Rosemount 8732 Series, Справочное руководство

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Reference Manual
00809-0100-4663, Rev BA
January 2010
2-7
Rosemount 8732
Requirements for 12-42 V DC Power Supply
Units powered with 12-42 V DC may draw up to 1 amp of current. As a result,
the input power wire must meet certain gauge requirements.
Figure 2-4 shows the supply current for each corresponding supply voltage.
For combinations not shown, you can calculate the maximum distance given
the supply current, the voltage of the source, and the minimum start-up
voltage of the transmitter, 12 V DC, using the following equation:
Figure 2-4. Supply Current
versus Input Voltage
Installation Category
The installation category for the Rosemount 8732 is (overvoltage) Category II.
Overcurrent Protection
The Rosemount 8732 Flowmeter Transmitter requires overcurrent protection
of the supply lines. Maximum ratings of overcurrent devices are as follows:
Connect Transmitter
Power
To connect power to the transmitter, complete the following steps.
1. Ensure that the power source and connecting cable meet the
requirements outlined on page 2-8.
2. Turn off the power source.
3. Open the power terminal cover.
4. Run the power cable through the conduit to the transmitter.
5. Connect the power cable leads as shown in Figure 2-5.
a. Connect AC Neutral or DC- to terminal 9.
b. Connect AC Line or DC+ to terminal 10.
c. Connect AC Ground or DC Ground to the ground screw mounted
inside the transmitter enclosure.
MaximumResis ce tan
SupplyVoltage 12 – VDC
1amp
-------------------------------------------------------------------- =
Power Supply (Volts)
I = 10/V
I = Supply current requirement (Amps)
V = Power supply voltage (Volts)
Supply
Current (Amp
s)
12 18 24 30 36 42
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Power System Fuse Rating Manufacturer
110 V AC 250 V; 1 Amp, Quick Acting Bussman AGCI or Equivalent
220 V AC 250 V; 2 Amp, Quick Acting Bussman AGCI or Equivalent
42 V DC 50 V, 3 Amp, Quick Acting Bussman AGCI or Equivalent