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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
- 12 -
https://www.acromag.com
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection
to itself.
If the module is mounted in a metal housing, an earth ground wire
connection to that
metal housing’s ground terminal (green screw) is usually
required using suitable wire per applicable codes. Isolated circuits wired to
this carrier are normally earth grounded. Power connections usually apply
earth ground at DC- to the unit. Output connections apply earth ground to
the transmitter output common terminal. Circuits wired to analog inputs
should be earth grounded as reflected in their connection diagram for the
specific module model. Ground connections noted are recommended for best
results and help protect the unit and its isolated circuitry by giving it a low
impedance path to ground for shunting potentially destructive transient
energy away from sensitive module circuitry. Refer to the Electrical
Connection Drawings for recommended input, transmitter output, and power
ground connections.
Interposing Relay Connections
If you need to raise your alarm control capability and drive larger loads with
load voltages and/or current demands greater than the rated capacity of this
unit’s mechanical or solid
-state outputs, then you may choose to instead drive
a higher capacity interposing relay that connects to the load, in similar fashion
to the following figures (always be sure to also include inductive load
protection at your load as shown on the next page):