500 WATT RADIOBEACON TRANSMITTER
ND2000A-02x-xx0
Page
4-13
15 January 2005
Table 4-6 Power Supply Module Controls and Indicators
PANEL MARKING/
REF
FIG
NOMENCLATURE
FUNCTION
DES
NO.
USED IN TEXT
*DS1
MD-23
CON24V
Indicates B- V dc to +24 V dc converter is providing
24 V dc when on.
*DS2
MD-23
POWER-DC SUPPLY
Indicates the B- voltage is present when on.
*F1
MD-23
CONVERTER
Fuses B- dc voltage being applied to B- V dc to +24 V
dc converter at 1.0 amperes.
*F2
MD-23
POWER-AC LINE
Fuses line side of the 230 V ac power being applied to
the power transformer (line
A
when ac power source is
North American style split phase) at 30 amperes.
*F3
MD-23
POWER-AC LINE
Fuses line
B
side of the 230 V ac power being applied
to the power transformer (when ac power source is
North American style split phase) at 30 amperes.
Bypassed when ac power source is European style
(line-neutral).
*S1
MD-23
POWER-AC LINE
Switches the ac power source, being applied to the
power transformer within the power supply module,
ON
or
OFF
when
POWER-AC LINE
switch A6S1 is set
to
ON
.
*A1R12
MD-26
B-Level
Adjusted to set the B- V dc output of the associated
power supply to precisely -50 V dc.
*A2A1R10
MD-27A
+24 VDC Level
Adjusted to set the 24 V dc output of the associated
power supply's B- V dc to +24 V dc converter to
pre24.0 V dc.
*A3R3
MD-27B
Low AC Voltage Threshold
Adjusted to provide a
Battery-Alarm
lamp indication
when the ac power source decreases by fifteen percent.
*TP1
MD-25
B- Volts
Provides a test point to monitor the B- V dc from
associated power supply (-50 V dc).
*
Denotes partial reference designation shown. For complete reference designation, prefix with A7 or
A8 as appropriate.
Refer to Figure MD-24 to locate A2 and to Figure MD-25 to locate A1 and A3.
