Acromag, Inc. Tel: 248-295-0880
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Model SP33X-0700
4-Wire DC I/V Signal Splitter w/USB
Optional Bus Power
Connections…
The figure below shows how to wire power to the optional bus terminal block when
mated to the bus connector. Note that power is wired to the rightmost bus
terminals on the right, or the left-most terminals on the left. Observe proper
polarity.
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection. The internal input, each output, and power
circuits are electrically isolated from each other, allowing these circuits to be individually earth grounded as indicated. If
the transmitter is mounted in a metal housing, a ground wire connection is typically required for the enclosure and you
shou
ld connect that metal enclosure’s ground terminal (green screw) to earth ground using suitable wire per applicable
codes. See the Electrical Connections Drawings for Input, Outputs, and Power, and note the position of earth ground for
each isolated entity. The input and each output circuit return are internally shunted to earth ground applied at the power
minus terminal via internal isolation capacitors.
•
Avoid inadvertent connections to earth ground at other points than those indicated, as this could drive ground
loops and negatively affect operation.
•
A USB isolator is recommended when configuring or calibrating a unit to avoid the ground loop that occurs if
your input is also earth grounded (A PC commonly earth grounds its USB port contacting both the USB signal and
shield ground which are held in common to the input circuit ground of this transmitter).