Omron H3CR-A Manual page 148

H3T
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
terminal 1 to terminal 13 will be approximately 1 mA, so any contacts
that are controlled by the output must be highly reliable. When con-
trolling a transistor, the I must be 0.1 mA and the V
CEO
be 1.0 V or less.
Power S
ON
1
(13 to 14, or
13 to 14, 15)
S
Short-circuit Open
2
(1 to 13)
Control output
(11 to 12)
Set time
For 12 VDC, short-circuit
the terminal section by
the dotted line.
Note: Terminal 24 cannot be used.
When Controlling a Transistor
For 12 VDC, short-circuit
the terminal section by
the dotted line.
Note: Terminal 24 cannot be used.
148
(sat) must
CE
OFF ON
1 ms
Short-
circuit
Set time
24 VDC
1 mA
24 VDC
1 mA
External Resistor and Operate Time
When using an external resistor, refer to the characteristic diagrams
shown below.
Use an external resistor rated at about 0.1 W/2 M$.
Pay attention to external noise and keep the lead length to less than
2 m.
Since the characteristic diagrams represent standard data, the op-
erate time factory-setting may not always be uniform from one prod-
uct to another.
Should higher timer precision be required, use of a variable resistor
is recommended for time adjustment.
External resistor (M$)
When Prolonging Reset Time
The time unit has a shorter reset time than conventional timers so
that it can be used in combination with solid-state circuit. To prolong
the reset time of the time unit while it is in operation to about 100 ms,
connect a capacitor having the listed constant to the time unit as
shown below.
Rated voltage
12 VDC
24 VDC
(Top View)
Note: For 12 VDC short-circuit the terminal section
shown by the dotted line.
H3T
Capacity of capacitor
10 &F, 25 V
4.7 &F, 50 V
24 VDC