H3FA-B-DC12 Datasheet, PDF (4/10 Pages) Omron Electronics LLC – DIP Model Timer for PC Board Use Provides Contact and Solid-state Output

Connections
■ Block Diagrams
Note: All diagrams are views from the top.
H3FA-A, H3FA-B, H3FA-SA, H3FA-SB
When the input voltage is applied, the CR oscillator circuit in the
Timer starts to oscillate via the power supply circuit, the counter
circuit counts up to the preset setting, and an output signal is
produced. A transistor amplifies this signal to drive the load.
Contact Output
For the external resistor Contact output (NO contact for
For the internal variable
time-limit operation)
resistor
H3FA
The voltage across the H3FA-SA and -SB (solid-state output loads)
is the load input voltage minus the residual voltage when the
transistor turns ON.
Solid-state Output
For the external resistor
For the internal variable
resistor
Short for 12 V DC
Open for 24 V DC (See note.)
Power
supply
Reset circuit
Power
supply
Reset circuit
Reset input
Time range
selector
Contact output (NC contact for
time-limit operation)
H3FA-AU, H3FA-BU, H3FA-SAU, H3FA-SBU
Reset input
Time range selector
Load
5 to 24 V DC
10: Solid-state output terminal
12: Terminal for the internal load surge absorbing diode
Note: When using 12/24 V DC-operated models.
Contact Output
For the external resistor
For the internal variable resistor
Solid-state Output
For the external resistor
Short for 12 V DC
Open for 24 V DC (See note.)
For the internal variable resistor
Power
supply
Reset circuit
Start circuit
Power
supply
Reset circuit
Start circuit
150 mA max.
Load surge-
absorbing diode
Load
■ Rated Time and Terminal Connections
5 to 24 V DC
Note: When using a 12/24 V DC-operated model.
Model
Terminal connection
123
123
123
123
H3FA-A/-SA/-AU/-SAU
1s
H3FA-B/-SB/-BU/-SBU 6 s
10 s
1 min
10 min
60 s
6 min
60 min
Note: 1. Short-circuit terminals 21 and 22 when using the internal variable resistor of H3FA.
2. An external resistor can also be used by opening terminals 21 and 22. When using an external resistor (1 MΩ for H3FA-A/-SA, 3 MΩ for H3FA-B/
-SB), connect it between terminals 21 and 23.
4