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4/00 UDC 3300 Controller Product Manual 33
Transmitter power for
4-20 mA 2-wire
transmitter—auxiliary
output
The wiring diagram example shown in Figure 2-20 (Model
DC330X-XX-2XX or DC330X-XX-5XX) provides 30 Vdc at terminal 16
with the capability of driving up to 22 mA, as required by the transmitter
which is wired in series.
If the transmitter terminal voltage must be limited to less than 30 volts,
you can insert a zener diode between the positive transmitter terminal and
terminal 16. For example, an IN4733A zener diode will limit the voltage
at the transmitter to 25 Vdc.
Configure:
AUX OUT = OUTPUT
Calibrate the Auxiliary Output using the procedure given in Section 8.4 –
Auxiliary Output Calibration.
ZERO VAL = 4095
SPAN VAL = 4095
Figure 2-20 Transmitter Power for 4-20 mA 2-wire Transmitter Using Auxiliary Output—
Model DC330X-XX-2XX or DC330X-XX-5XX
24172
L1
L2/N
22
23
24
16
17
25
26
27
+
–
2-wire
Transmitter
250 ohm
resistor
+
–
+
–
15
If necessary, install zener
diode here to reduce
voltage at transmitter.