Nautel XL12, Technical Instructions

Page: 39 / 238

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 2-15
01 January 2002
(b) Secure each RF power module to its mounting
tray using the retaining screw which is
accessed through the hole in the front panel.
Firmly tighten retaining screw.
NOTE
The retaining screw requires a slotted screwdriver
(c) Complete the electrical interconnection of each
RF power module to the cabinet cableform
wiring by mating the associated cableform
connector with A1J1 of the module. A1J1 is
located on the bottom of the module,
immediately in front of the retaining screw.
Secure cableform connector to module
control/monitor PWB using thumb screws on
connector. Use the following as a guide when
installing connectors:
P41 to A1J1 of RF power module A3.
P42 to A1J1 of RF power module A4.
P43 to A1J1 of RF power module A5.
P44 to A1J1 of RF power module A6.
P45 to A1J1 of RF power module A7.
P46 to A1J1 of RF power module A8.
P47 to A1J1 of RF power module A9.
P48 to A1J1 of RF power module A10.
2.2.6.4 Installation of Main Power Transformer:
Install the main power transformer assembly in the
cabinet as follows:
The main power transformer (weighs
approximately 160 kg (350 lbs). Do not attempt
to move it unless sufficient manpower or
mechanical assistance is available to move it into
position without damaging the cabinet or causing
injury to personnel.
(a) Obtain the transformer's attaching hardware,
which consists of two sets of M10 hardware
(one bolt, one flat washer and one split washer
per set), noting it is located in a plastic bag
secured to wiring at the bottom, rear of the
AC/DC power supply compartment.
(b) Position the power transformer assembly
directly behind the cabinet, with its taps facing
the right side (viewed from rear) as depicted in
figure MD-2.
Ensure the two large, electrolytic capacitors,
protruding thru the bottom of the 8-input RF
combiner/filter (A22), are not damaged during
installation of the power transformer.
(c) Carefully lift or slide the power transformer
into the cabinet. Ensure mounting holes in its
base are aligned with locating holes in the
cabinet's bottom.
(d) Secure the base of the power transformer to
the cabinet in two places (terminal side nearest
front of cabinet and opposite side nearest rear
of cabinet). Use attaching hardware obtained
in step (a).
2.2.6.5 Connection of Powe r Transformer
(A23A1) Wiring:
Connect the wiring which was
disconnected to remove the power transformer
(refer to figure MD-23 or MD-24 to identify specific
areas of the power transformer assembly) as
follows:
(a) Locate three black, 6AWG wires (#6, #7 and
#8) which originate at terminals of AC power
contactor A23K2, a black 8AWG jumper
which originates at the station reference
ground terminal and a black 18AWG wire
(#342) which originates at LVPS transformer
assembly and route them to the vicinity of the
transformer's 'H' terminals. Connect:
#6 to A23A1T1-H1
#7 to A23A1T1-H2
#8 to A23A1T1-H3
#342 to A23A1T1-ground stud
8AWG jumper to A23A1T1-ground stud
(b) Locate three black, 6AWG wires (#9, #10 and
#11) which originate at rectifier assembly A25
and route them to the vicinity of the
transformer's 'X' terminals. Connect:
#9 to A23A1T1-X1
#10 to A23A1T1-X2
#11 to A23A1T1-X3
(c) Locate three black, 6AWG wires (#12, #13
and #14) which originate at rectifier assembly
A26 and route them to the vicinity of the
transformer's 'Y' terminals. Connect: