Skanti TRP 9250, Technical Manual, Page: 81 / 289

POWER SUPPLY
DC SUPPLY ONLY
This section applies if the optional built-in AC Power Supply Assembly P 9250 is not installed.
The supply leads are connected to the 24 V DC supply terminals of the Transceiver Unit located
on the Connection Board. Screened power supply cable may be used as required by some
administrations. The screen of the cable is connected to chassis by a cable clamp. Attention should
be paid to CCIR Rec. 218-1 which recommends that cables in the vicinity of the receiving antennas
or the radio receiving room, and cables within the radio room, are screened by enclosing them in
metal conduits, unless the cables themselves are effectively screened.
The earth connection of the equipment will not cause the battery to be earthed. Maximum
permissible peak voltage between the battery terminals and earth is 100 V. Note that fuses must
be provided in the supply leads.Table below shows the necessary cable cross sections and external
fuse ratings.
Max. cable length
to battery *
Recommended cable
Screened multiwire
External fuses
7 m 2 x 10 mm2 40 A
11 m 2 x 16 mm2 50 A
17 m 2 x 25 mm2 63 A
AC / DC SUPPLY
This section applies if the optional built-in AC Power Supply Assembly P 9250 is installed.
Before connecting the AC mains, check that the voltage selector switch on the AC Power supply
assembly is set to the correct voltage and that the fuse rating corresponds to the setting used.
The voltage selector is located at the AC Power Supply Assembly below the Connection Board.
The selected voltage is indicated by an arrow in the outer ring. The equipment is normally dispatched
with the selector set to 220 V. To select a different voltage, insert a screwdriver in the slot and turn
the switch to the correct setting.
Setting Voltage range
110 99 - 132 V
220 198 - 264 V
Caution: Incorrect setting of the mains voltage selector may damage the AC Power
Supply Assembly
The AC mains fuse holder is an integral part of the AC terminal block which is located to the left
of the Connection Board. The fuse is accessed by pulling out the black handle, The correct fuse
rating for each voltage setting is as follows
Setting Fuse rating
110 8 A Slow
220 4 A Slow
Fuses are cartridge type measuring 20 x 5 mm.
INSTALLATION POWER SUPPLY
3-10 TRP 9250 TECHNICAL MANUAL