Transistor Output Circuit - Delta AH500 series Hardware Manual

AH5 00 Hardw are Manu al

5.5.2.3 Transistor Output Circuit

The AH500 series transistor outputs are equipped with the diodes which provide the
counter-electromotive force protection. They can be used if they do not switch between ON and
OFF states frequently and there are low-power inductive loads. If they switch between ON and OFF
states frequently and there are high-power inductive loads, they must be connected to noise
suppression circuits to reduce the noise and prevent the overvoltage or the overheating from
damaging the transistor output circuit.

The NPN/PNP transistor output circuit
Direct-current power supply
①
Emergency stop
②
Fuse
③
The transistor outputs are open collectors. If Y0.0/Y0.1 is a pulse train output, the output
current passing through the output pull-up resistor must be larger than 0.1 A to ensure that
the transistor operates normally.
Relay/Solenoid valve through which the direct current passes: A diode is connected in
parallel to absorb the surge voltage which occurs when the load is OFF.
④
Relay/Solenoid valve
DC power supply
DC power supply
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