Panasonic KW8M User Manual

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Contents

KW8M Eco-POWER METER719.3 Pulse output (Transistor output) SpecificationsNumber of output point 1 pointInsulation method Optical couplerOutput type Open collectorOutput capacity 100mA 30V DCPulse width approx. 100msON state voltage drop 1.5V or lessOFF state leakage current 100μA or lessPulse output unit0.001/0.01/0.1/1/10/100kWh/Alarm(AL-P)/Current alarm(AL-C) /Stand-by alarm (AL-S) /Counter(Cnt)/Demand alarm(DEM)* (Selectable with setting mode)*Demand alarm is only for AKW8111H* We recommend the setting of minimum unit for pulse output for measurement shown as below.Output pulse: 4 pulses or less per 1sec.How to calculate(Unit for pulse output：PL-P)＞(Max. measurement power [kW])／(3600[s]×4 [pulse/s])Caution (1) Improper unit setting may cause miss counting.(2) If the OFF time is too short, there is a possibility of counting errors.*Contact output status can be checked via RS485.9.4 Communication SpecificationsInterface Conforming to RS485Protocol MEWTOCOL/MODBUS(RTU) (selectable with setting mode)Isolation status Isolated with the internal circuitNumber of connected units 99 (max.) *2 *3Transmission distance 1200m (max.) *1Transmission speed 38400/19200/9600/4800/2400bps (selectable with setting mode)TransmissionFormatData length 8bit/7bit (selectable with setting mode) * 4Parity Not available / Odd number / Even number (selectable with setting mode)Stop bit 1bit（fixed）Communication method Half-duplex (When using as a terminal, short E and －.)Synchronous system Synchronous communication methodEnding resistance approx. 120Ω(built-in)Transmission line Twisted-pair cable with shield or VCTFCommunication mode 1 : N communication*1 Please check with the actual devices when some commercial devices with RS485 interface areconnected. The number of connected devices, transmission distance, and transmission speed maybe different according to using transmission line.*2 For RS485 converter on the computer side, we recommend SI-35 and SI-35USB (from LINE EYECo.,Ltd.).*3 When using SI-35, SI-35USB or PLC from our company (which can be connected up to 99 units),up to 99 Eco-POWER METER can be connected. In case using this system with the other devices,up to 31 Eco-POWER METER can be connected.*4 With MODBUS (RTU) protocol, it works only with 8bit.