Product manual

Welding equipment
Appendix 3
Appendix3eng_Frekvenstabell.fm 65
9 Appendix 3
System accuracy: verification and trimming possibilities.
Wire feed: Feed unit A140E/A314E/A324E-L/A324E-S.
A check of the wire feed unit’s accuracy ought to be carried out by measuring the
motor tachometer’s pulse frequency and not by measuring the fed wire and time
measurement in order to avoid errors, due to wire slip and errors during starting
and stopping.
The right speed presupposes that the friction in the wire conduit system is not so
high that the wire feed regulator reaches the current limit (10A).
The frequency signal is available across terminal TB6 : 7 (5 V pulse) and 10 (0 V)
on PIB, or between terminals 13/4 (5V pulse) and 12/4 (0V) in the wire feed unit.
The measurement is appropriately carried out using a multimeter with frequency
measurement, for example, Fluke 87 or the like. If problems occur due to switch-
disturbances from the motor current a capacitor, max 0.02 µF, can be connected
across the measurement clips.
If an oscilloscope is used it should be galvanically separated from ground in order
to prevent disturbances on the tacho signal that can affect the function of the wire
feed unit.
The table below shows the relation between the frequency and wire speed.
The wire feed unit's configuration factor: 20650.
The wire feed unit's pulse amplitude: 4.5 - 5V
f = v * G * N /(pi *D * 60)
where:
f Frequency, Hz
v Wire speed, m/min.
G = 24 The gear's gear ratio
N = 60; Number of periods per turn of the motor
D = 0.037 m Feed roller's diameter (contact diameter for the welding wire.)