EV-150 - Voltage - Pump Supply

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Brett,

The ACU-150 is designed for use with the M81120 12VDC Type 1 Hydraulic Pump. Please verify that is hasn't been interfaced to a 24VDC hydraulic pump by examining the pump's label for the pump's part number.

If interfaced to the correct model of hydraulic pump, then it is recommended that the ACU-150 be bypassed to test the autopilot's hydraulic pump. To do so,
1) the rudder should be centered,
2) the pump's power leads should be temporarily disconnected from the ACU-150.
3) the pump's power leads will then be connected momentarily to +12VDC and -12VDC to verify that the pump is able to drive the rudder in one direction.
4) the pump's power leads will be disconnected from +12VDC and -12VDC
5) Steps 1 through 4 will be repeated, this time reversing the connections to +12VDC and -12VDC to verify rudder movement in the opposite direction.

Is your pump operating properly when connected directly to power?