System control Si18-201
136 Main Functions
3.18 Electric Parts Cooling and Electric Parts / Fin
Temperature Control
Outline This function cools the electric parts (outside fan ON control) and turns off the inverter to
prevent excessive heating that can cause malfunctions of the electric parts and reduces their
service life.
Details Fin temperature Hz drooping function
Based on the fin temperature detected by the inverter microcomputer, this function prevents
generation of inverter stop processing when the fin temperature rises.
A change of 2 Hz is made when each zone fluctuates.
With each operation of the fin temperature abnormal operation counter, the zone judgement
temperature is decreased by 2°C.
Fan control during electric parts cooling
With the compressor turned off (not in pressure equalization control), when box (electrical box)
temperature DTR
≥
75°C, the top fan rotation is set to 775 rpm and the bottom fan to 715 rpm
for the cooling of the electric parts.
When box (electrical box) temperature DTR < 70°C, the outside fans are turned off.
Drooping speed : 2Hz/30sec
Reset zone
No-change zone
Drooping zone
86˚C
87˚C
88˚C
(M1026)
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