microBlox® Transmitter/Alarm Carrier
Model uBTA-H-1MR/uBTA-H-1SR/uBTX-H-1
Acromag, Inc. Tel: 248-295-0880
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http://www.acromag.com
- 25 -
https://www.acromag.com
Alarm Configuration
Alarm functionality of alarm carriers (uBTA-H-1x) can only be configured via a
Bluetooth wireless technology connection from an Android or iOS smartphone
or tablet and the Acromag Agility mobile app to your specific uB model.
Alarm Operating Types
Dual Limit:
Limit alarms have a high/low set-point applied to the input and
assigned to a relay. The relay will enter the alarm state when either the user-
defined high or low set-point is exceeded and remains in alarm until the input
has retreated past the set-point, plus any dead-band.
Dual Window:
Window alarms have both high and low set-points defined at an
input and assigned to a relay, such that the alarm relay will enter the alarm state
for levels outside the window and remain in alarm until the input signal has
retreated inside the window past the defined set-point, plus its dead-band.
Alarm Set-point
A high or low level (plus dead-band) may be assigned to each relay and is
programmable over the entire input range of the module. In general, the relay
will trip on an increasing signal for a high set-point, and on a decreasing signal
for a low set-point.
Alarm Dead-band
A region associated with each set-point level that is programmable over the
entire input range. Dead-band determines the amount the input signal must
return into the “normal” operating range before the relay contact will
transfer
out of the “alarm” state.
Dead-band is normally used to eliminate false trips or
alarm “chatter” caused by
small fluctuations in the input near the set-point
levels.
Reverse-Acting Alarm Output
(Failsafe/Non-Failsafe Operation)
IMPORTANT:
Noise and/or jitter on the input signal has the effect of reducing
(narrowing) the dead-band region and may produce contact chatter
—
you may
increase dead-band to squelch this chatter. This is very important for
mechanical relays because a negative effect of continued contact chatter is
reduced mechanical relay contact life.
For
“
Failsafe
” operation
, the relay is de-energized in the alarm state (reverse
acting enabled). For Non-Failsafe operation, the relay is energized in the alarm
state. Failsafe simply refers to matching the contact closure in alarm to that for
power loss, while a non-failsafe alarm uses an alarm contact closure opposite to
power loss conditions. You may select Reverse-Acting for an alarm to effectively
achieve “fail
-
safe” operation as required (note that the uBTA
-H-1MR model has
both normally open and normally closed contacts).