H3FA-AU DC24 Omron, H3FA-AU DC24 Datasheet - Page 4

• Manufacturer Part Number: H3FA-AU DC24
• Description: TIMER
• Manufacturer: Omron
• Type: Solid State Timerr

Specifications of H3FA-AU DC24

• Analog / Digital: Analog
• Control Method: Dial
• Voltage Rating: 24 VDC
• Mounting: PCB
• Display Type: None
• Size: 36.9 mm x 17.75 mm x 19.5 mm
• Features: Timer operation may also be controlled through an external variable resistor
• Input Type: Voltage
• Output Type: SPST-NO and SPST-NC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
H3FA-AU, H3FA-BU, H3FA-SAU, H3FA-SBU
■ Rated Time and Terminal Connections
Note: 1. Short-circuit terminals 21 and 22 when using the internal variable resistor of H3FA.
Power
supply
Contact Output
Power
supply
H3FA-A/-SA/-AU/-SAU
H3FA-B/-SB/-BU/-SBU
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.
Model
Time range
selector
1 s
6 s
Reset input
Reset circuit
Reset circuit
For the internal variable
resistor
For the external resistor
For the internal variable resistor
For the external resistor
1
2
Start circuit
3
Contact output (NO contact for
Contact output (NC contact for
time-limit operation)
time-limit operation)
10 s
60 s
1
2
Power
supply
3
Power
supply
Terminal connection
Solid-state Output
Solid-state Output
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.
1 min
6 min
Time range selector
10: Solid-state output terminal
12: Terminal for the internal load surge absorbing diode
Note: When using 12/24 V DC
Note: When using a 12/24 V DC-operated model.
1
Reset circuit
2
Reset input
For the internal variable resistor
Reset circuit
For the external resistor
3
For the external resistor
For the internal variable
resistor
5 to 24 V DC
5 to 24 V DC
10 min
60 min
Start circuit
-operated models
Short for 12 V DC
Open for 24 V DC (See note.)
Short for 12 V DC
Open for 24 V DC (See note.)
1
150 mA max.
Load surge-
absorbing diode
2
Load
Load
3
H3FA
.
4