H3BA datasheet(18/22 Pages) OMRON

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Solid-state Timer

H3BA-N

■ Precautions for Correct Use

Changing the Setting

Do not change the time unit, time range, or operation mode while the

Timer is in operation, otherwise the Timer may malfunction.

Connecting the Operating Power

Supply

The H3BA-N@ contains a capacitor-drop power circuit. Use a

sinusoidal power supply with a commercial frequency. Do not use

power supplies with a high frequency component (such as inverter

power supplies) for Timers with 110 or 220-VAC specifications. Using

these power supplies can damage internal circuits.

If voltages other than the rated voltage is applied, the internal

components may be damaged. The internal element (varistor) will be

damaged if a voltage of higher than 100 VAC is applied to the 24-

VDC line.

Connect the power supply voltage through a relay or switch in such a

way that the voltage reaches a fixed value immediately or the Timer

may not be reset or a timer error could result.

A DC power supply can be connected if its ripple factor is 20% or

less and the mean voltage is within the rated operating voltage range

of the Timer.

If the wiring to the terminal 2 (common terminal for both the power

supply and input signals) is broken, the internal circuit will be

destroyed.

Input/Output

An appropriate input will be applied to the input signal terminals of

the Timer when one of the input terminals (terminals 5, 6, and 7) and

the common terminal (terminal 2) for the input signals are short-

circuited. Do not attempt to connect any input terminal to any

terminal other than the common terminal or to apply voltage across

other than the specified input and common terminals or the internal

circuits of the Timer may be damaged.

Note: 1.

Power supply terminal 2 is a common terminal for the input

signals (G, S, R) to the Timer. Never use terminal 10 as the

common terminal for this purpose, otherwise the internal

circuit of the Timer may be damaged.

Do not connect a relay or any other load between these two

points, otherwise the internal circuit of the Timer may be

damaged due to the high-tension voltage applied to the

input terminals.

Operating Time Setting

When setting the operating time, do not turn the setting knob beyond

its scale range. For precise time setting, conduct operation tests by

adjusting the setting knob.

The accuracy of the operating time of the Analog Timer is indicated

by the percentage value on the basis of the full-scale time. The

absolute fluctuation value will not be improved by changing the time

setting. Therefore, when selecting the model, be sure that the

application will be able to use a time setting as close as the full-scale

time setting of the Timer.

Others

When conducting a dielectric test, impulse voltage test, or insulation

resistance test between the electric circuit and non-current-carrying

metal parts of the Timer mounted to a control panel, be sure to take

the following steps. These steps will prevent the internal circuitry of

the Timer from damage that may be caused if a machine on the

control panel has an improper dielectric strength or insulation

resistance.

Separate the Timer from the circuitry of the control panel by

disconnecting the socket from the Timer or wires.

Short-circuit all terminals of the Timer.

If any device with no-contact output, such as a proximity sensor,

photoelectric sensor, or SSR, is directly connected to the Timer,

current leakage from the device may cause Timer malfunction. Be

sure to test the device with the Timer before using the device for

actual applications.

Before using the Timer to switch inductive loads, be sure to connect

a surge absorbing element to the Timer in order to prevent the Timer

from malfunction and damage. A diode is an example of a surge

absorbing element for DC circuits and a surge absorber is an

example of a surge absorbing element for AC circuits.

Do not leave the Timer in time-up condition for a month or longer in

places with high temperatures, otherwise the internal parts, such as

an electrolytic capacitor, of the Timer may be damaged. Use the

Timer with an appropriate relay so that the Timer will not be left in

time-up condition for a long time.

If the Timer is mounted in contact with a mounting surface, the

service life of internal parts may be shortened. Provide at least 10

mm between the Timer and the mounting surface to prolong the

service life of the Timer.

When the Timer is reset right after the Timer goes into time-up

condition, be sure to provide the Timer with an appropriate circuit

configuration considering the resetting time of the Timer so that a

sequential error will not result.

The Timer uses the constant value read method. Be careful when

changing the set value because the output of the Timer will be ON

when the set value coincides with the count value.

Be sure that the casing of the Timer is free from organic solvents,

such as paint thinner and benzene, strong acid, and alkali solvents,

which will damage the casing.

Note:

It is impossible to connect more than two Timers in parallel.

5, 6, 7

G, S, R

Input terminal

H3BA-N

Closed

Power supply

AC or DC

Input contact

5, 6, 7

G, S, R

Input terminal

H3BA-N

(See note 2)

2 (see note 1)

H3BA Datasheet(PDF) 18 Page - Omron Electronics LLC

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