We use the RC2000 base series of controller. This uses tachometers to count revolutions of the actuator drive motor for position
sense. This is an accurate method of locating position. The "HEDS" encoder on the feed is replaced with a weatherproof
multiturn wirewound pot for position sense.
The RCI base controller is then modified, software and hardware, to drive the
antenna contactor directly without the need of elaborate interfaces. (Simpler is better)! The controller is modified to take
a potentiometer for polarity feedback.
There are some good and bad points.
THE BAD: Using an RCI
2000 precludes the movement of the antenna from the
Antenna pad. This is due to the method of feedback. If moved from the
Pad
the controller has to be reprogrammed. (Software has been created
ReSync the controller in an emergency.
THE GOOD: There are software limits in the 2000 controller to back up the hardware
limits. Depending on the M&C system used, there is software to upgrade
the controller set ups remotely. The 2000 system is a lot less expensive
than the 2500 system.
The NEW: We have an AIU which contains the RC2000 in a NEMA4 enclosure which
is located at the antenna. This eliminates the need for a new heavy control
cable. All you need is a RS-422 or Fiber RS-422 link to your M&C system.
All major M&C systems have the RCI drivers. (Using fiber eliminates the
outages due to lightning and surges that plagued the CTI Sytem).