Rockwell Automation 20L PowerFlex 700L Frame 1X Liquid-Cooled Adjustable Frequency AC Drive - Manual (Page 34)

PowerFlex 700L Frame 1X Drive Installation Instructions – Publication 20L-IN013A-EN-P – June 2009
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Table 12 J2 RTD Board I/O Function Settings
Important: A motor temperature sensor (RTD, NTC or thermocouple)
should be considered equivalent to a motor thermostat and
wired with the same considerations. Motor thermostat contacts
are generally not isolated from the drive/controller digital
inputs. Therefore, the sensor inputs will not be isolated on the
RTD board.
Hardware
The hardware consists of a single PC board with two wired connectors, one
for temperature sensors and the second for power and I/O signals.
RTD/NTC Sourcing
A 2-wire RTD or NTC temperature sensor may be used. A chassis
connection is available for each sensor for use with shielded cable. Each
channel requires up to three connections.
Multiplexer and Amplifier
An analog multiplexer sequentially connects the temperature sensors one at
a time to the analog output. The active sensor channel is indicated by a 3-bit
output (A0…A2). When using an RTD or NTC, a simple voltage divider is
formed and the device is probed differentially.
The sensor voltages are amplified using a high-quality, rail-to-rail
instrumentation amplifier with gain adjustment. To accommodate a variety
of sensors and temperature ranges, an amplifier boosts the analog sensor
voltage in order to increase the temperature resolution. Discrete gains of
x10 through x80 are selectable through DIP switch settings. A 4th order low
pass filter rejects normal-mode noise at the analog input with a cutoff
frequency of approximately 16 Hz.
To determine the proper gain setting:
1. Determine R
MAX
, the maximum resistance of the sensor over the
temperature range to be measured.
J2 Position I/O Function
1 +24V COM
2 LOUT1 COM
3 LOUT2 COM
4 LOUT3 COM
5 LIN COM
6 AOUT COM
7 +24VDC
8 LOUT1 NO
9 LOUT2 NO
10 LOUT3 NO
11 LIN
12 AOUT