Daikin J Series Service Manual download pdf (Page 99)

System control SiE18-201

88 Main Functions

3.16.2 Input Current Control II (High Pressure Control)

Outline Based on the input current and input voltage, the compressor output frequency is regulated to

decrease the compressor capacity in order to prevent abnormal rising of the high pressure.

Note The peak-cut control is similar to this function, but it cannot effectively detect high pressure

during transitional condition due to the thermistor's tracing performance; therefore, the high

pressure can increase abnormally in some cases. This function droops the compressor when a

transitional condition occurs or the high pressure rises suddenly in order to prevent abnormal

rising of the high pressure.

Therefore, the function start area is set higher that the high pressure setting of the peak-cut

control.

The high pressure saturation temperature is estimated from the power consumption (input

voltage, input current), output frequency and suction pressure, and three zones (reset, no-

change and drooping zones). When the high pressure saturation temperature is in one of the

zone, the output frequency limit is varied depending on the type of the zone.

Details The high pressure is estimated based on the high pressure estimation function (operating

frequency, input current, suction pressure), and the estimated high pressure is used to obtain

the saturation temperature. When the heat exchanger intermediate temperature enters the

overcooling zone, if the peak-cut control does not function, this function prevents abnormal

rising of the high pressure.

Cooling

Heating

A change of 2 Hz is made when each zone fluctuates.

The reset zone is set for 30 sec when compressor operation is started, for 30 sec when the

number of operating room units increase, and for 2 sec when the number of operating room

units decrease.

With each operation of the HPS operation counter, the zone judgement temperature is

decreased by 2˚C.

Drooping speed : 2Hz/40sec

Reset zone

No-change zone

Drooping zone

58˚C

60˚C

62˚C

Target temperature

of liquid pipe

temperature rise

in cooling SC

control : 60˚C

(M1023)

Drooping speed : 2Hz/40sec

Reset zone

No-change zone

Drooping zone

56˚C

58˚C

60˚C

(M1024)

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Daikin J Series Service Manual Page 99

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