Dual 4-20Ma Output Driver - ProMinent Aegis-II Assembly And Operating Instructions Manual

Cooling tower and boiler controller

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6.3.16 Dual 4-20mA Output Driver

Two outputs fully isolated from each other and from the mother board.

Output open loop alarm; Maximum load of 450ohm @ 21.5mA, 480 ohm @20.5mA. Drive voltage maximum; 18VDC open

circuit. We recommend a maximum length of 1,000 feet using 22 AWG wire or larger. Twisted, shielded, stranded cable is

best for long distances.

Does not have a passive output. The loop is powered by the driver card.

Scale to any engineering units, forward or backward.

Examples:

4mA = 200 GPM and 20mA = 0 GPM

4mA = 32⁰F and 20mA = 212⁰F

4mA = -500mV and 20mA = 500mV

Can be used for proportional control of a pump or analog valve.

Can be used as a process variable to a DCS or chart recorder.

Table 11 Dual mA Output Connections

The dual 4-20mA output driver is equipped with onboard power which is used to

power or excite, the output loops. Therefore, the input device must not power the

loop. mA loops cannot be powered from two sources!

Figure 59 Dual mA Output Connections

Page 45 of 102

Mounting and Installation

Figure 58 Dual 4-20mA

Output driver

Figure 60 Dual mA Output with

Prominent Universal Control

Cable on output 1.

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