18 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.
2. 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.
1. Separate the Timer from the circuitry of the control panel by
disconnecting the socket from the Timer or wires.
2. 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
2
10
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)
10