Rosemount 8712, Справочное руководство

Страница: 21 / 212

Reference Manual
00809-0100-4664, Rev BA
January 2010
2-11
Rosemount 8712
The pulse output option requires an external power source. Complete the
following steps to connect an external power supply.
1. Ensure that the power source and connecting cable meet the
requirements outlined previously.
2. Turn off the transmitter and pulse output power sources.
3. Run the power cable to the transmitter.
4. Connect –DC to terminal 6.
5. CDC to terminal 5.
Refer to Figure 2-7 and Figure 2-8.
Figure 2-7. Connecting to a
Electromechanical
Totalizer/Counter
Figure 2-8. Connecting to a
Electronic Totalizer/Counter
without Integral Power Supply
Connect Auxiliary
Channel 1
Auxiliary channel 1 can be configured as either a digital input or a digital
output. When configured as an input, the following requirements apply:
When using channel 1 as a digital input, the power source and the control
relay must be connected to the transmitter. See Figure 2-9 for more details on
this connection.
Electro-mecha
nical Counter
5–28 V DC
Power
Supply
+
–
–
–
+ +
Electronic
Counter
5–28 V DC
Power
Supply
1k to 100 k
Typical 5 k
–
+
+ –
+
–
Supply Voltage: 5 to 28V DC
Maximum Power: 2 watts
Switch Closure: optically isolated solid state switch
Maximum Impedance 2.5 k
