User guide

Testing Repeatability
Before any Conair puller/cutters are shipped, they are tested for cut time repeata-
bility to be sure they are within performance specifications. The repeatability test
checks the performance of the rotary knife cutter to return the home park position
after a complete cut. Acceptable repeatability times allowed for each cutter model
prior to shipping are:
Type of Cutter Repeatability Time
AC Pneumatic Cutter Less than 1 millisecond
DC Pneumatic Cutter Less than 1.5 millisecond
Velocity Servo (E Drive) Less than 1 millisecond
Positional Servo (FX) Less than 0.1 millisecond
CSC Positional Servo Less than 0.1 millisecond
The repeatability mode is built into the Conair cutter controls and allows you to
perform similar tests, without any external test equipment. It is recommended that
you check repeatability on a regular basis. Acceleration/deceleration delays of the
servo do not contribute to repeatability error; any error is attributed solely to motor
stability, couplings, assembly, power, and proximity sensor alignment.
Use any blade speed and line speed. The line speed is only seen while in the
Encoder or Product modes. It is recommended that the tests be performed at cut
intervals between 0.5 and 5-seconds. Do not change the blade speed or the line
speed after starting the test.
To test repeatability:
1 Turn on the cutter. Perform the test in encoder mode with the cutter on-line.
The Display will read: DevCP shows problems with the cutter. DevCC shows
problems with the puller.
2 Press the menu key to display operator functions.
3 Press soft key test to display DevCP screen.
4 Press soft key on/off to start the testing and display the results.
5 Press next key displays DevCC results.
Repeat the test by pressing the Reset Cut button to begin a new sample period.
To end the Repeatability test, press soft key on/off or exit.
NOTE: 1-millisecond at 60 feet per minute is equal to .012 inches.
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NOTE: Previous key returns to DevCP screen.
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6-18 l Troubleshooting
NOTE: See Operation Section
entitled, Set Up 2 Page
Description, Tuning the Cutter if
using Red Lion HMI and Control
Techniques/Emerson Servo Drives
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