Panasonic LH2H Manual

Also see for LH2H preset: Specifications Manual Quick start guide

LH2H127Operation modeOperation mode Explanation Time chartTotalizing ON delay• Elapsed value does not clear at power ON.(Power outage countermeasure function)• The output remains ON even after thepower is OFF and restarted.Signal ON delay• Clears elapsed value at power ON.• Time delay starts at start ON and outputresets at start OFF.• Time delay starts at reset OFF and powerON while start is ON.Signal Flicker• Clears elapsed value at power ON.• Time delay starts at start ON.• After timer completion, control outputreverses, elapsed value clears, and timedelay starts.• Ignores start input during time delay.Pulse ON delay• Clears elapsed value at power ON.• Time delay starts at start ON.• After timer completion, control output isON.• Ignores start input during time delay.GStartResetOutputPower supplyT>tatat2t1TT=t1+t2OFFONOFFONOFFONOFFONBStartResetOutputPower supplyT TOFFONOFFONOFFONOFFONFStartResetOutputPower supplyT>tataT T TOFFONOFFONOFFONOFFONEStartResetOutputPower supplyTTTOFFONOFFONOFFONOFFONCautions for use1. Input and output connection1) Input connection(1) Contact inputUse highly reliable metal plated contacts.Since the contact’s bounce time leadsdirectly to error in the timer operating time,use contacts with as short a bounce timeas possible.(2) Non-contact input (Transistor input)Connect with an open collector. Usetransistors whose characteristics satisfythe criteria given below.VCEO = Min. 20 VIC = Min. 20 mAICBO = Max. 6 μAAlso, use transistors with a residualvoltage of less than 2 V when thetransistor is on.* The short-circuit impedance should be lessthan 1 kΩ.(When the impedance is 0 Ω, the currentcoming from the start input terminal isapproximately 5 mA and from the resetinput terminal is approximately 1.5 mA.)Also, the open-circuit impedance shouldbe more than 100 kΩ.(3) Input wiringWhen wiring, use shielded wires ormetallic wire tubes, and keep the wirelengths as short as possible.2) Output connectionSince the transistor output of hour meteris insulated from the internal circuitry by aphoto-coupler, it can be used as an NPNoutput or PNP (equal value) output.As NPN outputAs PNP output3 41 2 56ResetinputStartinput3 41 2 ResetinputStartinput563 41 2 56LoadLoad’s powersupply3 41 2 56LoadLoad’s powersupply2. Self-diagnosis functionIf a malfunction occurs, one of the following displays will appear.* Includes the possibility that the EEP-ROM’s life has expired.3. Power failure memoryThe EEP-ROM is overwriting with the following timing.Display Contents OutputconditionRestorationprocedurePreset values afterrestorationErr-00 MalfunctioningCPU OFFEnter frontreset key orrestart hourmeterPreset value atstart-up before theCPU malfunctionoccurredErr-01 Malfunctioningmemory* 0Operation mode Overwrite timingG (Totalizing ON delay)modeChange of preset value or when power isOFF after start and reset input turns ONOther modes When power is OFF after changing presetvalue4. Terminal connection1) When wiring the terminals, refer to the terminal layout andwiring diagrams and be sure to perform the wiring properlywithout errors.2) After turning the hour meter off, make sure that any resultinginduced voltage or residual voltage is not applied to power supplyterminals (1) through (2). (If the power supply wire is wiredparallel to the high voltage wire or power wire, an induced voltagemay be generated at the power supply terminal.)3) Have the power supply voltage pass through a switch or relayso that it is applied at one time.

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