380V turn a drying tunnel 220V phase in mono?

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Thunderstorms
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Registration: 19/02/15, 14:12

380V turn a drying tunnel 220V phase in mono?




by Thunderstorms » 19/02/15, 14:21

Hello to you
I have a drying tunnel used for drying textile screen printing and made in China.
I wish to work at home but my home is not equipped with 380V three phase so if it is possible I want to pass it in 220V single phase.
Apparently it is possible to pass it already in 220V three-phase because the plate displays (380V / 220V)
This drying tunnel therefore has an oven with resistors, a motor for the fan and a motor for the treadmill.
I send you with some pictures.
Thanks in advance to those who will answer me :)
I specify that we only work with non-polluting water inks and organic fabrics.

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Technical parameters:
Supply power: 220 / 380V 50 / 60Hz
Power: 7kw
Load weight: 15kg
Drying cabinet size: 800 x 400mm
Machine size: 1180 x 880 x 890mm
Net weight: 87kg
Gross weight: 93kg
Packing size: 1230 x 980 x 1130mm

Characteristics:
1. The machine adopts far - infrared heating tubes arranged uniformly in the oven
2. The fan in the oven can ensure the temperature in the cabinet well, distributed
3. The machine adopts the electronic variable variable transmission, the speed of the motor is stable and adjustable, the 80cm tunnel tunnel
4. The machine can work for 5 hours, long time, low noise.
5. These are special designed and built in the market, and there are
6. The conveyor belt is stainless steel mesh belt, the other parts adopt advanced electrostatic spraying, easy to clean, no rust
7. The package is excellent, the machine is easy to transport.
8. The application is widely, and it can be applied to various products.

Operation procedures:
1. Power on, turn on the power switch, start the conveyor belt, pre-heating on 5 minutes, open the fan switch (note: when the machine is in the working state, the fan switch must be open) need of the baking content, adjust the room temperature, adjust the knob and the conveying speed, after debugging the need, it can start normal drying.
2. After the operation, turn off the heating switch, make the delivery motor and continue running 5 - 10 minutes or so, then, cut off the power supply.
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Gaston
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by Gaston » 19/02/15, 15:07

The main difficulty in three-phase -> single-phase adaptations comes from the motors.

It is possible to operate a three-phase motor with a single phase by having a capacitor between two terminals, but the power of the motor is reduced and its torque at startup even more.
Finally, this type of mounting is difficult to operate for engines over 1500 to 2000W ...

One solution would be to replace motors with single-phase motors with the same mechanical characteristics.

It is also necessary to study the equipment plan to know if the motors are connected directly to the sector or if they are controlled by an electronic device (in this case, the adaptation will also require to understand the functioning of the electronics)


Another solution is to buy a single-phase -> three-phase converter with a suitable power.
If I had to choose, I would rather move towards the latter solution.
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Thunderstorms
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by Thunderstorms » 19/02/15, 15:12

Hello,
Thank you for your reply,
actually the option of a converter seems interesting but overpriced ... since the max power is 7,5KW is fast in the 1200 euros ... unless there is cheaper ...
The new drying tunnel costs 1990 euros so ..:)
And when the plan inside there is nothing ... I opened it and no signage ...
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Gaston
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by Gaston » 19/02/15, 15:31

Storms wrote:And when the plan inside there is nothing ... I opened it and no signage ...
Without a minimum of information, it is necessary to make retro-engeneering and to follow each wire to reconstitute the diagram ...

As basic questions, I would see:
  • Power electronics (it is unlikely that the power supply used is three-phase, but it is to check)
  • Supply of heating resistors (a simple relay controlled by the electronics or a finer regulation)
  • Connection of the resistors (if they are fed between phase and neutral, no problem to pass them in single-phase, on the other hand if they are between two phases, one will lose 30% of power)
  • Power supply of the motors (according to the characteristics, that of the carpet seems with variable speed, thus not supplied directly by the three-phase).
  • Power of each motor



Does the same tunnel exist in single phase for 1990 € :?:
If so, buy one more :?
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elephant
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by elephant » 19/02/15, 15:35

At first glance, the analysis of your photos, an electrician should be able to get by: the engine is 220 V.

the three-phase 220 / 380 being 3 charges with a common neutral.

A possible pitfall being knowing that you can draw 30 amps in single phase (actually 40) (possibly at the price of a modification in your electrical panel)
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Thunderstorms
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Registration: 19/02/15, 14:12




by Thunderstorms » 19/02/15, 16:14

Thanks again for this information;

So by modifying my electrical panel it "may be" possible to have 40 Amps in single phase ...

the photo with the black label is the engine of the tunnel fan, there is also the engine running tapi but with no apparent indication ...
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The photo is vertical sorry ...
it is a small motor 12 cm long on 10 high which is located under the rolling carpet.
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picture of the box close to the map (in the photo above)
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elephant
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by elephant » 19/02/15, 18:18

It would be very surprising that this small engine is in 380 V.

Anyway, if I owned this machine, I would ask an electrician (in this case, me) or a repairer of appliances (they are used with stoves and ovens) to put his nose in , equipped with its voltmeter for certainty.

It will perform measurements at the terminals of resistors and motors and can perform a rewiring.
Warning: it will probably need high temperature son, but homeware specialists usually have.
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