(5) Protective control
(a) Discharge pipe temperature control
If the discharge pipe temperature exceeds 105°C, compressor speed is reduced to suppress the rising of discharge pipe
temperature.
(i) If the discharge pipe temperature sensor (Tho-D1) detects 115°C or higher for 2 seconds continuously, it makes
compressor stopped. And if this anomaly occurs 5 times within 60 minute, it makes the unit anomalous stop. (E36-1)
(ii) If the discharge superheat sensor (Td-DST) detects 5degC or lower for 10 minutes continuously, it makes compressor
And if this anomaly occurs 3 times within 60 minutes, it makes the unit anomalous stop. (E44)
(b) High pressure control
(i) Compressor rotation speed protection control
①
If high pressure sensor (PSH) detects 3.70MPa or higher, it makes compressor rotaion speed decreasing.
②
If high pressure sensor (PSH) still detects 3.70MPa or higher 5 seconds after
①
control, it makes compressor
rotation speed decreasing more.
③
If high pressure sensor (PSH) detects lower than 3.70MPa, this protective control is released.
(ii) High pressure protective control
If high pressure switch (63H1) is activated or if high pressure sensor (PSH) detects 4.14MPa or higher for 10
seconds continuously, it makes compressor stopped (High pressure anomaly).
And if this anomaly occurs 5 times within 60 minute, it makes the unit anomalous stop.(E40)
(c) Low pressure control
(i) Compressor rotation speed protection control
①
If low pressure sensor (PSL) detects 0.18MPa or lower for 10 seconds continuously, it makes compressor
rotaion speed decreasing.
②
If low pressure sensor (PSL) still detects 0.18MPa or lower 30 seconds after
①
control, it makes compressor
rotation speed decreasing more.
③
If low pressure sensor (PSL) detects higher than 0.236MPa, this protective control is released.
(ii) Low pressure protective control
If low pressure sensor (PSL) detects 0.134MPa or lower for 30 seconds continuously, or if it detects 0.003MPa or
lower for 5 seconds continuously, it makes compressor stopped (Low pressure anomaly).
And if this anomaly occurs 5 times within 60 minutes, it makes the unit anomalous stop.(E49)
(d) High pressure ratio protective control
①
If pressure ratio is 8.0 or higher, it makes compressor rotaion speed decreasing.
②
If pressure ratio is 8.0 or higher 60 seconds after
①
control, it makes compressor rotation speed decreasing more.
③
If pressure ratio is 7.9 or lower, this protective control is released.
(e) Over-current protection control (Current safe)
(i) Compressor capacity control
①
Compressor speed is controlled by detecting the inverter’s T-phase current or secondary current.
②
The control is changed at every ambient air temperature zone.
[Fig. 1]
Outdoor air temperature (°C)
Current safe value (A)
A
B
C
D
3935 43 50
-
184
-
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