Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 12 -
http://www.acromag.com
- 12 -
https://www.acromag.com
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. This dual transmitter
’
s inputs, outputs, and
power circuit are electrically isolated from each other, allowing each of 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 housing
and you should 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, Output, and Power, and note the
position of earth ground for each isolated entity. Ground connections shown 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 destructive transient
energy away from sensitive module circuitry.
•
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).
