Pulsar TCF-10B, System Manual, Page: 195 / 249

Page 16–12 April 1997
TCF–10B System Manual
Technologies, Inc.
Unblock Timer
(POTT/UB 3F)
The Unblock Timer provides a trip
window for the time set on loss of
channel, which is defined as low level
and loss of guard. You can set it for
150, 300, or 500 ms. The normal
setting is 150 ms in the Unblock
system and disabled for all other
applications. This timer is what
differentiates the Unblock system
from the POTT.
The unblock time switch settings are
listed in Table 16-12.
Trip Hold Timer (POTT/UB 3F)
The Trip Hold Timer lets you stretch
the trip output. You can set it for 10,
50, or 100 ms or disable (0 ms) it. We
recommend that you use the disabled
setting in the Unblock/POTT to avoid
problems with transient blocking.
The trip hold time switch settings for
3-frequency UB/POTT applications
are listed in Table 16-10. The trip
hold time switch settings for 3-
frequency DTT applications are listed
in Table 16-10.
TIME IN ms SW1-5 SW1-6
DISABLED OPEN OPEN
10 CLOSED OPEN
50 OPEN CLOSED
100 CLOSED CLOSED
Table 16–10. Trip Hold Time Switch Settings
for POTT/UB 3F Applications.
Guard Hold Timer
(POTT/UB 3F)
The Guard Hold Timer stretches the
guard output by the amount you set.
You can set it for 10, 50, or 100 ms or
disable (0 ms) it. The disabled setting
is appropriate for most applications.
The guard hold time switch settings
for 3-frequency UB/POTT applica-
tions are listed in Table 16-12. The
guard hold time switch settings for
3-frequency DTT applications are
listed in Table 16-11.
TIME IN ms SW1-7 SW1-8
DISABLED OPEN OPEN
10 CLOSED OPEN
50 OPEN CLOSED
100 CLOSED CLOSED
Table 16–11. Guard Hold Time Switch Settings
for POTT/UB 3F Applications.
TIME IN ms SW2-1 SW2-2
DISABLED OPEN OPEN
150 CLOSED OPEN
300 OPEN CLOSED
500 CLOSED CLOSED
Table 16–12. Unblock Time Switch Settings
for POTT/UB 3F Applications.
Position
when
shipped