Model TT235-0600
RTD/Resistance Thermometer Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 11 -
http://www.acromag.com
[
11
]
https://www.acromag.com
Output/Power
Connections...
In most installations, the loop power supply will be local to either the transmitter,
or local to the remote receiver. Common receiver devices include the input channel
of a Programmable Logic Controller (PLC), a Distributed Control System (DCS), or a
panel meter. Some receivers already provide excitation for the transmitter loop and
these are referred to
as “sourcing” inputs. Other receivers that do not provide the
excitation are referred to as “sinking” inputs, and these will require that a separate
power supply connect within the loop. These types of receivers are depicted below.
WARNING:
For compliance to applicable safety and performance standards, the
use of twisted pair output wiring is recommended. Failure to adhere to sound
wiring and grounding practices as instructed may compromise safety,
performance, and possibly damage the transmitter.
TIP
–
Ripple & Noise:
Power supply ripple at 60Hz/120Hz is normally reduced at the
load by the transmitter, but additional filtering at the load can reduce this ripple
further. For large 60Hz supply ripple, connect an external 1uF or larger capacitor
directly across the load to reduce excessive ripple. For sensitive applications with
high-speed acquisition at the load, high frequency noise may be reduced
significantly by placing a 0.1uF capacitor directly across the load, as close to the load
as possible.
TIP
–
Inductive Loads:
If the two-wire current loop includes a highly inductive load
(such as an I/P current-to-pressure transducer), this may reduce output stability. In
this case, place a 0.1uF capacitor directly across the inductive load and this will
typically cure the problem.
+
-
6
5
"SINKING OUTPUT" CONNECTIONS WITH
LOOP+
LOOP-
+
-
TWISTED PAIR
I
I
POWER LOCAL TO THE RECEIVER
The 24V DC Excitation is
Provided by the Card
+
RCV
DCS/PLC SINKING
24VDC
Two-Wire Output Connections to the Input Card of a Distributed Control
System or Programmable Logic Controller.
+
-
24VDC POWER SUPPLY
I
I
COMMON TWO-WIRE TRANSMITTER CONNECTION TO "SOURCING" AND "SINKING" INPUT RECEIVERS
+
-
INPUT CARD
-
+
RCV
+
-
P
DCS/PLC SOURCING
24VDC
INPUT CARD
+
-
OR
SOURCING INPUT RECEIVER
SINKING INPUT RECEIVER
The 24V DC Excitation is Provided
by a Separate Power Supply
MODEL TT2XX-0600 OUTPUT/POWER WIRING
ANY MODEL TT2XX-0600
5
6
–
+
8
7
C
C
INPUT SIDE
OUTPUT SIDE
TOP VIEW
(OUTPUT SIDE)
TB3
(OUTPUT)
TB1
(INPUT)
TB2
(INPUT)
TB4
(COMMON)
