Mini UM S/M Protection ControlFunction 454. Protection Control4.1 High Pressure Protection ControlThis high pressure protection control is used to prevent the activation of protection devices dueto abnormal increase of high pressure and to protect compressors against the transientincrease of high pressure.[In cooling operation][In heating operation]Pc > 3.45MPaEvery 10 sec.Pc>3.4MPaPc<3.3MPaPc>3.6MPaKeeping the current stepEvery 60 sec. 3.3MPa≤Pc≤3.4MPaor&High pressure not limitedHigh pressure limitedINV upper limit frequency:1-step up from currentcompressor frequencyINV upper limit frequency:1-step up from currentcompressor frequencyPc: HP pressure sensor detection valueINV upper limit frequency :1-step down from currentcompressor frequencyWhen occurring 3 times within 30minutes, HPS is activated without highpressure standby, thus outputting themalfunction code "E3". (V3173)Every5 min.High pressurestandby• During oil return operation• After oil return operation• Stopping operation• Heating operation• INV upper limit frequency• Pc ≤ 3.4MPaPc>3.3MPaPc >3.6MPa52HzPc< 3.1MPaHigh pressure not limitedHigh-pressure dropPc: HP pressure sensor detection valueWhen HPS is activated, themalfunction code "E3" is output. (V3174)High pressurelimitedHigh pressurestandby
