[GreenKeys] Powering Series (Governed) Motors (LMU6)

[John Spigel]

Paul, Page 2 of the manual in the B295B link states that the LMU6 
assembly is for use with AC. It likely will not be suitable for DC with 
the peripheral items provided with it. So 50/60 CPS is good. I would 
check for leakage and ground the base for safety. The targets on the fan 
allow various ways to adjust speed.
73, John W1AN


On 02-Jan-24 14:07, pbirkel at gmail.com wrote:
>
> As related in another thread I have acquired a BRPE21 with a governed 
> LMU6 motor unit.
>
> The motor plate states: 5PA66HV2A / Type: PA / V: 115 / CY: 60/50 / 
> WD: SERIES
>
> Bulletin 295B “Technical Manual for Motor Units” 
> (https://www.navy-radio.com/manuals/tty/295B-6504.pdf) states that the 
> LMU6 series (governed) motor is AC/DC.  I infer that if I simply 
> supply 120VAC 60Hz the governing components/circuitry will have no 
> adverse effect, but that’s not made clear anywhere.  The curved-blade 
> power socket seems to suggest that this installation was intended for 
> DC operation, so I’m reticent to simply supply AC “and see what 
> happens”.  (Shaft turns freely and depressing the four spring-ball 
> oiling ports appears to indicate the presence of sufficient 
> light-weight oil, so other than modest cleaning the motor assembly 
> appears to be ready-to-go.)
>
> In the TM, Figure 5 “Typical Series (Governed) Motor Unit Schematic 
> Diagram” (PDF page 16 of 52) is the applicable schematic; there’s no 
> indication of polarization at the LINE connection.  Is this correct 
> for 115 VDC operation (either orientation is fine)?
>
> Can I simply power the LMU6 with 60 Hz, 120 VAC without any changes?
>
> - paul
>
>
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