H3CA8DC24 Datasheet, PDF (14/16 Pages) Omron Electronics LLC – DIN-sized (48 x 48, 45 x 75 mm) Timer with Digital Setting and LCD Display

Safety Precautions
How to Change Operation Mode
Operate the pushbuttons of the thumbwheel switch, located at the
leftmost position on the front panel to set the operation mode. Eight
operation modes (A, B, C, D, E, F, G, and H) are selectable and the
selected operation mode is displayed in the operation mode display
window.
Note: The operation mode is fixed to "A" for H3CA-8H.
The characters are yellow.
How to Change Time Unit and Rated
Time
Operate the pushbuttons of the rightmost thumbwheel switch to
select the desired time unit. Seven time units (0.1 s, s, 0.1 m, m,
0.1 h, h, or 10 h) are selectable and the selected time unit is
displayed in the time unit display window. The desired rated time is
specified by operating the three thumbwheel switches in the middle
of the front panel. The range of rated time is 001 to 999 for each unit.
Remaining time display
The remaining time is displayed
as a decreasing percentage
between 0% and 100%.
Time unit
selector
H3CA
Connecting the Operating Power
Supply
The H3CA-8@ 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 100 to 240-VAC specifications. Using
these power supplies can damage internal circuits.
The power supply connections to the H3CA-A and H3CA-FA can be
made without regard to polarity for both AC and DC power supplies;
just connect to the specified terminals (2 and 10, or A1 and A2).
When connecting a DC power supply to the H3CA-8 or H3CA-8H,
however, the polarity must be connected as indicated.
Although there is a wide range of power connectable to the H3CA-A
and H3CA-FA, be sure that there is no inductive voltage or residual
voltage applied to the timer power supply terminals (2 and 10, or A1
and A2) when the power switch is turned OFF. (Inductive voltage can
be generated in the power supply line if it is placed in parallel with
high-voltage or power lines.)
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.
Connect the power supply voltage through a relay or switch in such a
way that the voltage reaches a fixed value at once or the Timer may
not be reset or a timer error could result.
H3CA-8 and H3CA-8H Timers with AC specifications are equivalent
to capacitor loads. When switching the Timer power supply with an
SSR, use an SSR with a withstand voltage of twice the power supply
voltage.
Since the H3CA-8 and H3CA-8H Timers of AC specifications
externally discharges a part of internal energy when the power is
turned OFF, it may malfunction if an extremely sensitive relay is used
with the following sequence circuit.
If such a malfunction occurs, change the circuit configuration as
shown below on the right side.
X/a
X/a
T/b
If malfunction
T/b
X/a
is expected.
Rated time display
window
001 to 999
Rated time
selector
Time unit display
window
0.1 s, s, 0.1 m
0.1 h, h, 10 h
Note: The characters are yellow.
Time Unit and Rated Time
Time unit
0.1 s
s
0.1 m
m
0.1 h
h
10 h
Rated time
0.1 to 99.9 s
1 to 999 s
0.1 to 99.9 m
1 to 999 m
0.1 to 99.9 h
1 to 999 h
10 to 9,990 h
!CAUTION
1. Do not change the time unit, rated time, or operation mode while
the timer is in operation. Otherwise, the timer may malfunction or
be damaged. Be sure to turn off the power supply to the timer
before changing the timer unit, rated time or operation mode.
2. Note that output will be generated in C, D, E, G, or H mode even if
the rated time is set to 000. No output will be generated in A, B, or
F mode.
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