46
Reference Manual
00809-0300-4750, Rev CA
Advanced Installation Details
March 2016
Advanced Installation Details
Figure 3-10. Wall Mount Transmitter — Connect Discrete Output to Relay or Control
System Input
A. Digital output 1
B. Digital output 2
C. 5–28 VDC power supply
Note
Total loop impedance must be sufficient to keep loop current below maximum rating. A
resistor can be added in the loop to raise impedance.
3.4.3
Connect discrete input
The discrete input can provide positive zero return (PZR) or net totalizer reset. The following
requirements apply:
Supply Voltage: 5 to 28 VDC
Control Current: 1.5 — 20 mA
Input Impedance: 2.5 k
Ω
plus 1.2 V Diode drop. See
To connect the discrete input, complete the following steps.
1.
Ensure the power source and connecting cable meet the requirements outlined
previously.
2.
Turn off the transmitter and discrete power sources.
3.
Run the power cable to the transmitter.
4.
Connect terminals.
a.
For Field Mount, connect -DC to terminal 5.
b. For Field Mount, cDC to terminal 6.
OR
a.
For Wall Mount, connect -DC to terminal 10.
b. For Wall Mount, cDC to terminal 9.
and
C
+
-
C
-
+
B
A
1k
1k
Summary of Contents for Rosemount 8750W
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