[Milsurplus] PP-4763 and Starting current

[Richard Brunner]

Very high starting current is a common problem with dc motors.
Commercial practice is to use resistive starting on motors over about
1/2 hp.  Use just enough series resistance to allow the motor (or
dynamotor) to start, then short it out when the motor starts.  Starting
current falls rapidly when the motor starts turning.  Starting current
only 10 times FLA is optimistic.

Richard, AA1P

> > A question for the group:
> >
> > I'd like to use the PP-4763 to run a 24V TCS Motor-generator set.  The
> > set has two 24V 1/3 horsepower motors rated together at 17A FLC.  The
> > stock PS won't start even one motor.
> >
> > Has anyone had any luck disabling the current limiter (crowbar)
> > circuit in the  power supply?
> >
> > Adding two tractor batteries in series across the power supply gave me
> > enough capacity to start the receiver motor, but when I flip the
> > switch for the transmitter, the PS current limiter still trips and
> > shuts the whole thing down.
> >
> > I realize that LRC could easily be ten times the 17A listed for the
> > two motors, but it seems that any large dynamotor (such as the HV dyno
> > in the T-195) would have similar characteristics.
> >
> > Anyone had similar problems?
> >
> > Thanks,
> > Robert
> > W7MKA