the
inside of the back cover).
Power supply
With Servo Ventilator 300/300A
The power supply is connected to the power
inlet port PWR (P21) on Servo Screen 390.
The internal power cable connects the
power inlet port to the A
DAPTER
B
OARD
at P18.
The PWR port is described in chapter
7, “Diagrams”.
Power to the Servo Screen 390 is supplied
from the Servo Ventilator 300/300A auxiliary
equipment output N78.
Connector N78 is described (output signals
and limitations) in the Servo Ventilator 300/
300A – Service Manual.
With Servo Ventilator 900C/E
The power supply is connected to the power
inlet port PWR (P21) on Servo Screen 390.
The internal power cable connects the
power inlet port to the A
DAPTER
B
OARD
at P18.
The PWR port is described in chapter
7, “Diagrams”.
Power to the Servo Screen 390 is supplied
from an AC Power Adapter 124 when used
with a Servo Ventilator 900C/E.
Technical specifications for the AC Power
Adapter 124:
Mains power supply ........... 100 – 240 V
Mains frequency ................. 50 – 60 Hz
ON/OFF-indication .............. Green LED indi-
cates power on
Output voltage range .......... 24 V DC ±10%
Output power ..................... max. 50 W
Earth leakage current,
normal condition
(IEC 601-1-1) ....................... 30 A
Fuse (internal) ..................... 2.4 A slow