Ametek Thermox CEM O2/TM, User Manual

Page: 163 / 168

Current Outputs: Other Applications
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C-1
CURRENT OUTPUTS:
OThER APPlICATIONS
This appendix describes how to do the following:
• Power current outputs from an external power supply.
• Modulate external power loop using current outputs.
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 allow 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.