On 23/07/2020 14:10, Paul wrote:
wrote:
On Wednesday, 22 July 2020 21:14:05 UTC+1, WingnutsÂ* wrote:
replying to The Medway Handyman, Wingnuts wrote:
Hi, I have a Henry NVR200 which is over heating.

I've stripped it down and cleaned it as best I can..Â* The brushed
have about
15mm left on them and the fans underneath the motor were pretty clean
but I
soaked them in warm soapy water nonetheless and then used a bottle
brush to
get in-between them.Â* I then attached a drill to the nut and ensuring
the
correct direction I spun it up to dry out any moisture that remained,
if any.

The lack of obvious fluff and dirt and that it was pretty clean in
the first
place bothered me; I was expecting something more significant to
explain the
tripping of the thermal cut-out.Â* I cleaned everything and
re-assembled Henry.

There was a noticeable improvement in the suction and the motor
didn't trip
out...... until just now.

So, before I strip it down again, could the thermal cut-out be
faulty?Â* I'm
guessing it's unlikely as Henry runs for a short time before it cuts
out, then
it starts up again.Â* I'm guessing this is due to the thermal cut-out
cooling
slightly etc etc.

Does anyone have any advise on troubleshooting the actual cause or a
process
of elimination I should follow?

I know this post is over 10 years old, but I have faith in you lot

Thanks in advance,

I'd check its idle current and/or lube the bearings.
Used vacs also benefit from clearing the airpath out &
cleaning/replacing filters.


NT

http://www.wobblycogs.co.uk/electron...c-henry-motor/


Â*Â*Â* "Start by simply giving the motor a good visual inspection. If the
insulation
Â*Â*Â*Â* in the windings has failed youll likely see sooty burn marks
somewhere on
Â*Â*Â*Â* either the stator or the rotor. The most common location for a
failure is
Â*Â*Â*Â* just under the commutator (the divided copper area the brushes run
on)."

Using your Kill-O-Watt meter, the vacuum power consumption is
likely way out of line with reality.

Without any special prep, I just checked my vacuum cleaner.

Nameplate rating:Â*Â*Â*Â* 7.4 amps
Test (tube open):Â*Â*Â*Â* 6.2 amps (bag is full though)
Test (tube closed):Â*Â* 6.8 amps

I was expecting a lower reading, but I guess the full
bag is doing that to the power.

And the meter has trouble measuring the power,
because motors like that one run dirty. There would
be a lot of sparks coming off that commutator
and brush assembly.

But at least the power footprint, is less than the nameplate.

Â*Â* Paul


My Henry gives on a cheap no-name plug in power meter ......

Rating 1200W max, 1000W IEC

High setting
Tube open 1200W
Tube closed 850W

Low setting
Tube open 770W
Tubw closed 580W

Same results (giveor take 20W) when removing the flexi tube and just
open/closing Henry's nose opening


Fairly new HepaFlo bag fitted which is possibly only 5% full.

The power taken appears to go down when the tube is blocked.




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