[bluezone]

Hi

I think its closer to zero , the pots only turn about 270 degrees

John

Ok. have printed them images out so all set for the morning.

[john-100]

one more picture

John

[bluezone]

one more picture

John

Thanks that makes it easyer.

[bluezone]

Forgot to ask.

Is the chuck spinning the right way?

On both videos I start off with the switch in forward and then 1/2 way i change it over.

[john-100]

Yes thats correct

looking from the tail stock to the chuck

normally the work piece rotates anti clockwise

so a spot on the top arcs down onto the cutting tool

John

[Al_The_Man]

If you still feel you are not getting max RPM. check for 10v between the external speed pot P1 P2.
Also check at the motor terminals for min 90vdc. if running on 12vac supply.
Al.

[bluezone]

Just set all the pots the details below. Machine dont spin at all.

Oh and yes the power cable is plugged it. lol. 1st thing i checked.

[john-100]

First thought --- the "accel" preset was fully anticlockwise because its faulty ?

measure the voltage between P3 and P1 any thing from 7 to 10 volts or so will be OK

then check when you turn the speed up and down you see 0 to 10v max
between P1 and P2

then if you measure between I1 and I2 you have the same after a delay

note I2 has a wire with the small push on connector on it

the voltage across C101 controls the speed




John

[bluezone]

Getting tricky now.

I have a digital multimeter. this is the one i have.
Digital Multimeter VC890C+ Sales, Buy Digital Multimeter VC890C+ Products from alibaba.com

I cant work off that types of drawing. Sorry dont know must about electrics apart from computer stuff.

[john-100]

HI Bluezone

try this with the meter set to 20V dc range

set the MIN preset fully anticlockwise and connect the
meter common to P1

with the red wire plugged into V/ ohm

1, the voltage on P1 is about 0 to + 0.5 V

2, the voltage on P3 is + 5.6V ( with MAX preset at 60% of its resistance {0.6 x 10K})

3, the voltage on P2 varies between the two readings above

4, the voltage on I1 is similar to P2 but takes a few seconds
to increase ( depends on ACCEL setting)
it is the voltage that controls the speed


John

[bluezone]

YIP. Try this with the meter set to 20V dc range

YIP. Set the MIN preset fully anticlockwise and connect the
meter common to P1

Your lost me on this next part. With the red wire plugged into V/ ohm

1, the voltage on P1 is about 0 to + 0.5 V

2, the voltage on P3 is + 5.6V ( with MAX preset at 60% of its resistance {0.6 x 10K})

3, the voltage on P2 varies between the two readings above

4, the voltage on I1 is similar to P2 but takes a few seconds
to increase ( depends on ACCEL setting)
it is the voltage that controls the speed

Whats the P1, P2, P3 ?

[john-100]

P1 , P2 and P3 are the three connections to the speed control potentiometer

P2 is the moving connection in the middle

P1 the negative end that the wiper moves to when you reduce the speed

P3 the positive end

I2 and P1 should be at more or less the same voltage
originally I intended for you to measure with the meter common conected to I2 but decided P1
would be easier and almost the same

if the ACCEL preset is open circuit you will not have the control voltage between P1 and I1


remember ,while the maximum voltage between them is about 12V DC
they are LIVE as I2 is connected to mains via the negative side of the bridge rectifier


John




PS can you hear the relay switch ?
if not the fuse may of blown

if all else fails put the presets back to the original positions
as in your picture

the only other thing I can think of is if there is a problem with
the current limit CL preset

[bluezone]

Ok, Think I got it right.

Black on P1 - Red on P3 = 5.7 to 6.0v it moved up to 6.0v and stayed there. (With speed knob off and switch on forward)

Black on P1 - Red on P2 (Switched in forward and turning speed up from off to max) = 0v to 5.7v

Black on P1 - Red on P2 (Switched in reverse and turning speed up from off to max) = 0v to 4.14v

Number 3 on your list I wasnt to sure about. Do I leave Black wire on P1 and put red on I1 and then what?

This is with all the pots set to the details below apart from the min pot set to lowest.

Thanks.

P.S Relay is clicking over and fuse is fine.

[john-100]

Hi

a windows update got in the way !

with the black lead on P1 and red on I1

you should be able get a similar reading
as you had between P1 and P2

but the voltage will take a second or two
to follow an increase as you turn the speed up
depending on the ACCEL preset position

if this voltage is verry low or missing
turn the ACCEL preset fully anti clock wise
as it was originally and see if this now works

if it does the preset may need replacing
I'll have a look at the circuit in the morning



john

[Al_The_Man]

When it was pulsing, did you happen to see if the CL, current limit led was lighting briefly?
Also you mentioned that the board was new but maybe not hooked up, although I have never found much difference at set up time, does it have the right plug-in current detect resistor, for your motor it looks like it should be .05ohms?
Al.

[bluezone]

Black on P1 - Red on I1 accel pot set at 50% = 0v to 0.03v Lathe not spinning

Black on P1 - Red on I1 accel pot set at 0% = 0v to 0.70v Lathe spinning very slow like in 1st test video I did.

No lights/LED's flashing. I dont even think it has any on it that I can see.

[john-100]

HI Bluezone ,

A bit later than I expected (its 10:40AM here)

looking at your photo of the board the LED and resistor marked R44
has not been fitted thats why you don't see a flashing light
( i don't see the holes in the board for the resistors wires ! )

what do you have if you measure the voltage between I1 and I2

you can disconnect the wire connected to I2 if you need to
its part of the circuit to reduce the speed in reverse

what is the resistance printed on the large plug in resistor?

its value will affect the IR setting and the voltage around the I1
connection point

John

[bluezone]

Will have a look at it in the morning.

Has on it: Will have another look at it tomorrow as thats all i can remember seeing on it

1 120v
1/8 - 1/6

Its 11.35pm here at moment.

[john-100]

Hi

that could be the problem

I'll have to double check

but that works out to a 1/4 horse power motor if your mains is 240V

1 HP is about 750W

this makes the resistor twice the resistance i'd expect for a 350 W 220v DC motor ?

I thought it should be 0.05 ohms 5W

the IR comp is a positive feed back of the voltage across the HP resistor
and if you over compansate that will explaine the plusing of the motor


John

just looked back at the earlier posts and your motor is 180V DC 400W

so you want the 240V ac mains , 1/2 horse power option

0.05 ohms 5W = KB electronics part number 9839

[bluezone]

Yeh stickers on motor are:

83ZYT001 180VDC 400W
Aslo a earth sticker.

Yes (NZ) New Zealand is 230/240 volts (50 hertz)

Is the resistor a easy part to get? Im i going to have to import one?