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Selection of transformer for cutting foamed polystyrene + connection

filip377 37857 9
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Can I use a 160 VA transformer with a 0.7 mm resistance wire for a 115 cm foam cutting machine, and what transformer, wiring, fuses, switch, and transformer type should I choose?

No, a 160 VA transformer is not suitable for a 115 cm, 0.7 mm resistance wire; the wire should run at about 17 V and 4.5 A, which is around 77 W, so a transformer of roughly 100 W with about 20 V secondary is recommended [#17063790] If you instead use 24 V with the same wire, the current rises to about 5.8 A and the power to about 140 W, which is hotter again [#17063897] Use a 2.5 mm² cable to connect the transformer to the resistance wire, put a 500 mA fuse on the primary side and a 7–10 A fuse on the secondary side, and enclose the transformer properly [#17063887] For outdoors, the flooded type is better; indoors, a standard transformer is enough [#17063887] A normal mains switch rated for 6 A is sufficient, and the built-in switch should have similar current capability because transformer inrush can stress the contacts [#17065619]
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  • #1 17063708
    filip377
    Level 8  
    Posts: 11
    Rate: 9
    Hey!
    I am in the process of collecting parts for the foam cutting machine (cutting length approx. 115 cm). I read on the internet that the right transformer would be 160VA and here I found the TMBZ 160 / 003M transformer. For this I will have a 0.7mm resistance wire connected.
    1. Will this transformer be good?
    2. Will I be able to connect it to 230v immediately or do I need anything else?
    3. What minimum wire cross-section is needed to connect it?
    4. Will the flooded or line transformer be better for my case?
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    #2 17063790
    Pyzaczek
    Level 20  
    Posts: 1029
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    With a wire length of 115 cm and a diameter of 0.7 mm, the voltage on the wire should be about 17 V. Then, the current will flow about 4.5 A, and the wire will have a temperature of about 400 degrees C. Power that will be released on the wire it is about 77 W, so this transformer is not suitable. need transformer approx. 100 W with a voltage of approx. 20 V. I don't know if 400 deg C is enough but probably yes.
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    #3 17063812
    zworys
    Level 39  
    Posts: 4117
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    Flooded it can also be networked. Only the transformer given by a colleague has 230V on the secondary side and that's too much. The power supply parameters must be calculated for a given resistance wire.
  • #4 17063835
    filip377
    Level 8  
    Posts: 11
    Rate: 9
    Thank you for your response. I made a mistake with this transformer, because I wanted to send one with primary voltage of 230 and secondary voltage, e.g. TMB 160 / 002M / 1
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    #5 17063887
    zworys
    Level 39  
    Posts: 4117
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    If it is used outdoors, it will be better flooded. In rooms enough ordinary. Both must have a housing and fuses on both primary and secondary. Connection to the resistance wire with a 2.5 mm square cable. On the primary side, a 500mA fuse is sufficient, on the secondary side from 7 to max 10A.
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    #6 17063897
    Pyzaczek
    Level 20  
    Posts: 1029
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    Rate: 109
    If you connect transformer at 24 V maintaining the previous wire parameters, the current will increase to 5.8 A, power up to 140 W and wire temperature up to 550 ° C.
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  • #7 17063934
    joon
    Level 14  
    Posts: 77
    Help: 2
    Rate: 24
    Pyzaczek wrote:
    If you connect the 24 V transformer while maintaining the previous wire parameters, the current will increase to 5.8 A, power up to 140 W and wire temperature up to 550 ° C.

    Will you reveal how you calculated it?
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  • #8 17063942
    Pyzaczek
    Level 20  
    Posts: 1029
    Help: 37
    Rate: 109
    joon wrote:
    Will you reveal how you calculated it?

    I have a resistance wire calculator.
  • #9 17065086
    filip377
    Level 8  
    Posts: 11
    Rate: 9
    Thank you all very much for your response. To sum up, with a transformer that has 230V primary voltage and 24V secondary voltage, I have to give one 500mA fuse - from the primary voltage side, and the other about 10A from the secondary voltage side. If I added a switch to this set, what minimum contact load must it have?
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    #10 17065619
    zworys
    Level 39  
    Posts: 4117
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    A standard network switch (e.g. one for a cable) with a load capacity of 6A will be more than enough. The built-in switch should also have such amperage due to the impedance and induction of the transformer (this causes the flow of larger currents during on-off switching). Theoretically, a switch of 1A would suffice, but over time the contacts will burn out during switching on and off.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around selecting an appropriate transformer for a foam cutting machine with a cutting length of approximately 115 cm and a resistance wire diameter of 0.7 mm. The initial suggestion of a TMBZ 160 / 003M transformer with a 160VA rating was deemed unsuitable due to insufficient power output, as calculations indicated a need for a transformer capable of delivering around 100W at approximately 20V. A transformer with a primary voltage of 230V and a secondary voltage of 24V was recommended, along with the necessity of using a 500mA fuse on the primary side and a 10A fuse on the secondary side. The discussion also highlighted the importance of using a 2.5 mm² wire for connections and suggested that a standard network switch rated for 6A would suffice for the setup. The choice between a flooded or line transformer was also addressed, with flooded transformers being preferred for outdoor use.
AI summary based on the discussion. May contain errors.
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