12-11
CONTROL SYSTEM
SM OU12HP 2-E.2 GB
12.5.9 Thermodynamic Protections
12.5.9.1 Protection level definition
Five protection levels are defined:
Normal – No protection status.
Stop-Rise (SR) – Compressor not allowed raise speed.
D1 - Compressor speed reduced.
D2 - Compressor speed reduced rapidly.
Stop-Compressor (SC) – Compressor stops.
12.5.9.2 IDU Protections
ICT Value ICT Trend
Indoor Coil
Defrost
Protection
Indoor Coil
Over Heating
Protection
Fast
Increasing
Increasing No change Decreasing
Fast
Decreasing
ICT < -2 ICT > 62 SC SC SC SC SC
-2 ICT < 0 60 < ICT 62 D1 D1 D2 D2 D2
0 ICT < 2 55 < ICT 60 SR SR D1 D2 D2
2 ICT < 4 53 < ICT 55 SR SR SR D1 D2
4 ICT < 6 51 < ICT 53 Normal Normal SR SR D1
6 ICT < 8 49 < ICT 51 Normal Normal Normal SR SR
8 ICT ICT 49 Normal
Operation logic of all protections is the same. The controlled input (CTT, HST, ACC, DCC) is
controlled by changing the protection level using the fuzzy logic algorithm according the input
level and the change rate.
The following table summarizes the basic levels of each protection:
Protection
level
Compressor Overheat
(CTT)
Compressor AC
Over current (ACC)
Compressor DC
Over current (DCC)
Heat Sink
(HST)
SC 95 25.0 22.0 90
D2 92 24.6 21.4 87
D1 90 24.2 20.8 85
SR 87 23.6 20.0 83
Normal 78
There are two sets of ACC values, the selection of the values are set according to the state of
the Power-Shed dry contact input.
Power-Shed input open ACC
Power-Shed input short PSOC
12.5.9.3 Total Protection Level Definition
The total protection level is defined by the higher level of protection received.
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