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McElroy Fusion Discussion
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PostPosted: November 24th, 2014, 3:51 pm 
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Joined: September 29th, 2009, 2:45 pm
Posts: 239
Have a T900 SN C19776 that blows both F61 & F62 buss fuses (250V 2amp) when RTD is plugged into the Pivot Arm Juntion Box. If RTD is not plugged in, it will not blow them. please point me to the right direction. i been using drawing number T9035501
Thankyou
CISCO
Fmoreta@consolidatedpipe.com


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PostPosted: November 26th, 2014, 3:48 am 
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Joined: June 17th, 2007, 12:23 am
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Location: Brisbane, Australia
I will let MMI reply to the longer but 100% way of checking this but history tells me to look at the heater coil. Check your resistance from A1 and A2 on the coil once you remove the wires. I don’t recall the reading of a good coil but if have a good coil to compare it to,,,,. If the RTD is unplugged then the coil will not get the power it needs to pull in so this would stand to reason. I would still suggest following the proper troubleshooting techniques


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PostPosted: November 26th, 2014, 11:03 pm 
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Joined: June 17th, 2007, 12:23 am
Posts: 125
Location: Brisbane, Australia
I found a known bad coil and its measures 1.5 ohms of resistance where a good coil should read much higher


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PostPosted: December 1st, 2014, 2:45 pm 
Correct. If the resistance of the coil is low, it will blow those fuses. Without the RTD, the heater contactor won't activate and thus won't blow the fuses.

Double check your frequency. This is the usual suspect when coils are blowing.


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