Micromod MOD: 30ML Installation - Manual (Page 50)

MOD 30ML Multiloop Controller
POWER, GROUNDING, AND BUILT-IN I/O CONNECTIONS
3.5.3 Built-In Current Input - 2-Wire Transmitter
Make input connections from a 2-wire transmitter as shown in Figure 3-5.
22 mA Maximum Loop Current
When the maximum required loop current is 22 mA or less, make connections as shown in
the left hand view of Figure 3-5. In this connection arrangement, the 2-wire loop receives its
current from a 24V supply in the controller. The current supply is automatically connected in
the circuit when the 2-wire input connection is made.
50 mA Maximum Loop Current
If the maximum required loop current is 50 mA, make connections as shown in the right hand
view of Figure 3-5. In this connection arrangement, an external power supply must be used
to meet the 50 mA requirement.
Current input and transmitter power supply specifications are:
Input Range: 0 to 20 mA dc, Limited to below 70 mA
Input Impedance: 100 ohms nominal
Resolution: less than 1 microamp
Accuracy: ±0.1% of input or 2 microamps, whichever is greater
Temperature Effect: 0.01% per °C or 0.2 microamps per °C, whichever is greater
Transmitter Power Supply: Isolated 24V dc, 20 mA transmitter power supply is built into
controller. For current inputs above 20 mA, a separate external power supply must be
used.
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