H3T
H3T
148
OFF-delay Operation by External Signal
The Time Unit can be reset by applying a reset signal, enabling
OFF-delay operation via an external signal. Short-circuit 1 and 13
and then open the connection to start the time-limit operation. An
output will be made when the set time is reached. The current from
terminal1toterminal13willbeapproximately1mA,soanycontacts
that are controlled by the output must be highly reliable. When con-
trollinga transistor, the I
CEO
must be 0.1 mA and the V
CE
(sat) must
be 1.0 V or less.
For 12 VDC, short-circuit
the terminal section by
the dotted line.
When Controlling a Transistor
Note: Terminal 24 cannot be used.
Note: Terminal 24 cannot be used.
ON ONOFF
Short-circuit
1ms
Short-
circuit
Power S
1
(13 to 14, or
13 to 14, 15)
Control output
(11to12)
S
2
(1 to 13)
Set time Set time
Open
24 VDC
For 12 VDC, short-circuit
the terminal section by
the dotted line.
24 VDC
1mA
1mA
External Resistor and Operate Time
Whenusinganexternal resistor,refer tothecharacteristicdiagrams
shown below.
Use an external resistor rated at about 0.1 W/2 M
$
.
Pay attention toexternalnoise andkeep the lead length to less than
2m.
Since the characteristic diagrams represent standard data, the op-
eratetime factory-setting may notalways be uniformfrom oneprod-
uct to another.
Should higher timer precision be required, use of a variable resistor
is recommended for time adjustment.
Operate time (s)
External resistor (M
$
)
When Prolonging Reset Time
The time unit has a shorter reset time than conventional timers so
that it canbe used in combination with solid-statecircuit. To prolong
the reset time of the time unit while it is in operationto about 100ms,
connect a capacitor having the listed constant to the time unit as
shown below.
Rated voltage
Capacity of capacitor
12 VDC 10
&
F, 25 V
24 VDC 4.7
&
F, 50 V
Note: For 12 VDC short-circuit the terminal section
shown by the dotted line.
(Top View)
24 VDC
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