User guide

3-14 l Installation
Checking Repeatability
Before any Conair Medline Combination Puller/Cutters are shipped, they are tested
for cut time repeatability to be sure they are within performance specifications. The
repeatability test checks the performance of the rotary knife cutter to return to 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
CMSC Positional Servo Less than 0.1 millisecond
NOTE: 1-millisecond at 60 feet per minute is equal to .012 inches.
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 softkey “Test” to display DevCP screen.
4 Press softkey “On/Off” to start the testing and display the results.
5 Pressing “Next” key displays DevCC results.
NOTE: “Previous” key returns to DevCP screen.
Repeat the test by pressing the “Reset Cut” button to begin a new sample period.
To end the Repeatability test, press softkey “On/Off” or “Exit”.
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IMPORTANT:
See Operation
Section entitled, Tuning the
Cutter
, if using Red Lion HMI
and Control Techniques/
Emerson Servo Drives