Jastram ENGINEERING SCA 300 - Description of SCA Inputs and Outputs

Troubleshooting
Page 28 of 31
Doc No.: MAN01502, 27-02-01 SCA 300 Manual
5.2 Description of SCA Inputs and Outputs
SCA RECEPTACLE 1 - TO RUDDER FEEDBACK UNIT
Pin Code Description
from - to
1 SHLD SCA Chassis Ground to Cable Shielding.
2 +VDC Positive DC Supply (same as R6-P2) Wired thru SCA to
RFU 1300 PCB in Stand Alone Mode (INT).
3 +RFS RFU Positive Rudder Feedback Signal to SCA PCB.
4 Vcc SCA PCB Operating Voltage to RFU 1300 PCB Not in
Stand Alone Mode (EXT) or to Positive Potentiometer Pole
of Other RFU.
5 NOT USED -
6 -RFS RFU Negative Rudder Feedback Signal to SCA PCB.
7 +CRAI RFU 1300 PCB in Stand Alone Mode (INT) Positive Rudder
Angle Indicator Signal to RAI Wired thru SCA.
8 -CRAI RFU 1300 PCB in Stand Alone Mode (INT) Negative
Rudder Angle Indicator Signal to RAI Wired thru SCA.
9 CGND Negative DC Supply (same as R6-P3) Wired thru SCA to
RFU 1300 PCB in Stand Alone Mode (INT) or to Negative
Potentiometer Pole of Other RFU.
SCA RECEPTACLE 2 - TO INPUT DEVICE
Pin Code Description
From - to
1 SHLD SCA Chassis Ground to Cable Shielding.
2 +V SCA PCB Operating Voltage (same as R1-P4 except here
protected by one resistor in series) to Input Device Positive
Potentiometer Pole.
3 +ROS Input Device Positive Rudder Order Signal to SCA PCB.
4 +ADO SCA PCB Rudder Feedback Signal Positive to Autopilot.
5 -ADO SCA PCB Rudder Feedback Signal Negative to Autopilot.
6 -ROS Input Device Negative Rudder Order Signal to SCA PCB.
7 EC-S External Command (Switch to Ground) to SCA PCB for
Stbd Dodge.
8 EC-P External Command (Switch to Ground) to SCA PCB for
Port Dodge.
9 -V One Resistor in Series Different from SCA PCB Ground to
Input Device Negative Potentiometer Pole.