Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [startup-issues]

6 questions
11
votes
4 answers

What could prevent the start of a microcontroller?

Problem description I've got occasional startup issues on some boards with an ATmega2561. On about 10% (seems to fluctuate a lot) the processor does not seem to start on first power on. Only a power cycle lets the MCU start. I've researched online…
kruemi
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2
votes
3 answers

Voltage is below 380

I am Vango from Ethiopia. Am junior electrical engineer. While working today I've faced some problem. That is when incoming voltage drops below 380 V, I mean when it is about 370 V, motor stops immediately and it won't start again till the voltage…
Vango raggar
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1
vote
2 answers

Surge current generator to start up SMPS

I want to power supply a board (variable load 1.6 W at 24 V) from a 150 VDC source (rectified AC line) through a 2 kΩ, 20 W series resistor. Due to mechanical arrangement of the equipment the only available access is the second terminal of the 2 kΩ…
hiak
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0
votes
0 answers

SCR falsely triggered on startup (battery low current monitor)

I'm trying to build a li ion low charge current detector and cutoff circuit as a complement to my battery charging setup. Charging should be disconnected when the current reaches 400mA or below. I've started with the simplest circuit I could…
Buck8pe
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0
votes
0 answers

Orange Pi 5 power supply boot-up issue

I am a newbie using the Orange Pi 5 board, or any kind like this. I have a boot-up issue. When I connect it to the power supply, only the red light is on (on the board). I do not see anything when I connect the display by HDMI-HDMI or HDMI-TypeC. I…
Kai
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0
votes
1 answer

Is the 125VAC start capacitor preventing the 220VAC contactor coil from energizing?

The pool pump is driven by a dual voltage single phase motor (115/220VAC) with a 125VAC start capacitor (the motor is set-up for 220VAC; 220V 1P supply.) The motor is started by a 220VAC magnetic contactor (DOL,) but when the start button is pushed…
Civi
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