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24
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(g)
Inching prevention
When the compressor goes into the thermo operation within 10(5) minutes since operation start or becomes various dehumidifying
operations, the operation is continued with the command speed of 20(15) rps forcibly.
Note (1) Values in ( ) are for Type 50.
(h)
Current safe
(i)
Purpose:
Current is controlled not to exceed the upper limit of the setting operation current.
(ii)
Detail of operation:
Input current to the converter is monitored with the current sensor fixed on the printed circuit board
of the outdoor unit and, if the operation current value reaches the limiting current value, the inverter speed is reduced.
If the mechanism is actuated when the speed of outdoor unit is less than 30 rps, the compressor is stopped immediately.
Operation starts again after a delay time of 3 minutes.
(i)
Current cut
(i)
Purpose:
Inverter is protected from overcurrent.
(ii)
Detail of operation:
Output current from the converter is monitored with a shunt resistor and, if the current exceeds the
setting value, the compressor is stopped immediately. Operation starts again after a delay time of 3 minutes.
(j)
Heating overload protective control
(i)
Operating conditions :
When the unit is operating with the outdoor unit speed other than 0 rps or when the outdoor air
temperature (detected by Th5) rose beyond 17ºC for 30 seconds continuously.
(ii)
Detail of operation
1)
Indoor fan speed is raised forcibly by 1 step.
2)
Taking the upper limit of control speed range at 60 rps, if the output speed obtained with the fuzzy calculation exceeds the
upper limit, the upper limit value is maintained.
3)
The outdoor fan is set on 2nd speed. (20, 25, 35 types only)
4)
The lower limit of control speed is set to 40(35) rps and even if the calculated result becomes lower than that after fuzzy
calculation, the speed is kept to 40(35) rps. However, when the thermo becomes OFF, the speed is reduced to 0 prs.
(iii) Reset conditions:
When the outdoor air temperature drops below 16ºC.
Note (1) Values in ( ) are for Type 50.
(k)
Cooling overload protective control
(i)
Operating conditions:
When the outdoor unit is operating with the speed of other than 0 rps, or when the outdoor air
temperature (detected by Th5) becomes 41ºC or over for 30 seconds continuously.
(ii)
Detail of operation
1)
Outdoor fan is stepped up by 3(1) speed step.
2)
The lower limit of control speed is set to 30 rps and even if the calculated result becomes lower than that after fuzzy
calculation, the speed is kept to 30 rps. However, when the thermo becomes OFF, the speed is reduced to 0 rps.
3)
The upper limit of control speed is 72 rps.
(iii) Restoration condition:
When the outdoor air temperature becomes 40ºC or less
Note (1) Values in ( ) are for Type 50.
(l)
Freezing cycle system protective control
(i)
Operating conditions:
When both of following conditions have continued for more than 5 minutes later than 5 minutes
after the start of operation.
1)
Command speed is higher than 60 rps
2)
During cooling, dehumidifying: Indoor heat exchanger temperature - Room temperature > – 4ºC
During heating: Indoor heat exchanger temperature - Room temperature < 6ºC
(ii)
Detail of operation
The command speed repeats 30 minutes at 30rps
↔
2 minutes at 62 rps.
(iii) Restoration conditions:
When the condition becomes outside of either conditions 1) or 2) shown above
Note (1) This control is valid when the room air temperature is in the range of 10 to 40ºC at cooling and dehumidification operation and 0 to 40ºC at heating
operation.
Summary of Contents for SRK56CE-S1
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