Ametek UPLC-II System Manual page 119

5.7.3.2 Trip Duty Outputs (Fig. 5–11)
There are four trip duty relay outputs enabled on the
UPLC-II™, if this option is ordered. The trip duty
relay programmable selections are shown in Table
5–15. There are hardware jumpers to select for
either a normally open or normally closed contact.
Although these output contacts can trip a breaker
directly (30 A for 200 msec), they can only interrupt
0.5 A at 125 Vdc.
5.7.3.3 Low Level Outputs (Fig. 5–12)
There are ten Low Level outputs available to be
programmed to various output functions. Seven of
these outputs are isolated transistor outputs that can
be set for either 0.1 A or 1.0 A output. It is recom-
mended to use the 0.1 A selection if your load is less
than 0.1 A, such as, for microprocessor based relay
inputs. The reason for this is to prevent any possi-
bility of leakage current especially at 250 V station
battery. (In the 0.1 A setting the high power transis-
tors that leak very small currents are jumpered out.)
Three of these low level outputs are electromechan-
ical relays. There are hardware jumpers to select for
either a normally open or normally closed contact.
These contacts have a 0.5 A interrupt rating at 125
Vdc. All ten of these outputs may be programmed
to one of several functions or to a not used state.
The available output functions are shown in Table
5–16.
If you want a UPLC-II™ alarm output to be fail-
safe, you have to use one of the 3 low level EM con-
tact outputs (Outputs LL08–LL10). By fail-safe,
that means the output will alarm for the set condi-
tion and also for loss of dc power to the UPLC-II™.
NOTE:
LL01 – LL07 outputs are transistor switches
and if normally closed is selected, the tran-
sistor is energized when that output is inac-
tive. Because of this, the transistor will de-
energize if the power is turned off to the set.
If it is desired to have a normally closed
state during power off then select a normally
closed contact of one of the low-level relay
outputs LL08 – LL10.
January 2016
Chapter 5. installation/Commissioning Procedure
Tables 5–13 & 5–14 show the definitions of all the
outputs depending on whether the unit is set in
ON/OFF or FSK mode.
For monitoring the overall hardware health of the
UPLC-II™, it is recommended the General Alarm
output be used. This alarm output is a fail-safe
alarm. That is, the General Alarm is normally ener-
gized and drops out when any major hardware fail-
ure occurs on any board. See Chapter 3 alarm tables
for available TX/RX level alarms not covered by
the General Alarm. These tables show what causes
the alarms and whether the output is closed or open
when the alarm is active.
NOTE:
The Power Supply alarm output is separate
& not shown on the web page as it is a direct
hardware fail alarm to the Power Supply ter-
minal blocks (TB1 & TB2). A Power Supply
alarm will also cause a General Alarm out-
put.
Two RX alarm outputs, which are illustrated in sec-
tion 5.7.1 earlier, deserve special mention for clari-
ty. They are the RX Fade Alarm and RX Good
Channel outputs available in the FSK mode. The
Good Channel Alarm is dependent on the RX fade
margin setting to which the receiver is calibrated.
When calibrating a receiver, you establish how
much signal degradation (signal fade margin) is tol-
erable, usually either 15 or 20 dB. This allows the
unit to keep working when a condition causes extra
loss such as bad weather or aging/minor failure of
components in the overall system. When the RX
level degrades past the RX fade margin threshold
then the Good Channel output drops out for the loss
of channel condition.
The RX Fade Alarm is set to activate before the
Good Channel output drops out and to be an early
warning that the signal level is dropping before a
complete loss of channel occurs.
The RX Fade Alarm output is also available in the
ON/OFF mode. However, because this alarm output
picks up only when the receiver is receiving an RF
signal, it is really not an "alarm" in this mode but
rather only an indication of receipt of signal when
the far end TX is turned on.
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