78
Siemens-Elema AB
E382 E380E 061 01 03 01
Description of functions
Servo Ventilator 300/300A
2
21.2 Voltage distribution
The different voltage levels used in the
ventilator are regulated in and distributed
from this block. The fuse F1, rated F 6.3 A,
limits the total +24 V supply current.
The distributed voltage levels are:
• +24 V: (+24 V
FUSED
) fused at F2, rated
F 1.6 A, via P74
• +24 V: (+24 V) limited at R33, a PTC
resistor rated 1.1 A at 20°C, for the 11.4
SAFETY
VALVE
via P73
• +24 V: (+24 V
VALVE
) from the electronic
VALVE
POWER
SWITCH
via P74
• +24 V: (+24 V
LOW
POWER
REG
) used only in
the mode selector via P70
• +24 V: (+24 V
PO
) unregulated voltage,
21 – 34 V, via the auxiliary outputs N77
and N78
• +15 V: (V+) regulated in the
DC
/
DC
CONVERTER
via P74
• -15 V: (V-) regulated in the
DC
/
DC
CONVERTER
via P74
• +5 V: (VC5) regulated in the
INTERNAL
5
V
REGULATOR
and used only internally in
PC 1618
• +5 V: (+5 V) regulated in the
DC
/
DC
CONVERTER
via P74
• +5 V: (+5 VL) regulated in the
DC
/
DC
CONVERTER
used only in the front panel via
P74.
The battery connections are equipped with
fuses:
• Internal battery connection is fused at F3,
rated F 6.3 A.
• External battery connection is fused at F4,
rated F 6.3 A.
The number of fuses on PC 1618 and the
location of these fuses can vary depending
on the different PC-board versions.
21.3 Voltage control & Timing
This block administrates the different power
supply sources.
If power suppy is lower than the limits
stated below, the external battery will
automatically be used as power source.
If no external battery is connected, the inter-
nal battery will be used as power source.
• Mains
is used as power supply source as
long as mains power is connected and the
voltage level, detected by the +24
V
VOLTAGE
DETECTOR
, is above 19.2 V.
• External battery
is used as power supply
source:
– if the external battery voltage level is
above 23 V in the moment when it is
connected
and
– as long as the voltage level in the
connected external battery is above
21.5 V.
Older versions of PC 1618:
The 23 V limitation mentioned above does
not exist and the external battery voltage
level, detected by a
EQUIPOTENTIAL
DETECTION
,
must be above 20.25 V.
•
Internal battery
is used as power supply
source as long as the internal battery
voltage level is above 19.5 V. If the voltage
level drops below 19.5 V, no power supply
is distributed to the ventilator valves.
Older versions of PC 1618:
The internal battery voltage level, detected
by a
EQUIPOTENTIAL
DETECTION
, must be above
18.5 V.
The battery voltage levels can be displayed
in the Alarm and Message display on the
front panel. The displayed value "Internal" is
the charging voltage at the internal battery
connection (P72).
Содержание Servo Ventilator 300
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