Matrix-orbital VFD2041 Legacy Manual do Utilizador descarregar pdf (Página 13)

VFD2041 rev 2

Maximum allowable current is 20 mA, which is enforced by the current limiting resistor. If the device being

switched has a resistance of 240 ohms or more the corresponding resistor may be shorted. Solder a small

jumper wire (wirewrap wire is good) between the two feedthrough holes as shown in Figure 2-10.

GPO

240 ohm

resistor

Jumper

Figure 2-10 Bypassing 240 ohm resistor

Note: The GPOs do not have any over current or over/under voltage protection so care must be taken when

using them. For instance if the external device is a relay it must be fully clamped (using a diode and

capacitor – see Figure 2-11) to absorb any generated back electro-motive force (EMF).

10 - 100 uF

1N4001

Relay

coil

GPO

Figure 2-11 Clamping a Relay

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