Nautel XL12, Technical Instructions

Page: 33 / 238

12 000 WATT AM BROADCAST TRANSMITTER
XL12
Page 2-9
01 January 2002
2.1.11.9 B+ Power Supply Fault Alarm:
An
alarm output that indicates the RF output has been
inhibited, because the output of the B+ DC power
supply is not within 10% of its optimum voltage (over
or under) is available on TB3-5 (
B+ P/S FAIL ). A
negative logic output (current-sink-to-ground) will be
present for an alarm condition.
2.1.11.10 AC Fail Alarm:
An alarm output that
indicates the RF output has been inhibited; because
the voltage from the AC power source is more than
ten percent below the ideal voltage for the power
transformer's selected primary winding taps, or a loss
of phase has occurred; is available on TB3-6 (
AC
FAIL
). A negative logic output (current-sink-to-
ground) will be present for an alarm condition.
2.1.11.11 Power Supply Over Temp Alarm:
An
alarm output that indicates the RF output has been
inhibited, because the sensed temperature in the
AC/DC power supply compartment is in excess of
85
°
C, is available on TB3-7 (
P/S OVER TEMP
). A
negative logic output (current-sink-to-ground) will be
present for an alarm condition.
2.1.11.12 Battery Low Alarm:
An alarm output
that indicates the charge status of the batteries on
the system control PWB has decayed to less than
4.0 VDC and they should be replaced, is available
on TB3-9 (
BATTERY LOW ). A negative logic output
(current-sink-to-ground) will be present for an alarm
condition.
2.1.11.13 External Interlock Alarm:
An alarm
output that indicates the RF output is being inhibited,
because one or more of the external interlock
switches has been opened, is available on TB3-10
(
EXT INTLK OPEN ). A negative logic output (current-
sink-to-ground) will be present for an alarm
condition.
2.1.11.14 Internal Interlock Alarm:
An alarm
output that indicates the RF output is being inhibited,
because the transmitter's ground wand is not
properly stored in its retaining clip, is available on
TB3-11 (
INT INTLK OPEN ). A negative logic output
(current-sink-to-ground) will be present for an alarm
condition.
2.1.11.15 RF Power Shutback Alarm:
An alarm
output that indicates the RF output is being inhibited
(shutback), because a protection circuit threshold has
been exceeded, is available on TB5-1 (
RF PWR
CUTBACK ). A negative logic output (current-sink-to-
ground) will be present for an alarm condition.
2.1.11.16 RF Drive B+ Fail Alarm:
An alarm
output that indicates the RF output has been inhibited,
because the output of the RF drive amplifier's B+
DC power supply is less than 56V, is available on
TB5-2 (
RF DR B+ FAIL ). A negative logic output
(current-sink-to-ground) will be present for an alarm
condition.
2.1.11.17 PDM Failure Alarm:
An alarm output
that indicates the RF output has been inhibited,
because one or both of the pulse duration modulation
(PDM) outputs from the active interphase PDM
driver PWB has failed, is available on TB5-3 (
PDM
FAIL
). A negative logic output (current-sink-to-
ground) will be present for an alarm condition.
2.1.11.18 RF Drive Fail Alarm:
An alarm output
that indicates the RF output has been inhibited,
because the peak-to-peak voltage of the RF drive
being applied to the FETs in the RF amplifiers of the
RF power module is less than 17.5 volts peak-to-
peak, is available on TB5-4 (
RF DRIVE FAIL
). A
negative logic output (current-sink-to-ground) will be
present for an alarm condition.
2.1.11.19 Low DC Volts Fail Alarm:
An alarm
output that indicates the RF output has been inhibited,
because the output of one of the low voltage DC
power supplies (+8V, +5V, -5V, +15V or -15V) has
failed, is available on TB5-5 (
LV P/S FAIL ). A
negative logic output (current-sink-to-ground) will be
present for an alarm condition.