Simrad ROBERTSON AP45 FU91 Follow up Steering Lever, FU91 AP45 Function AP45 Displays Switch Mode

Page 2-14	Robertson AP45 Autopilot
	Operation

FU91 Follow up Steering Lever

Operation

The FU91 is activated by operating the push to take command (PTTC) button. When in “COMMAND”, the button light is switched on and the autopilot INFO display will show:

FOLLOW UP

HELMSMAN

Rudder commands are made by setting the lever to the required rudder angle, wherafter the rudder will move to the commanded angle and stop.

FU91 may be connected to AP45 in two different ways. See Fig. 5-32 and Fig. 5-33

FU91 without mode switching

The lever can only be activated when the autopilot is in Helmsman mode. Pressing the PTTC button repeatedly will toggle between NFU and FU mode on AP45. See table below.

FU91	AP45	Function	AP45 Displays
Switch	Mode
OFF	MANUAL	NFU steering by NFU	NON FOLLOW UP	H	085
		lever or push button	MANUAL
		control
ON	MANUAL	Follow Up steering by	FOLLOW UP	H	085
		moving FU91 lever to	MANUAL
		desired rudder angle
		as read on FU91
ON-OFF	AUTO	Automatic steering	* * * * *
				A 080
			AUTO

Note!

If the Helmsman button is pressed when the FU91 is active, or if a NFU lever is operated, the autopilot will go to NFU mode even though the PTTC button light is on. However, as soon as the FU91 is operated again (lever is moved), the autopilot will resume FU mode.

For safety reason, the FU91 should always be switched to OFF when not in use.

FU91 with mode switching

The lever can be activated also with autopilot in Auto mode. Pressing the PTTC button brings the AP45 into Helmsman mode. What mode/sequence you get when pressing the PTTC button again is depending on which value of the resistor R is installed (Ref. page 5-29)

R = 1K: Auto - Dodge - Auto (previous course)

R = 3K: Auto Manual - Manual

R = 5,1K: Auto - Manual - Auto (new course)

The mode change sequence is in principle similar to S9 operation alt. 2, 3 and 4 explained at page 2-12and 2-13.

Simrad Robertson AS

Egersund - Norway