Delta AH500 Hardware Operation Manual page 232

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4.8.2.3 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 are not turned ON/OFF frequently and there are low-power

inductive loads. If they are turned ON/OFF 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.

NPN/PNP transistor output circuit

Direct-current power supply

Emergency stop

The output terminals of a transistor module are open-collector output terminals. If Y0.0/Y0.1 is a pulse

train output terminal of a transistor module, the output current passing through its output pull-up

resistor must be greater than 0.1 A to ensure that the transistor module operates normally.

A relay or a solenoid valve is used as a DC load. A diode is connected in parallel to absorb the surge

voltage which occurs when the load is OFF.

NP N tra nsi stor ou tpu t (si nki ng )

Relay/Sol enoid valv e

D: 1 N40 01 di od e

P NP tra nsi stor ou tpu t (so ur cin g)

Relay/Solen oid valve

D: 1 N40 01 di od e

C h a p t e r 4 I n s t a l l i n g H a r d wa r e a n d W i r i n g

DC p owe r su pp ly

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