Control Functions - Hitachi SAMURAI Series Service Manual

2 Control Functions

Index
2.1 Control functions on the module.............................................................................................................. 6
2.1.1 Water control ................................................................................................................................................... 9
2.1.2 Water temperature control ............................................................................................................................. 10
2.1.3 Compressor Control ...................................................................................................................................... 13
2.1.4 Control for recovery from power interruption (Option) ................................................................................... 15
2.1.5 Prevention of simultaneous startup ............................................................................................................... 16
2.1.6 Reverse prevention control ........................................................................................................................... 16
2.1.7 Control for prevention of wrong operation and wrong settings ...................................................................... 17
2.1.8 Demand control ............................................................................................................................................. 17
2.1.9 Forced load up capacity control from external signal .................................................................................... 21
2.1.10 2-temperature setting function ..................................................................................................................... 22
2.1.11 External thermo operation from external contact ......................................................................................... 23
2.1.12 Water Temperature of the Control Target .................................................................................................... 25
2.1.13 Operation from DC24V contact input .......................................................................................................... 26
2.1.14 Thermo OFF function selection ................................................................................................................... 31
2.1.15 Selection of enabling/disabling of alarm release by means of remote stop ................................................ 32
2.1.16 Limitation setting for pump feedback waiting time ....................................................................................... 33
2.1.17 Inlet water temperature thermo OFF function ............................................................................................. 34
2.2 Control of the cooling cycle ................................................................................................................... 36
2.2.1 Compressor Control ...................................................................................................................................... 36
2.2.2 Expansion Valve Control ............................................................................................................................... 37
2.2.3 Overcurrent protection control ....................................................................................................................... 39
2.3 Control of Master/Slave group............................................................................................................... 40
2.3.1 Summary of control of Master/Slave group ................................................................................................... 40
2.3.2 Setting method .............................................................................................................................................. 40
2.3.3 Operation method .......................................................................................................................................... 41
2.3.4 Other functions of the control of Master/Slave group .................................................................................... 43
2.3.5 Setting items .................................................................................................................................................. 44
2.3.6 Method for setting and confirmation of operation conditions through the LCD screen .................................. 46
2.4 Run operation ........................................................................................................................................ 48
2.4.1 Setting of switches on the setting PCB ......................................................................................................... 48
2.4.2 Operation control of the module .................................................................................................................... 49
2.5 Time chart ............................................................................................................................................. 50
5 SMGB0120 rev.0 - 11/2017
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C o n t r o l F u n c t i o n s
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