[Milsurplus] PP-4763 and Starting current

[mac]

Robert,

As I recall the TCS dynamotors run all the time (not PTT) so you might  
try a step-starting arrangement to get through initial startup turn-on  
problem.  Use a series resistor value that limits the initial surge  
current to the rated supply value and once the motors get up to speed  
short it out of the circuit.  This can be dome manually with a switch  
(try this first) or with a relay driven by a time delay or voltage  
sensing circuit.

Dennis D. W7QHO
Glendale, CA



On Dec 4, 2009, at 3:58 PM, Robert Goff wrote:

> 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
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