0-60031-4 | RELIANCE ELECTRIC MODULE I/O

lnput signals:Pin E: Current transformer 1 (+)Pin F: Current transformer 1 (一)Pin H: Current transformer 2 (+)Pin J: Current transformer 2(-)Armature current feedback is used for the following purposes:Feedback for the current algorithmOvercurrent protectionApplication control tasksMotor CEMF determinationThe armature current feedback signal originates from two current transformers (CTs) monitoring theA-C line current to the SCR bridge.The D-C Power Technology module full-wave rectifies andconverts this signal into a D-C voltage signal proportional to the armature current using an internalfixed 10.2 ohm burden resistor. The resuliting voltage signal is scaled by a programmable gainamplifier (PGA). The PGA output is integrated from sCR firing to SCR firing to provide atime-averaged current signal. This minimizes errors common to sampling techniques,such assampling during a line spike or notch.The measured armature current is displayed in amps in register 208/1208 of the UDC module’sdual port memory. It is displayed in counts in register 207/1207.Refer to Appendix E in the D-CDrive Configuration and Programming instruction manual (S-3006) for information regardingarmature current feedback scaling