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24/05/2024

Low voltage 220V. Incinerator does not work. Troubleshooting

Greetings! Today we have a problem with the waste oil incinerator. When starting the incinerator, the touch panel displays the error “Low voltage 220V”. The incinerator is not working. What kind of error is this and how to fix it, we will try to figure it out in the article.

Incinerator control panel
Incinerator control panel

We turn to the instruction manual and see that the “Low voltage 220V” error is associated with a low voltage of 220V in the control circuit. 

Below is the “Troubleshooting list” from the manufacturer, which allows you to identify the problem and ways to solve it.

Low voltage 220V

Low voltage 220V 10%
Low voltage 220V turns off the fuel supply

The voltage drops by 10% (or more) from the normal 220V. At the same time, the multimeter did not show any voltage deviations. It is possible that the PLC protection misunderstands the operating voltage and generates this error.

Transformer 440 / 220 / 24
Transformer 440 / 220 / 24

We also pay attention to the 440 / 220 / 24 V transformer, which, using 440V of the primary winding of the power circuit, transforms the voltage into 220V and 24V of the secondary windings of the control circuit.

Touchscreen power supply
Touchscreen power supply

Before drawing a conclusion about malfunction of the PLC or its power supply, let’s connect 220V for the control circuit from another power source (in my case, from the ship’s power outlet 220V). We connect, of course, through the F8 2A circuit breaker, which is used in the circuit for a 220 volts.

The circuit works and the incinerator starts without a low voltage error. This means we conclude that the problem is in the secondary winding of the 220V transformer. The transformer is old and it is possible that it cannot withstand the current load when starting the incinerator, so it will have to be replaced.

Incinerator PLC
Incinerator PLC

We installed another transformer on the secondary 220V winding, a more powerful one, ordered the original transformer, and left the secondary 24V winding connected.

Old transformer with disconnected wires from the 220V secondary winding
Old transformer with disconnected wires from the 220V secondary winding

An old transformer with wires disconnected from the 220V secondary winding only works on 24V.

New transformer
New transformer
Breaker for a new transformer
Breaker for a new transformer

The new transformer was connected temporarily with a separate circuit breaker until the original trans arrived. The incinerator works without any problems.

Incinerator model: Kangrim KFB-32

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