Panasonic LC2H Cautions for use, Input and output connection, Self-diagnosis function

LC2H

Cautions for use

1.Input and output connection

1) Input connection

(1) Contact input

Use highly reliable metal plated contacts. Since the contact’s bounce time leads directly to error in the count value, use contacts with as short a bounce time as possible. In general, select input to have a maximum counting speed of 30 Hz.

Count	1	5	3	4	Reset
input		2			input
		6

(2)Non-contact input (Transistor input) Connect with an open collector. Use transistors whose characteristics satisfy the criteria given below.

VCEO = Min. 20 V IC = Min. 20 mA ICBO = Max. 6 µA

Also, use transistors with a residual voltage of less than 2 V when the transistor is on.

*The short-circuit impedance should be less than 1 kΩ.

(When the impedance is 0 Ω, the current coming from the count input terminal is approximately 5 mA and from the reset input terminal is approximately 1.5 mA.) Also, the open-circuit impedance should be more than 100 kΩ.

Count	1	2	5	4	Reset
input			3		input
			6

(3) Input wiring

When wiring, use shielded wires or metallic wire tubes, and keep the wire lengths as short as possible.

2) Output connection

Since the transistor output of counter is insulated from the internal circuitry by a photo-coupler, it can be used as an NPN output or PNP (equal value) output.

As NPN output

				Load
		5		Load’s power
1	2	3	4
				supply
		6
		As PNP output
		5		Load’s power
1	2	3	4
				supply
		6
				Load

2. Self-diagnosis function

If a malfunction occurs, one of the following displays will appear.

Display	Contents	Output	Restoration	Preset values after
		condition	procedure	restoration
	Malfunctioning			The preset value at
Err-00			Enter front	start-up before the
	CPU		reset key or	CPU malfunction
		OFF
			restart	occurred.
Err-01	Malfunctioning		counter	0
	memory*

* Includes the possibility that the EEP-ROM’s life has expired.

3. Terminal connection

1)When wiring the terminals, refer to the terminal layout and wiring diagrams and be sure to perform the wiring properly without errors.

An external power supply is required in order to run the main unit.

Power should be applied between
				5
terminals (1) and (2). Terminal (1) acts		1	2		3	4
				6
as the positive connection and terminal
(2) as the negative.
	Operating voltage

2) After turning the counter off, make sure that any resulting induced voltage or residual voltage is not applied to power supply terminals (1) through (2). (If the power supply wire is wired parallel to the high voltage wire or power wire, an induced voltage may be generated at the power supply terminal.)

3) Have the power supply voltage pass through a switch or relay so that it is applied at one time.

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