User's Manual

P.G. TM0040AE
2-3
2.2 FAULT REPORTING
2.2.1 General
- The amplifier incorporates a number of circuits to detect deviations in
important performance parameters. The unit reports alarm conditions to a remote Monitor
unit such as the Model PS212.
The various functions are described in this section and may also be referenced in Section 4
where the programming of amplifier options is discussed.
2.2.2 Report Types
- The unit generates two types of reports depending on the status of
the amplifier as determined by the built in monitor circuits. Each type consists of a numeric
code sent as low frequency tones along the coaxial cable for decoding at the monitor unit.
Under normal operation the unit will transmit an "OK" code at intervals of approximately 80
minutes. This enables the system monitoring unit to keep track that the whole system is
connected and operational. In this mode a local green NORMAL LED lamp is illuminated
on the side of the amplifier.
In the event that a fault is detected in the amplifier, as described later, a "FAULT" code is
transmitted on the cable at intervals of approximately 80 seconds. In this mode a local red
FAULT LED is illuminated on the amplifier. Four LEDs on the side of the unit indicate
which specific local condition is causing the overall FAULT condition as described in the
next section.
In each case the code transmitted identifies the transmitting amplifier by the FAULT CODE
programmed in that particular amplifier as described later in Section 4.6. Before shipment
P.G. programs each amplifier with an arbitrary code from 1 to 199 which is also shown by a
label on the outside of the unit.
NOTE:
Older models of P.G. bidirectional amplifiers such as the A181 or A188 transmitted
only fault codes, but are compatible with the fault codes transmitted by the A289.
When used with a PS212 Monitor, the A181 or A188 codes should be entered in
the ID list as "FAULT ONLY" (TFO) type units. If the A289 is used with a PS200
PS/Monitor the OK code transmission (STATUS option) should be disabled
(section 4.4) as it will cause the PS200 to display a FAULT alarm. Fault codes
above 199 should not be set on any amplifiers since they may be incorrectly
interpreted by the newer PS212.