F3- Compressor Out-Of-Step Error - Toyotomi KURO Mini Service Manual

(11) F3- Compressor out-of-step error

Cause: The module panel will constantly test the current of lead wires of the
compressor and calculate the position of the rotator of the compressor when
driving the compressor to work. When the compressor deviates far from the
normal operating status , it will indicate "compressor out-of-step error"
Explanation of
because the current of the compressor wires is too high or it cannot detect the
position of the rotator. This error always follows "module protection error",
error
so they have similar inspection methods.
Inspection path: supply voltage→Compressor wire, reactor wire→
System blocked→Module panel damaged→Main external control panel
destroyed→Compressor destroyed
Tools required
Multimeter, pressure gauge, module panel in normal condition
for inspection
Frequent
Supply voltage, compressor wire, reactor, system pressure, module panel,
main external control panel, compressor
problematic part
1. Is the order of compressor wires not correct, which makes the compressor
rotate reversely? Try exchanging the compressor wires on U-V phase to see if
the problem can be solved?
2. Check if the supply voltage is unstable and highly volatile, and test if the
system pressure is normal. High system pressure will cause rotating problems
to the compressor.
3. Is the module panel fixed to the radiator firmly? Will it cause pool cooling?
Is the internal and external heat exchanger dirty, which lead to poor heat
transfer and high system pressure?
4. If "compressor out-of-step error" will be indicated immediately after
starting up, it is almost certain that it's substantial error, having nothing to do
with supply voltage and system pressure, it is suggested to observe if there is
any component destroyed by strike arc near the module panel; use the
multimeter to test if the resistances between any two compressor wires are the
same. The resistances between any two compressor wires in normal condition
Inspection
are tiny resistances at ohm level and are basically equal; then use the
procedure and
megameter to measure if the resistance insulation of the three compressor
key points
wires against the earth wire is good (normally at MΩ level), and check if the
reactor wire is well connected or the reactor is destroyed. Check if the DC
voltage between P-N is too high (above 200V).
5. Test if the 15V and 5V (3.3V) power supply on the module panel is stable
and exclude the module panel error caused by power supply of the main
external control panel.
6. Replace with the module panel in normal condition for test. If the test is
normal after changing the module panel, then the original module panel is
destroyed.
7. After excluding problems of module, connecting wires, system and power
supply, distinguish by ear. If there is only electromagnetic sound and the
compressor does not work; or the sound of irregular running appears after the
compressor works for a while and then it shuts down and indicates error;
chances are that the compressor is blocked or destroyed, consider replacing
the compressor.
For the "compressor out-of-step error" and "module protection error", the
former is calculated by the main chip of the module panel and the latter is
detected by the power module itself. They are abnormal operating
Special attention
phenomenon of the compressor essentially. If there is uncertainty about either
error, analyze both together with similar method. For inverter air conditioners
that are in poor electrical environment or are old, occasional occurrence of
such errors is a normal protection.
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