PA Industries MINI Servo Roll Feed SRF-105M through SRF-320 - Manual (Page 3)

Form 1145 Mini Installation Form and Operation Manual 02/02/2006
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1. INTRODUCTION
The P/A Industries Mini Servo Roll Feed is a state of the art AC Servo feed, which eases operator adjustments to feed
pitch, speed, and acceleration. These operator adjustments are entered into the control memory by keypad input. With
the use of a positional limit switch, the press signals the feeder when to begin moving the strip. The operating speed of
the press should be set to provide adequate time for the index to be completed while the die is open.
The mechanical simplicity, accuracy, and ease of use of the Mini Servo Roll Feed should help to improve your quality
and production for years to come.
2. HOW A SERVO FEED OPERATES
The Mini Servo Roll Feed consists of:
1) Mechanical assembly
2) Servomotor
3) Servo Control
The servo control acts as the central processor for the Mini Servo Roll Feed. Feed parameters entered into the servo
control are processed to position the servomotor. Calibration of the motor encoder to the feed roll circumference
allows accurate positioning of the feed roll. Each revolution of the servomotor produces 8000 encoder pulses. Every
2.857 revolutions of the servo motor shaft produce 1 revolution of the feed rollers. The circumference of the lower roll
is approximately 5.566 inches.
When a new feed pitch is entered into the system, the built-in computer calculates the correct number of electronic
“pulses” it must receive from the motor mounted encoder in order to rotate the feed rolls the correct distance.
Example: If a feed pitch/length of 5.566 inches is entered into the feeder, this will result in exactly one revolution of
the feed rolls. The motor will accelerate and turn 2.857 turns. This will produce (2.857 x 8000 = 22,856) pulses of
the encoder. The feeder will decelerate and stop when 22,856 pulses are detected. The feeder is now on position. The
MECHANICAL PILOT
RELEASE ACTUATOR
CONTROL
ENCLOSURE
ADJUSTABLE
MOUNTING
BRACKET
DATA
TERMINAL
CABLES
Figure 1