OPERATION AND INSTALLATION
RCI-4100 SYSTEM
MAN-1111 Rev H
©Copyright 2015 LSI-Robway Pty Ltd
Page 43
decrease the low end closer to zero then more amplification can be applied to make use of the full
range of raw counts. This is why an offset is used with all sensors.
What is gain level?
There are two types of gain settings for each channel, one in hardware and the other in software.
Gain is signal amplification and amplifies the signal level of the analogue channel to provide the widest
range of raw counts to ensure maximum resolution for each sensor.
Hardware gain is varied by setting jumpers for individual analogue channels on the PCB. Hardware
gains for each channel can be X1, X2 or X250:
•
X1 used for single ended voltage sensors such as length and angle sensors, and 4-20mA
sensors.
•
X2 is currently not used.
•
X250 used for 4 wire differential (full bridge strain gauge types as found in load cells).
Refer to Figure below.
Figure 13 – RCI-4100 Controller PCB Showing Gain Link Jumpers
Software gain level is settable via function codes (as a number) from 1 (no amplification input=output)
up to 1023 (maximum amplification).
LSI-Robway uses different types of load sensors and they can have different levels of output. For
example a load pin has 1mV/V output and tension plate cells generally have 2mV/V output.
The maximum differential input (strain gauge type) through Intrinsically Safe Barriers used on RCI-
4100IS is limited to maximum of 2.5mV/V.
Example:
A 1mV/V 5T load pin with 5V sensor excitation will have a 5mV differential output when loaded with
5T. Remember that with the in-built offset, raw counts start much higher than zero.
Using X250 hardware gain (selected with jumpers) and software gain of 790 would result in a raw
count spread of about 3700 raw counts, but with a starting offset this would mean the high end would
exceed 4050 raw counts (error condition). So an offset is applied so 0mV/V would result in 100 raw
counts, plus 3700 raw counts for the 0-5T load resulting in a maximum of 3800 raw counts.
Gain and offset for typical sensors are listed in the following section.
6.8.1.
Set Gain and Offset for Channels 1 to 8
This Gain function code refers to the gain setting of the amplifiers to match the signal output of the
sensors. There are a total of 8 channels available, but only channels 1 to 3 are used for this model.
Channel 1 is the main load sensor, channel 2 is the aux load sensor and channel 3 is the angle
sensor. Recommended settings of the gain are as follows:
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