Panasonic LT4H/-L Manual 

Also see for LT4H: Specifications

Contents

specifications

471. Terminal wiring1) When wiring the terminals, refer to theterminal layout and wiring diagrams andbe sure to perform the wiring properlywithout errors.2) When using the instrument with anflush mounting, the screw-down terminaltype is recommended. For the pin type,use either the rear terminal block(AT78041) or the 8P cap (AD8-RC) forthe 8-pin type, and the rear terminalblock (AT78051) or the 11P cap (AT8-DP11) for the 11-pin type. Avoid solder-ing directly to the round pins on the unit.When using the instrument with a frontpanel installation, use the DIN rail termi-nal block (AT8-DF8K) for the 8-pin typeand the DIN rail terminal block (AT8-DF11K) for the 11-pin type.3) After turning the unit off, make surethat any resulting induced voltage orresidual voltage is not applied to powersupply terminals W through U (8-pintype) W through P (11-pin type) orand (screw terminal type). (If thepower supply wire is wired parallel to thehigh voltage wire or power wire, aninduced voltage may be generatedbetween the power supply terminals.)4) Have the power supply voltage passthrough a switch or relay so that it isapplied at one time. If the power supplyis applied gradually, the counting maymalfunction regardless of the settings,the power supply reset may not function,or other such unpredictable occurrencemay result.2. Input connectionsThe power circuit has no transformer(power and input terminals are not insu-lated). When an input signal is fed to twoor more timers at once, do not arrangethe power circuit in an independent way.If the timer is powered on and off inde-pendently as shown in Fig. A, the timer'sinternal circuitry may get damaged.Becareful never to allow such circuitry.(Figs. A, B and C show the circuitry forthe 11-pin type.)21If independent power circuitry must beused, keep the input contacts or transis-tors separate from each other, as shownin Fig. B.When power circuitry is not independent,one input signal can be fed to two ormore counters at once, as shown in Fig.C.3. Input and output1) Signal input type(1) Contact point inputUse highly reliable metal plated contacts.Since the contact point’s bounce timeleads directly to error in the timer opera-tions, use contacts with as short abounce time as possible. Also, select aminimum input signal width of 20 ms.(2) Non-contact point inputConnect with an open collector. Usetransistors whose characteristics satisfythe criteria given below.VCEO = 20 V min.IC = 20 mA min.I CBO = 6μA max.Also, use transistors with a residual volt-age of less than 2 V when the transistoris on.8-pin typeScrew terminal type1 —— 4 311-pin type 3 4 5 6 76 7 8 9 10Reset inputStart inputStop inputLockinputReset input12 to 40V DCQ(The above example is for reset input)8-pin typeScrew terminal type1 —— 4 311-pin type 3 4 5 6 76 7 8 9 10Reset inputStart inputStop inputLockinput8-pin typeScrew terminal type1 — — 4 311-pin type 3 4 5 6 76 7 8 9 10PRECAUTIONS IN USING THE LT4H SERIES* The short-circuit impedance should beless than 1 kΩ.[When the impedance is 0 Ω, the currentcoming from the start input and stopinput terminals is approximately 12 mA,and from the reset input and lock inputterminals is approximately 1.5 mA.]Also, the open-circuit impedance shouldbe more than 100 kΩ.* As shown in the diagram below, from anon-contact point circuit (proximityswitches, photoelectric switches, etc.)with a power supply voltage of between12 and 40 V, the signal can be inputwithout using an open collector transis-tor. In the case of the diagram below,when the non-contact point transistor Qswitches from off to on (when the signalvoltage goes from high to low), the sig-nal is input.2) The input mode and output modechange depending on the DIP switch set-tings. Therefore, before making any con-nections, be sure to confirm the opera-tion mode and operation conditions cur-rently set.3) The LT4H series use power supplywithout a transformer (power and inputterminals are not insulated). In connect-ing various kinds of input signals, there-fore, use a power transformer in whichthe primary side is separated from theungrounded secondary side as shown inFig. A, for the power supply for a sensorand other input devices so that short-cir-cuiting can be prevented.1023(Fig. A)Input contactpoint or transistor2310 PowersupplyInputterminalterminalInput102332 10(Fig. B)Input contactpoint or transistorPowersupplypoint or transistorInput contactterminalInputterminalInput(Fig. C)Powersupply33Input contactpoint or transistor102102terminalInputterminalInput

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