H7EC datasheet(30/33 Pages) OMRON

30 / 33 page

H7E

@-N@P

Count Input, Timer Input or Reset Input

to More than One H7E Counter at a

Time

• PNP/NPN Universal DC Voltage Input

Note: H (Reset ON) level must be 4.5 V minimum.

• No-voltage Input

Note: 1. The leakage current of the transistor used for input must be

less than 1

µA.

2. The forward voltage of the diode must be as low as possible

(i.e., 0.1 V maximum with an IF of 20

µA) so that the voltage

between terminals 3 and 4 will be 0.5 V when the reset input

is ON.

Input and Power Supply

No-voltage Input Models

• Do not impose voltage on the Counter if the Counter is a model that

operates with no-voltage input, otherwise the internal circuit of the

Counter may be damaged.

Do not connect any single input signal in parallel to Counter models

operating with no-voltage input and those operating with voltage

input, otherwise the Counters may malfunction.

• When connecting a sensor to the Counter that operates with no-

voltage input, make sure that the sensor has open collector output.

• When connecting an open collector input from a transistor to the

Counter that operates with no-voltage input, make sure that the

leakage current of the transistor is 1

µA maximum.

No-voltage Input and PNP/NPN Universal DC

Voltage Input Models

• The operation of the Counter may be affected if the capacitance of

input lines exceeds 500 pF (about 10 m, with parallel wires of 2 x

2 mm).

Keep all wires as short as possible. When using shielded wire, line

capacitance may occur.

AC/DC Multi-voltage Input Models

• When connecting count/timer input from an SSR to the Counter

that operates with AC/DC voltage input, use OMRON’s G3TA-IA/ID

SSR (for DC) whose leakage current is 0.1 mA max. or connect a

bleeder resistor in parallel to the input circuit of the Counter.

Backlight Power Supply

• To reduce variation in the brightness of the backlight when using

more than one H7E with a backlight, use the same power supply for

all the backlights.

• When connecting the DC power supply for the backlights, be sure

to connect the polarities correctly.

Input Verification with the H7ET Time

Counter

(When the time range is not set to 0s to

999h59min59s)

The decimal point of the LCD blinks every other second while an

input signal is being applied. If the decimal point is not blinking, the

input signal is not being received correctly. Check the input signal

connections.

Unit Label for Time Counter and

Tachometer

A unit label has been packed with the Counter. Use in accordance

with the application.

Battery Replacement

Remove the wiring when replacing the Battery. Do not come in con-

tact with any item to which high voltage is being applied. Doing so

may result in electric shock.

Before changing the Battery, the person should ensure that they are

not carrying any static electric charge.

Procedure for replacing the Battery (refer to the diagrams below):

1. Using the tool, pry open the lift-tab on the case. (1)

2. Pull the body out of its outer case. (2)

3. Lift the Battery up by the edge and remove it. (3)

When removing the Battery, do not come in contact with the dis-

play area or any internal parts.

4. Wipe the back of the new Battery before inserting it.

5. Ensure that the + and – terminals are correctly oriented.

6. After replacing the Battery, re-insert the body into its case. (4)

Check that the case is securely held in by the lift-tab.

H =

4.7 (k

Ω)/N + V

4.7 (k

Ω)/N + R

Sensor

Leakage current:

0.1 mA max.

*Bleeder resistor

The voltage between terminals 1 and 2 must be

1.5 V maximum when the SSR is OFF.

H7EC Datasheet(PDF) 30 Page - Omron Electronics LLC

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