Watlow PPC-2000 - Manual (Page 76)

Chapter 2: Hardware Installation PPC-2000 User’s Guide
52 Watlow Anafaze Doc.# 30002-00 Rev 2.3
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CAUTION! Do not connect the COM terminals on the AITB to
earth ground. Connecting COM to earth ground limits
the input protection to ±10Vac and could result in
damage to the input circuit.
Connecting Sensors with Linear Voltage Signals
For sensors with single output connections, connect the
negative input (
B terminal) to the sensor common terminal.
Differential voltage transducers or sensors, such as bridges,
should be connected with the positive signal lead on the
A
terminal and the negative signal lead to the B terminal for the
selected input. See Figure 2.35.
Check sensor power supply connections and ground
connections to avoid exceeding the common mode range of the
Analog Input module or creating ground loops.
Figure 2.35 Connecting Linear Voltage Signals to
Differential Inputs 1 and 2
Single-ended voltage sources should have the positive lead on
the positive terminal of the desired input. The negative lead
should be connected to the
COM terminal. See Figure 2.36 on
page 53.
Transducer
1A (input 1+)
1B (input 1-)
+
+
-
with linear
voltage
output
Transducer
with linear
voltage
output
2A (input 2+)
2B (input 2-)
COM
COM
AITB