Before any Conair puller/cutters are shipped, they are tested for cut time repeatability to be sure they are within perfor- mance specifications. The repeatability test checks the perfor- mance of the rotary knife cutter to return the home park posi- tion 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

Positional Servo (FX)

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 recommend- ed 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. Performing the test with the cutter

 

 

 

off-line shows problems with the cutter; performing the

 

 

 

 

 

test with the cutter on-line shows a problem with the

 

 

 

puller.

 

 

 

Place the cutter in any mode except follower

 

2

 

 

 

mode.

 

 

 

Press the Cut On/Off button; the cutter is activated

 

3

 

 

 

automatically.

 

 

 

Press and hold the Move Right button

 

 

 

4

 

 

 

 

 

for a minimum of 5 seconds.

 

 

 

 

 

Read the results on the display.

 

 

 

5

 

 

Repeat the test by pressing the Reset/Test Cut button to begin a new sample period.

To end the Repeatability test, press any button except the Reset/Test Cut button. The LED returns to its normal display.

TESTING

REPEATABILITY

UGE059/1003

SC-5 SURE CUT Servo Knife Cutter TROUBLESHOOTING 6-17

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Conair SC-5 manual Testing Repeatability

SC-5 specifications

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