Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 11 -
http://www.acromag.com
- 11 -
https://www.acromag.com
Optional Bus Power Connections
TIP:
How many units may share a
bussed connection to power? This
device consumes up to 1.6W. For
a bussed power connection, it is
recommended that you fuse-limit
the maximum supply current to 3A
or less including inrush. The turn-
ON inrush current may peak up to
twice its DC value. To calculate
the safe maximum number of units
that can share this supply
connection, multiply 1.5A and your
supply voltage and divide the
result by 1.6W. For this model,
this is roughly equivalent to the
number of supply volts. That is, a
24V supply fused with 3A may
drive 24 units safely.
Power is normally wired to the TB5 terminals of the unit as shown on the previous
page. However, this dual channel device is equipped to be optionally or
redundantly powered via a DIN rail bus connector (Acromag 1005-063) mated to an
optional plug-in terminal block (Acromag 1005-220 or 1005-221, depending on left
side or right-side wire entry). Any power input via the bus connector is diode-
coupled to the same point in the circuit as unit power connected at its power
terminal TB5. You could power multiple units by snapping them together along the
DIN rail bus using connector 1005-063, then connecting a mating terminal block
(select a left side or right-side connector, see figure below). While the intent of the
bus power connector is to allow several units to conveniently share a single supply,
you could also use the bus power connector to redundantly power units (with local
power also applied at TB5), allowing a backup supply to maintain power to the units
should the main supply at TB5 fail.
Acromag TTBUS-KIT connector kit contains bus connector 1005-063, plus left-side
terminal 1005-220, and right-side terminal 1005-221, allowing units to snap
together, side-by-side, along the DIN rail and share the power connection.
Important
–
End Stops:
If this module uses optional power (or redundant power)
via its DIN rail bus for hazardous location installations (Class I, Division 2 or
ATEX/IECEx Zone 2) it should use two end stops (like Acromag 1027-222) to secure
the terminal block and module (not shown).
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