F1 -Module Protection Error - Toyotomi KURO Mini Service Manual

(9) F1 -Module protection error

Cause: The power module is the part to directly drive the compressor
to work. It can protect the machine in time when overcurrent,
overvoltage or overheat occurs and stops the compressor from
working. It will, at the same time, send "shutdown request" to the
Explanation of
module panel. The error triggered by the "shutdown request" is called
error
"module protection error".
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, megameter, module panel in normal
for inspection condition
Frequent Supply voltage, compressor wire, reactor, system pressure, module
problematic part panel, main external control panel, compressor
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 "module protection 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 are tiny
resistances at ohm level and are basically equal; then use the megameter to
measure if the resistance insulation of the three compressor wires against the
earth wire is good (normally at MΩ level), and check if the reactor wire is
Inspection
well connected or the reactor is destroyed.
procedure and
5. Test if the 15V and 5V (3.3V) power supply on the module panel is stable
key points
and exclude the module panel error caused by power supply of the main
external control panel.
6. Methods for judging whether the power module is damaged: use the "diode
position" of the multimeter to measure the features of P of the module panel
against U-V-W three phases respectively. Measure the power module P-U,
P-V and P-W, there is always infinite resistance at one side and fixed on-state
voltage at the other side (generally 0.5V); measure the features between N-U,
N-V and N-W in the same way, if short circuit occurs during any
measurement, then the module is destroyed.
7. 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.
8. 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.
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