G'day Jim, et al
Jim I look to your comments on the current capacities of the various
control boards used in the 7x lathes. I am posting on the group
because the outcome of the discussion effects others on the group.
For my lathe this is not a concern, the KB Electronics board fitted
has capacity for motors up to 1.0HP or can supply 9 amps. KB advised
me that my 400W (180Volt) motor with full load current of 2.2 amps
can have a current limit setting of 3.5 amps
HOWEVER, other control boards may not be so generaously rated and
some recent correspondence implies that the boards are limiting the
available current to the motors. In that the motors have an
overcurrent capacity of up to 2 times the full load current it seems
unlikely to me that the SCRs on FETs would be so minimally rated that
more than full load current can be supplied. (Making gibes
about "Chinese Horse Power" is not helpful).
BTW I fitted the "correct" Horsepower resitor to my control board
last night and now have adjusted it for 3.5 amps stall current. When
the stall load is applied the current rises to 4.5 amps then
immediately swings back to 3.5 amps.
One good turn deserves another.
Regards,
Ian
