Squeeling Controller, Why?
A few days ago I sent in a post on maintaining my DDE. After re-assembly I put it on test only to hear the squeel from the controller. Now squeeling usually only occurs when there is no loco on track or when it has run out of water. But this wasn't the case here. The only change I made to the loco was to put in a new wiper and its wires to the PCB. On close inspection to see if anything was amiss I noticed the motor wires were on their last strands so I re-soldered, but still no luck, it still squeeled. Hmmm, is the tender at fault? So I tested the tender coupling it up to my Seagull and everything worked, so the tender is ok. Then what has gone wrong 🥶
If anyone can shed a light on this problem I would be very grateful.
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Can you explain your term "squealing" better please. Is this the high resistance/no loco/run out of water alarm or the 10kHz high pitch noise that results from the heater PWM ?
As Markus says - check the electrical path to the heaters. If you have a DVM, the loco and the tender should each separately be about 4 ohms. When connected together, the combination should be around 2 ohms.
David