Nautel XL12, Technical Instructions

Page: 40 / 238

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 2-16
01 January 2002
#12 to A23A1T1-Y1
#13 to A23A1T1-Y2
#14 to A23A1T1-Y3
(d) Locate three grey, 20AWG wires (#329, #330
and #331 which originate at the DC power
supply PWB and route them to the vicinity of
the fuseholder (XF1) on the top of the
transformer. Connect:
#329 to A1T1XF1-2
#330 to A1T1XF1-4
#331 to A1T1XF1-6
2.2.7 AC POWER CONNECTION:
Install the
circuit breaker enclosure (ac input switch) supplied
with the transmitter and the interconnecting electrical
wiring, between the AC power service entrance and
the transmitter as follows:
NOTE
The user must determine the entry point for the
AC power wiring and then open the appropriate
sized cable entry hole in the transmitter cabinet.
Pilot holes are located at both top, rear corners
to accommodate top entry. The installer must
drill or punch the appropriate sized cable entry
hole.
A double knockout is located at the bottom, rear,
left-hand corner (viewed from front) of the
cabinet to accommodate bottom entry. Access is
gained through a hole in the AC/DC power
supply chassis. If this option is selected, the
installer must knock-out the appropriate sized
cable entry hole.
If any other entry location is required, the
installer must ensure the wiring will not interfere
with transmitter assemblies and then drill/punch
the appropriate sized cable entry hole.
It is recommended the interconnecting electrical
wiring be installed in a metal conduit which is
rigidly attached at both ends.
2.2.7.1 Installation of Circuit Breaker
Enclosure :
Install the circuit breaker enclosure in
close proximity to the transmitter, noting it is a
dedicated interface between the AC power service
entrance and the transmitter. Refer to figure MD-29
for the circuit breaker enclosure's dimensional/
assembly information.
NOTE
The circuit breaker enclosure contains a number
of knockouts (top and bottom) to accommodate
different wiring configurations. The installer
must knock out the appropriate cable entry holes
where the electrical wiring enters/exits the
enclosure.
A sealed safety wire is installed thru holes in the
bolts which secure IEC125 key lock systems. It
provides a visual confirmation the lock has not
been tampered with. Removal or breaking the
seal of this safety wire will defeat its purpose and
may compromise the safety of maintainers.
2.2.7.2 Installation of AC Power Wiring
(Service Entrance to Enclosure):
Connect the
AC power wiring which will interconnect the service
entrance to the
LINE side of the circuit breaker in the
circuit breaker enclosure. All wiring must be in
conformance with the local electrical codes.
NOTE
Do not install a neutral conductor unless the
local electrical code specifically requires it. If it
is necessary, connect it as dictated by the local
codes.
2.2.7.3 Installation of AC Power Wiring
(Enclosure to Transmitter):
Connect the AC
power wiring which will interconnect the
LOAD
side
of the circuit breaker (in the circuit breaker
enclosure) to main power contactor A23K2 and
A23TB1 (ground) (in the transmitter) as follows
(refer to figure MD-2 as an aid in locating A23K2
and A23TB1, noting they are accessed through the
rear door):
(a) At the transmitter end, route AC power wiring
through the preselected and prepared cable
entry hole to the vicinity of contactor A23K2
and terminal board A23TB1. Cut each
conductor to length and install them as follows:
Line (
φ
) 1 - A23K2-L1
Line (
φ
) 2 - A23K2-L2
Line (
φ
) 3 - A23K2-L3
Ground - A23TB1-2
NOTE
A23K2 terminals require a 5/32 inch or 4mm hex
head wrench.