Pulsar TCF-10B, System Manual, Page: 185 / 249

Page 16–4 April 1997
TCF–10B System Manual
Technologies, Inc.
The two electro-mechanical output signals are:
• Trip 1/Trip 2
• Guard 1
16.1.4 Receiver Logic Front Panels
The front panel front panel of the TC–10B
Receiver Logic Module comes in three variations,
one for each of the three application types
(2-Frequency Directional Comparison,
3-Frequency Directional Comparison, and
2-Frequency Phase Comparison). Your module
comes with front panel that fits your application.
2-F Directional Comparison Front Panel
The front panel for 2-Frequency Directional
Comparison applications is shown in Figure 16-3.
Its four LEDs provide the following signal indica-
tions:
GOOD CHANNEL (this green LED is lit to
indicate an absence of noise and low level)
CHECKBACK TRIP (this red LED is lit to
indicate a low frequency is received; this
will be the only LED lit when a low
frequency is received after a loss-of-
channel without a guard return)
TRIP (this red LED is lit to indicate a low
frequency is received, i.e., the frequency
shifts low)
GUARD (this red LED is lit to indicate a high
frequency is received, i.e., no frequency
shift; the operation is normal)
3-F Directional Comparison Front Panel
The front panel for 3-Frequency Directional
Comparison applications is shown in Figure 16-4.
Its five LEDs provide the following signal indica-
tions:
GOOD CHANNEL (this green LED is lit to
indicate an absence of noise and low level)
CHECKBACK TRIP (this red LED is lit to
indicate a low frequency or high frequency
is received, depending on the position of
SW3-6; this LED will be lit without its
corresponding trip LED when the high or
low frequency is received following a loss-
of-channel without a guard return))
UB/POTT TRIP (this red LED is lit to
indicate a high frequency is received, i.e.,
the frequency shifts high)
DTT TRIP (this red LED is lit to indicate a
low frequency is received, i.e., the
frequency shifts low, indicating a direct
transfer trip)
GUARD (this red LED is lit to indicate the
center frequency is received, i.e., no
frequency shift; the operation is normal)
Figure 16–3.
Front Panel for 2-Frequency
Directional Comparison
(Transfer Trip/Unblock)
Applications.