F2: Dcu Motor Supply Failure; F3: Motor Drive Module Inhibit; F4: Inclinometer Failure; F5: Inclinometer Suspect - Advent VISLINK Newswift 90 Technical Operation Handbook

VISLINK
4.19

F2: DCU MOTOR SUPPLY FAILURE

The antenna DCU has not detected any motor supply voltage. This means no motor power is
available, and so the antenna cannot be moved. Possible causes:
The ACU4XXX motor supply has failed. Check output voltages at rear of ACU4XXX, J7.
The connections to the DCU motor power supply are reversed. Check wiring of DCU power
connector on rear of ACU4XXX.
The motor supply fuse within the antenna DCU has failed. See F3 MDB.
4.20

F3: MOTOR DRIVE MODULE INHIBIT

The stepper motor drive module within the antenna DCU has inhibited itself. Possible
causes:
Over temperature, the module has overheated due to a combination of high ambient
temperature and long driving periods of the motors.
If the stepper motors are back driven by antenna movement, such as being blown by the
wind, this can cause the motor drive module to inhibit itself. This may also be accompanied
with a freewheel alarm.
A short circuit of one of the stepper motor windings also causes the motor module to inhibit.
4.21

F4: INCLINOMETER FAILURE

The inclinometer fitted to the elevation axis has stopped responding to data requests. The
RF angle will be estimated using the systems internal elevation axis based on motor turns
and pulse counting. Possible causes:
Inclinometer broken.
Inclinometer disconnected, or wire crimp failure.
4.22

F5: INCLINOMETER SUSPECT

The RF angle calculated from the inclinometer and the internal elevation axis disagree by
more than 15°. Possible causes:
Antenna base on a very steep slope.
If the elevation axis display on ACU4XXX is continuously approximately 45°±5° and no
inclinometer error is reported, possible inclinometer connector crimp failure.
4.23

F6: DRIVE STALL DETECTED

A drive axis stall has been detected. It is possible that a stall on a axis can clear itself and
this alarm shows the cause of the axis becoming uncalibrated. Possible causes:
Axis hitting physical end stop.
Moving antenna under high wind or snow loading.
4.24

F7: DRIVE FREEWHEEL DETECTED

A drive axis freewheel has been detected. It is possible that a freewheel on a drive display
can clear itself and this alarm shows the cause of the axis becoming uncalibrated. Possible
causes:
Axis hitting physical end stop.
Moving antenna under high wind or snow loading.
Newswift 90-180 Motorised Antenna 22