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Konvas KCP-1M Rheostat Motor - What switch does what??


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#1 Jian Cyrus Farhoumand

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Posted 16 October 2007 - 04:07 AM

Hi everyone,

I've recently bought a Konvas KCP-1M off eBay from the Ukraine.

Now, so far it's actually in amazing shape and running like a dream. It appears as if no-one's ever even used it once. I'm incredibly happy with it!

I do have some questions though.

I believe the current motor on it is referred to as the "rheostat", and although it's all working fine, I'm just not sure what each switch does/refers to on the top of it.

I attach a photo of the top of the motor. If you look closely you'll see that there are two switches on the top as well as a trigger off to the side.

Posted Image

Now, is there anyone here who has actually used this particular motor and can kindly advise me on this?? I know a lot of people will say "get the 15/16/17eps motor, it's better", or some such, but sadly budget and time prohibit. I'd really just like to know the EXACT functions of these switches. I've noticed that the motor doesn't always run like crystal (because it isn't crystal), and I know this behaviour is a feature of these rheostats, but I must say it is generally pretty smooth and consistant when using a fullly-charge 6V motorbike battery.

I've looked at a lot of sites that discuss the Konvas but can't find any precise diagram explaining the exact use of these switches. I'd be very grateful for anyone's knowledge on this.

Thank you.

Jian.

Edited by Jian Cyrus Farhoumand, 16 October 2007 - 04:10 AM.

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#2 Jian Cyrus Farhoumand

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Posted 20 October 2007 - 12:06 PM

Anybody know the answer?
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#3 Olex Kalynychenko

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Posted 20 October 2007 - 12:32 PM

We told about electrical motor 25M-8M of Konvas-1, KSR-1, KSR-1M ( KCP-1, KCP-1M ) cameras.
25M-8M DC motor 16 W, 6-8 v, 6..10A, with gear's reducer.
This motor with rheostat control have stator winding and rotor winding.
The stator and rotor winding can be connect ( by switches ) with rheostat by series and parallel, this is different
type of connection to change of characteristics of motor speed, power
and change of need voltage from battery : 8.5 v or 6 v.

This is circuit of motor.
[attachment=2813:scheme.gif]

A some words about use of motor.
[attachment=2814:motor_control.jpg]

You can look of disk of rheostat control (R ) with 9 marks and digitals.
The rheostat can control of speed of rotation of motor.
start-stop pin ( I ),
switch ( II ) on three positions 1, 2, 3
switch ( III ) on two positions 4, 5

We will told about control of motor with connect a power cable from battery on
motor only ( not by original power cord with two connectors on body and on motor ).

You can control of motor by a few versions :
1. by switch III and start stop pin I
2. by switch II.

1. the control of motor by switch III and start-stop pin I.
The switch II must be set at position -(1) , " 0" ( off ).
The rheostat must be set on position " 1 ".
If you need speed up to 16 fps and have normal condition of air, not less of +10 C, to have of
normal condition of battery, you need set of switch III on position (4).
The switch III connect of rheostat with rotor series, and parallel of stator winding.
You can run and stop motor, by press on pin (I) and adjust of speed by move of position of rheostat from 1 to 9.

The moving of pin ( I ) look like by two position , the first position connect rotor without rheostat and motor have maximum speed.
If you press more on pin (I), you have a second position of pin, and pin connect rotor by rheostat and you can adjusting of speed.
This is version of control use for run of camera with maximum speed at first time of shooting.


If you need speed more 16 fps, or you have low power of battery ,or you have temperature of air less of +10C,
you need set switch III on position (5).
The rheostat must be at position " 9".
The switch III connect of stator winding by rheostat series and parallel with rotor wind.
You need press on start-stop pin and motor will run.
You can adjust of speed by move of rheostat from position 9 to less.


2. The control of motor by switch II.
The start-stop pin (I) set on non press position.
The switch III can set on any position.
The rheostat must be set on position " 1 ".
The initial position of switch II - (1) - 0 - off, the motor stopped.

If you need speed up to 16 fps and have normal condition of air, not less of +10 C, to have of
normal condition of battery,
You need set of switch II from position (1) to position (3), by position ( 2).
The switch II connect of rheostat with rotor series and motor will run and you can control of speed by rheostat.
You can see, at time of set of switch on middle position ( 3) motor will have maximum speed and will have normal speed if
you set of switch on position ( 2).
This is idea use for good start of camera.
You can adjust of speed by move of position of rheostat from 1 to 9.


If you need speed more 16 fps, or you have low power of battery ,or you have temperature of air less of +10C,
you need set switch II on middle position ( 2)
The switch II connect of stator winding by rheostat series and parallel with rotor wind.
You can adjust of speed of camera by rheostat from position of 9 to less.

I think, you will need short time for study of all versions of control of motor.
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#4 Jian Cyrus Farhoumand

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Posted 20 October 2007 - 12:45 PM

Wow, thankyou Olex, that was EXACTLY the diagram I was hoping for.

Very kind of you.

And yes, haha, i think i might need some time to study and digest it all.

Cheers again,

Jian.
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