User guide

Installation

Installation l 3-15

Repeatability Test Results

Results in Flywheel Mode

The display shows DevCC a full revolution of the cutter head. The reading is in

milliseconds, to the third decimal place, i.e. 0.010 is 0.01 milliseconds (or 10

microseconds). If the reading exceeds 0.200 there is a problem with the cutter

drive. If this occurs the error is too large and there is a problem in the cutter drive

that must be corrected.

Results in Timer Mode

When testing repeatability in Timer Mode, the cutter is making on-demand cuts at

a set time interval (i.e. one-second intervals). The display shows the cut-to-part

(CP) reading and the cut-to-cut (CC) reading. The reading is in milliseconds, to the

third decimal place, i.e. 0.010 is 0.01 milliseconds (or 10 microseconds).

CP is the peak time variance between the cut signal output (preset time) to the

servo amplifier, and the programmable limit switch just prior to the center of the

bushing. This is the repeatability of the cutting system to accelerate through the

part. This value is higher than the CC reading since it includes the acceleration and

deceleration contributed by the servo motor.

CC is the peak time variance between cuts. Record and compare the cut-to-cut

number to the CC value recorded in Encoder or Product Mode shows how much

error is by external influences (i.e. variation in belt puller speed, encoder mounting

problem, etc.).

If the reading exceeds 0.200, there is a problem with the cutter drive. If this occurs

the error is too large and there is a definite problem that must be corrected.

Results in Product Mode

The display shows the cut-to-part (CP) reading and the cut-to-cut (CC) reading.

The reading is in milliseconds, to the third decimal place, i.e. 0.010 is 0.01 mil-

liseconds (or 10 microseconds).

Compare the cut-to-part (CP) reading to the CP reading in the other modes. There

should be very little difference in these readings.

Compare the cut-to-cut (CC) reading to the CC reading in the other modes. Since

the Product Mode is influenced by external signals, this reading will reflect the

speed regulation of the puller.

IMPORTANT:

See Operation

Section entitled, Tuning the

Cutter

, if using Red Lion HMI

and Control Techniques/

Emerson Servo Drives