H3FA
H3FA
143
OFF-delay Operation by External Signal
The time unit can be reset through the application of an external re-
set signal. This permits the time unit to perform OFF-delay opera-
tion. With terminals
A
and
D
short-circuited, the time unit initiates
the time-limit operation uponopening these terminals and when the
set time has elapsed, output is produced. Since the current that
flows from terminal
D
to terminal
A
is about 0.1 mA, use of a high-
reliability contact is recommended for the reset input.
Contact Output (Top View)
Solid-state Output (Top View)
When using the 12/24 VDC operated timer with a 24 VDC
power supply, open terminals 13 and 15.
H3FA-AU, H3FA-BU, H3FA-SAU, H3FA-SBU
One-shot Output Operation
Upon power application (connect power to terminals
A
and
X
short-
circuit terminals
M
and
O
when usingthe 12/24 VDC operated timer
with 12 VDC power supply) and start input application (short-circuit
terminals
F
and
A
), output is produced immediately and is reset
when the set time has elapsed.
While operating the timer unit, if a reset input is applied a start input
(terminals
F
and
A
are open), the time unit stops operating and the
output is reset.
When operating an external start or reset input contact, the current
that flows from terminal
F
to terminal
A
(start input) or from terminal
D
to terminal
A
(reset input) is approx. 0.1 mA. Therefore, use of a
high-reliability contact is recommended for start and reset inputs.
When connecting an external resistorto the time unit, connect it be-
tween terminals
U
and
W
openterminals
U
and
V
.Refer to
“External
Resistor and Operate Time”.
Contact Output (Top View)
Solid-state Output (Top View)
When using the 12/24 VDC operated timer with a 24 VDC
power supply, open terminals 13 and 15.
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