Current Outputs: Other Applications | C-1
CURRENT OUTPUTS: OTHER APPLICATIONS
This appendix describes how to do the following:
• Modulateexternalpowerloopusingcurrentoutputs.
• Powercurrentoutputsfromanexternalpowersupply.
Powering Current Outputs from an External Power Supply
The Series 2000 control unit wiring card contains a set of terminals that
can be used to connect an external voltage source to power the standard
current outputs:
VEXT1,2 +
VEXT1,2 -
Jumper JP2 on the Series 2000 control unit display module is used to al-
low you to define which power source to use. If JP2 is in (factory default),
the control unit uses the internal supply to power the current output
circuits. If you try to use an external voltage at this time, the system will
use whichever voltage is higher - control unit voltage is normally about
28 volts. If the JP2 jumper is removed, the external voltage source must
be used to power the current output circuits. The external voltage source
must be no greater than 30 volts DC. See the “Option Card Installation”
section in the Installation Chapter for information on how to access or
remove the display module.
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