Xicom AND XT-100 Operation & Installation Manual - page 22
2-10
Installation
XT-50, XT-80, and XT-100 Amplifiers
••
Helix/Arc Fault Latched (Pin A)
. (Active = low) When active,
indicates there have been 3 successive Helix over current/arc faults
within the amplifier and the amplifier is now turned off.
Pin A
is
now shorted by open collector to ground
Pin W
. Maximum open
voltage is 20 volts and maximum switched current is 3 mA. The
switch is an isolated photo-coupler. After three successive
helix/arc faults, the automatic cycle is terminated and this line is
active (low).
••
Helix/Arc Fault (Pin C)
. (Active = low) When active, indicates
there is a helix/arc fault within the amplifier when
Pin C
(+) is
connected by open collector to ground (
Pin W
). Maximum open
voltage is 20 volts and maximum switched current is 3 mA. The
switch is an isolated photo-coupler.
The amplifier will reset itself immediately after a helix/arc fault, hence will
only momentarily activate.
••
Heater Timer Complete (Pin G)
. (Active = low). When active,
indicates the heater delay is complete when
Pin G
(+) is connected
by open collector to ground (
Pin W
). Maximum open voltage is 20
volts and maximum switched current is 3 mA. The switch is an
isolated photo-coupler.
••
TWT Temperature Fault (Pin H)
. (Active = low) When active,
indicates there is a TWT Temperature fault within the amplifier
when
Pin H
(+) is connected by open collector to ground (
Pin W
).
Maximum open voltage is 20 volts and maximum switched current
is 3 mA. The switch is an isolated photo-coupler. This is not a
latched fault. The amplifier will turn itself on once the TWT has
cooled to an acceptable temperature.
A TWT Temperature fault may occur from a number of
causes: (1) air intake filter clogged, (2) cooling fins clogged,
(3) fan failure, or (4) fan power supply failure.
••
High Voltage ON (Pin K)
. (Active = low) When active, indicates
that the amplifier is on when
Pin K
(+) is connected by open
collector to ground (
Pin W
). Maximum open voltage is 20 volts and
maximum switched current is 3 mA. The switch is an isolated
photo-coupler.
••
Fan ON (Pin M)
. (Active = low) When active, indicates that the
amplifier's main cooling fan is on when
Pin M
(+) is connected by
open collector to ground (
Pin W
). Maximum open voltage is 20
volts and maximum switched current is 3 mA. The switch is an
isolated photo-coupler. The main cooling fan is controlled by the
temperature of the TWT. The fan will cycle on and off in cooler
ambient conditions. The fan is typically operated below the
manufacturer's nominal design voltage.