Metek RCT 10 series, Installation And Operating Instruction

Page: 48 / 134

RCT 10, 11, 12, 13 Series
40
Figure 4-1
Typical Transmitter Loop
Typical Transmitter Loop
Nominal
24Vdc Supply
17-30 Vdc
ABC 7 DEF 8
GHI 9
ABC 7 DEF 8 GHI 9
ABC 7 DEF 8 GHI 9
ABC 7 DEF 8 GHI 9
ABC 7 DEF 8 GHI 9
ABC 7
DEF 8 GHI 9
ABC 7 DEF 8 GHI 9
–
+
Resistance added if
necessary to make total loop
resistance at least 250 ohms
during the communication
process.
2-wire twisted
shielded pair
(recommended)
4.23
Optional loop
powered indicator
e.g. DLM4000 series
Calibrator or PC Modem may be
connected anywhere on the
transmitter side of the 250 ohm
resistance. Voltage at the transmitter
terminals must be at least 12 volts
with 20 mA of loop current.
Other possible loop devices
such as a setpoint controller.
Optional
Safety
Barrier
HART®
Compatible
4.2 Start-up
After the RCT Series transmitter is installed and loop
power is applied, per Section 2, do the following:
1. Connect the Rosemount Model 275 as shown in
Figure 4-1.
2. Turn on the Calibrator and look for the ONLINE
screen to appear. ONLINE means that the 275
Calibrator has recognized the RCT Series and is
ready for Configuration and Calibration.
3. You must start the process by doing the
Configuration first-- followed by Calibration. There
are also instructions for configuring the Strapping
Tables and for doing a D/A Trim to make the loop
output agree with a calibration standard for loop
current.