Fujitsu AIRSTAGE J-IIIL Design & Technical Manual

¢ Electrical wiring• Electricity meter connection compositionTo perform energy saving peak cut control, basically, electricity meters with pulse transmissionfunction measuring all the power consumed by the air conditioner are necessary. Multiple metersinstallations are also possible as long as the number of electricity meters is within the specifiedlimit. A general electricity meter installation configuration is shown below.InternetPulse unitreference pointmeasurementlinemeasurementlinePulse constantreference pointPulse constantreferencepointpulsetransmissionlinePulse transmission lineCTVT(PT)3ø or 1ø1øVT(PT)System controllerTouch panelcontrollerSystem controller(Remote site)Transmission line (VRF network)Outdoor unitIndoor unitto CN135Power cableElectricity meterElectricity meterLocally purchased parts▪Electricity meter▪CT▪VT (PT)Item DescriptionElectricity meterMeasures the voltage and current of the power cable to which measurement line isconnected and finds the power consumption from these. In addition, pulsescorresponding to the measured value are output to the transmission line.Voltage Transformer(VT) Transform the power source voltage to a measurable voltage. Transformation ratio isindicated by VT (PT) ratio. Normally unnecessary for the voltage value level used byoutdoor units and indoor units.Power Transformer(PT)Current Transformer(CT)Transform the power line current value to a current measurable by an electricitymeter. Transformation ratio is indicated by CT ratio. There are types which is insertedbetween power cables and types which are coupled to the power cables.Pulse unitPulse unit indicates the relationship between electricity meter output pulse andmeasured power. The value specified in pulse unit indicates the power in kWhconsumed on the power cable for 1 pulse.Units: kWh/pulseThe value specified by pulse unit takes into account the VT and CT ratio used andcorresponds to the actual power consumption itself.Pulse unit referencepoint Indicates the measurement point of the power consumption specified in pulse units.Pulse constantPulse constant indicates the relationship between electricity meter measured powerand output pulses. The value specified by pulse constant indicates how many pulsesare equivalent to 1 kWh of power consumption input to an electricity meter.Units: pulse/kWhBecause the ratio of VT and CT used is not taken into account in the value specifiedby pulse constant, to find the actual power consumption on the power cable, thepulse constant value must be multiplied by both the VT and CT ratio.Pulse constantreference point Indicates the measurement point of power consumption specified by pulse constant.• Selection of Electricity meter, CT, and VTSelect the electricity meter, CT, and VT by considering the following items:– Install electricity meters for each refrigerant system, if circumstances allow.– Select VT/CT with a small VT/CT ratio.– When using an electricity meter which is specified in pulse units (kWh/pulse), usually select ameter with a 1 kWh/pulse output.2-26. Electricity charge apportionment setting (System controller, Touch panelcontroller)- (07-138) - 2. Function settingsFUNCTIONSETTINGSFUNCTIONSETTINGS