In article ,
"Sun Dragon" wrote:

Hi,

I have a Robertson/Simrad AP45 pilot currently using mechanical relays to
control the steering pumps. Pumps are 240 VAC not sure of the HP or current,
probably 2 or 5 HP motors.

Is there any reason I can't replace the noisy troublesome mechanical relays
with a solid state relay such as a Teledyne like this:

http://www.mouser.com/catalog/629/1447.pdf

Thanks,

Capt. Vin



one would "Think" that any smart Hydrolic Engineer would have designed
a Steering System that used a single pump, running all the time, and
do the "Steering" by using a Vickers type "Solenoid Shuttle Valve" to
supply the Port & Starboard Hydrolic Oil Movement Control. No big
voltages except the Motor Contactor, which is (On/Off), and the Solenoid
Shuttle Valve Coils draw only a couple of amps at 12/24/32 VDc. Easily
switched with SemiConductors.