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Fix the shorter heat press #369

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amcewen opened this issue Oct 24, 2016 · 4 comments

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@amcewen
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commented Oct 24, 2016

We've been given two heat presses but neither of them work. One to fix and keep, one to fix and return.

This issue is to track the problems and fixes for the shorter of the two. Fixing the taller one is being tracked in issue #368.

It would be really good if we could get at least one of them working before Sat 29th Oct 2016 so it can be used at the Make:Shift:Do open day.

@paulgeering

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commented Jan 6, 2017

PART REQUIRED
Inspection and testing has shown this to be a failed relay.

Relay part number:
JQX-105F-4 012D-1HS (Datasheet)

Current Rating: 30A
Coil Voltage: 12vdc
Coil Terminal Width:2.8mm
Contact Arrangement: 1Form A
Construction: Plastic Sealed

Steps During Testing:
0. Noted that Temperature readout showing room temp.

  1. Check resistance of element - OK
  2. Check output of controller at relay - OK
    (12vdc present when controller trying to heat the press)
  3. Bridge output terminals of relay - OK
    (Element began heating press, Thermocouple reporting temp to controller, Temp readout seems sensible)
@amcewen

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commented Jan 6, 2017

I've ordered one from RS (http://uk.rs-online.com/web/p/non-latching-relays/1218070/). I expect it'll be here on Monday.

@amcewen

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commented Jan 10, 2017

The part arrived today, and is tucked into the handle of the heat press (in a white paper bag) ready for fitting.

@paulgeering

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commented Jan 13, 2017

New relay fitted and press run up to operating temp.

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