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RC4000 ACU Boardset
After removing the wiring harness from J13 or J14, the first thing to check is that 5 VDC is present at the
"+" pin of each limit switch. Pins 11, 13 and 15 of each connector should have +5 VDC present. If +5
VDC is not present, there is a power supply failure within the RC4000. Contact your vehicle integrator,
mount manufacturer or RCI for further instructions on how to proceed.
If +5 VDC is present, the limit switch sensing logic may be checked by placing wire jumpers between the
appropriate pins and noting if the limit switch condition is sensed correctly by the RC4000. The state of
the limit switches should be monitored via the Limits Maintenance (3.3.2.5) screen. The following table
shows which pins to jumper and state that should be seen via the Limits Maintenance screen.
LIMIT
Azimuth STOW
Elevation DOWN
Elevation STOW
Elevation UP
Polarization STOW
The azimuth CW/CCW and polarization CW/CCW limit conditions are based on voltage feedback from the
axis' position sense potentiometer on the antenna. The limits are set in the azimuth and elevation
calibration screens
(3.3.1.2.3
check the settings in the calibration screens and reference the calibration procedures
4.2.2 Motor Drive
Axis JAMMED error displayed. A jammed error indicates that the axis was commanded to move, but the
RC4000 did not sense any movement within several seconds. A jammed condition may indicate one of
several conditions:
The mount's mechanical drive mechanism is physically jammed. Inspect the mount to determine if
some mechanical problem (slipped gears, etc) exists. Unusual conditions such as icing may also cause
the mount to jam.
The mount's position is not being sensed correctly by the RC4000. After resetting the drive error, go
to MANUAL mode and attempt to jog the axis in question. If the axis does move, check to see if the axis'
displayed position is updating. If the RC4000 doesn't sense movement, it will declare a jam even though
the axis is moving.
The RC4000's motor drive is failing to output the required voltage to move the axis. Attempt to
move the axis in question via the MANUAL mode. There are several things to note:
When a jog key is pushed, can relays inside the RC4000 be heard activating? If no relays are heard, a
limit switch condition may be present that disallows movement in the axis in question. Review the above
limit switch discussion.
Can the axis move in slow speed but not in fast? If this is the case, the fast voltage setting or current limit
setting of the motor drive may need to be adjusted.
Is there voltage present at the appropriate Motor Drive Board connector J5 pins when the axis jog is
attempted? If no voltage is present, there's the possibility that a fuse inside the RC4000 has blown (take
care inside unit => must disconnect power, etc.)
If a fuse is blown, replace with the appropriate fuse. Reconnect J5 and remove the drive wires at the
motors. Attempt to jog the axis. If the fuse blows again, the drive cables should be checked for a short.
If the fuse does not blow, the motor should be checked.
Chapter 4
PINS
J14A, pins 15,16
J14B, pins 13, 14
J14B, pins 15, 16
J14B, pins 11, 12
J13A, pins 15, 16
and 3.3.1.2.4.) If these limits appear to be activating at the wrong time,
165
JUMPERED
1
0
1
0
1
Support
OPEN
0
1
0
1
0
(4.1.3
and 4.1.4.)
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