Instruction Manual

14
4.5 USE OF THE SHIELD CONNECTION
The shield connection provides a third input which is switched as each channel is
measured. It is the ground reference for the measurement section. By switching this
reference with every channel, the effective measurement ground can float to match the
ground at the sensor, thus greatly reducing the error caused by different ground
potentials (common mode).
The system is factory set for use with non-shielded cables. Jumper JU1 connects all low
inputs to shield. Normally when non- shielded cables are used, this will result in the
lowest noise pick-up.
If shielded cables are used, the shield should be connected to ground or the low signal
output at the sensor if possible. If this is done, jumper JU1 must be removed and all non-
shielded inputs must have a jumper connected between the low input and the shield input
at the ANAFAZE 8 PID.
WARNING - USE SHIELD CORRECTLY
If the shield is used for any input always remove the factory installed
jumper JU1. If the jumper is removed the shield must be individ
connected for each input.
4.6 INPUT CIRCUITS
WARNING - PRODUCT CHANGE NOTICE
This section applies to serial numbers greater than 1333. After serial
number 1333 the input circuit has been changed to add a position for
a fourth input resistor.
The ANAFAZE 8 PID contains an isolated area that can be used to install resistors to
scale input voltages and connect inputs to match the 0 to 60mv (0 to 100%) input range.
Inputs are scaled by installing resistors for each channel. The input circuit is designed to
enable connection of current inputs (such as 4 to 20ma), for voltage inputs, and for
connection of transducers (RTD) in bridge configurations. Please consult ANAFAZE for
additional information. ANAFAZE will supply fully configured units for different
applications—please consult the factory for a quotation. The input circuit is shown
below: