I am unsure what is meant by "Contacts" I assume this means a change of state on the sensor wire. Can a type "A" sensor input accept and drive a widget on a change from 0 volts to 12 volts DC confirming that a device ie fuel pump is switched on?
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EMS -220 Type A Contacts
- Thread starter VH-IEW
- Start date
- Joined
- Mar 23, 2005
- Messages
- 13,226
Ian:
A contact might be more conventionally known as a "switch or relay close or open". Or the presence or absence of a voltage.
Yes, a Type A General Purpose Input configured as a contact can display the presence or absence of 12V... but understand that if the voltage on that input is > 15V, the input can be damaged. The more conventional (safe) way to use a contact is for a switch closure or opening, or a voltage level of 5V.
A contact might be more conventionally known as a "switch or relay close or open". Or the presence or absence of a voltage.
Yes, a Type A General Purpose Input configured as a contact can display the presence or absence of 12V... but understand that if the voltage on that input is > 15V, the input can be damaged. The more conventional (safe) way to use a contact is for a switch closure or opening, or a voltage level of 5V.
I am unsure what is meant by "Contacts" I assume this means a change of state on the sensor wire. Can a type "A" sensor input accept and drive a widget on a change from 0 volts to 12 volts DC confirming that a device ie fuel pump is switched on?
- Joined
- Mar 23, 2005
- Messages
- 13,226
The inputs are designed to be safe in a 12V airplane, which means 15V normal operation with load dump spikes to 30V. Unless you are actually running a device that can generate more than 15V, you don't need protection.
You can hook it right to the fuel pump power wire and it should do what you expect safely.
You can hook it right to the fuel pump power wire and it should do what you expect safely.