Panasonic KW8M User Manual

KW8M Eco-POWER METER (1A/5ACT input type)9⑤ ④3.3 For input connection◇Input connection・Contact inputUse highly reliable metal plated contacts. Since the contact’s bounce timeleads directly to error in the count value, use contacts with as short abounce time as possible. In general, select 30Hz for max.counting speed.・Non-contact input (Transistor input)Connect with an open collector. Use the transistor with the following specifications.V CEO=20V min. IC=20mA min. ICBO=6μA maxUse transistors with a residual voltage of less than 1.5V when thetransistor is ON.*Short-circuit impedance should be less than 1kΩ.(When the impedance is 0Ω, drain current is approx. 7mA.)Open-circuit impedance should be more than 100kΩ.・Input wiringPlease wire as short as possible by using a shielded wire or a metallic electric wire tube individually.(Note)Operating power supply input part and measured voltage input are not insulated to pulse input parts.So the input equipment must have the power supply transformer in which the secondary side is notgrounded with the primary and secondary sides insulated, in order to prevent interference of thepower supply circuit when connecting the external input circuit. Be sure not to use anauto-transformer.3.4 For Output connectionSince the transistor output is insulated from the internal circuit by a photo-coupler, it can be used bothas a NPN output and PNP (equal value) output.・Wire up to 100m for output connection.If it is long, it may not work correctly due to floating capacitance of wire.⑤ ④Eco-POWERMETER(＋)(－)Insulatedtransformer Input equipment(sensor etc.)Operating power supplyMeasured voltage input(Fig.A)Good exampleEco-POWERMETER(＋)(－)Eco-POWERMETERAuto transformer(Fig.B) No Good exampleDo not ground the secondary side. Do not use an auto-transformer.Operating power supplyMeasured voltage inputOperating power supplyMeasured voltage inputInsulatedtransformer Input equipment(sensor etc.)Input equipment(sensor etc.)(＋)(－)LoadPower supply for Load-+NPN outputEco-POWER METERPulse (－)Pulse (+) PNP output-+Eco-POWER METERPower supply for LoadPulse (－)Pulse (+)6Load7 6 7