Installation - Input Wiring Procedures 
Release M    DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual  29 
April 2017     
2.6  Input Wiring Procedures 
Wiring the recorder 
Using the information contained in the model number, select the appropriate wiring diagrams from the 
figures listed below and wire the recorder accordingly. 
 
Thermocouple, RTD, Radiamatic, mV, or 0–5 Vdc Inputs 
4–20 mA Current Outputs or Auxiliary Outputs #2 and #3 
Position Proportional Control Outputs 
Relay Control Outputs 
  – Time Proportioning 
Alarm #1 and #2 Outputs and Digital Inputs 
Alarm Outputs #3, #4, #5, and #6 
RS485 Modbus Communications 
 
Ferrite filter locations (CE Mark) 
Inside of the enclosure, install ferrite suppression filters on all wires connected to the recorder. ©Fair-Rite 
Products Corp. part number 0443164151, or equivalent, shall be installed as shown in Figure 2-11, one 
filter for each circuit group. Cable with an outer jacket diameter larger than 6.7 mm (0.264 in.) may require 
the outer jacket to be removed to fit the required one turn in the filter, or the selection of a different cable. 
Shield Wiring 
The shield wires of all cables, except the Modbus RS485 communications cable, should be tied to earth 
ground at the recorder end and to earth ground through a .0047µF Capacitor at the other end of the cable. 
An example of shield wiring to an external ground bus bar is shown in Figure 2-11.