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Current limit reported by autopilot control head or MFD
01-03-18, 01:20 PM (This post was last modified: 01-03-18 01:24 PM by Chuck - Raymarine - Moderator.)
Post: #1
Current limit reported by autopilot control head or MFD
Current limit reported by autopilot control head or MFD

The current limit error reported by the autopilot's control head or MFD (supporting Autopilot Controls) may be indicative of one of the following:
- a failing drive unit: As the components of a drive unit wear, the drive unit will typically draw more current.
- a failing course computer / actuator control.

Fault isolation is typically performed by performing testing the current draw of the unloaded drive unit. To do so, the drive unit will need to be disconnected from the vessel's steering system. The drive unit's motor leads will be disconnected from the course computer / ACU and a current measuring instrument will be installed on the power lead. One of the drive unit's motor leads will be connected to ground and the other to a 12V or 24V circuit (circuit based on whether the drive unit was designed for a 12V or 24V power). The leads will then be reversed, permitting the drive to be tested in the opposite direction. Should the unloaded drive unit draw more than 6A when driven in either direction, then the drive unit should be replaced or sent to Raymarine’s Product Repair Center to be bench checked / serviced. However, should the drive unit not draw more than 6A in either direction when so powered, then the autopilot course computer / ACU should be replaced or sent to Raymarine’s Product Repair Center to be bench checked / serviced.


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