Cleveland Motion Controls DIN Rail Amplifier MWI-13261 Ultra Series Isolated REV BA - Manual (Page 23)

MAN-13261 R EV BA DIN R AIL A MPLIFIER , MWI-13261 U LTRA
• Passing a cord over a roll on its way to the transducer will cause some amount of friction.
The worst case scenario is in passing the working part of a cord over a roll that doesn’t
readily freewheel. A test was conducted to determine the loss on a stationary 4” diameter
anodized roll with a 90 degree wrap angle. It exhibited a 25 to 30% loss in force due to
friction!
• Always apply and remove the test load in a continuously increasing or decreasing
manner, so that the force changes are monotonic. This helps to avoid disturbing any
hysteresis component of the transducers force signal.
• When calibrating for a particularly wide roll that will always have a narrower product
tracking to one side, consider applying the calibration force at the roll position that
represents the center of the product. This will automatically cancel some of the affects of
transducer gain imbalance without the need to actually re-balance the transducers gains
within the amplifier.
• It is a good practice to verify linear operation of the transducer and amplifier by applying
a final test force that falls somewhere between the zero and full-scale endpoints. The
intent is not to conduct calibration, but to confirm the hardware’s ability to accurately
report a measured force.
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