General Functionality Si04-11538 Main Function1.17 Compressor Protection FunctionOutline An refrigeration oil level descent and progression of the dilution which will arise at operation ofthe compressors will be avoided by controlling the upper limit of frequency at the edge ofcompressor’s changeover from OFF to ON as follows.Processing1. A choice of a constant based on the starting conditions.A constant is chosen in the following conditions at the start of compressors. In case TCG0 < TDENA type starting is adopted. In case TCG0 ≥ TDENB type starting is adopted.∗ TCG0 is set only at power-ON and then start, keep counting regardless of the operation mode.∗ The judge above should be done only at the start of compressors.∗ TCG : Timer guard for compressor protection ∗ TDEN : Elapsed time after power-on2. Frequency controlThe following control is carried out after the judge of 1. above. A constant is chosen inaccordance with A, B decided in 1). Timer TCG1 (A,B) will start at the start of compressors.The upper limit of output frequency in between TCG1 (A,B) is set at FCG1 (A,B). In exceeding TCG1 (A,B), timer TCG2 (A,B) starts and the upper limit of output frequency inbetween TCG2 (A,B) is set at FCG2(A,B). In exceeding TCG2 (A,B), timer TCG3 (A,B) starts and the upper limit of output frequency inbetween TCG3 (A,B) is set at FCG3(A,B). In exceeding TCG3 (A,B), the frequency limit is cancelled.3. Others If compressors go off at the start of this function, the timer under counting should be resetand cancelled the frequency limit. This function doesn’t work under the control of defrosting.∗ FCG : Frequency guard for compressor protection∗ TCG : Timer guard for compressor protectionSetting a constant J type Setting a constant J typeFCG1A 46 Hz TCG1A 120 secFCG1B 46 Hz TCG1B 120 secFCG2A 66 Hz TCG2A 570 secFCG2B 66 Hz TCG2B 360 secFCG3A 90 Hz TCG3A 120 secFCG3B 80 Hz TCG3B 180 secTDEN 30 minT CG3T CG2T CG1T CG0Compressor operation frequencytimeF CG1F CG2F CG3Power ON (R1907)
