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RC2000 Antenna Controller Interface Box
4.0 Heater Option
A heater option has been developed for the RC2K90INT series of interface boxes. The KB Electronics
KBPB Drive used in RCI 90VDC interface boxes has a low temperature rating of 0 C. This is inadequate
for most environments. The heater option, designated RC2K90INT-HTR adds a maximum of 100W of
heating to the box allowing a no-wind low temp of –50F for the std. 12 x 12x 6 inch interface box.
The Heater option uses a SPST thermostat that turns on at 32°F. Two 115VAC 54W heating pads are
wired in series for 230VAC –rated boxed and parallel for 115VAC –rated boxes. The heating pads are
attached to the underside of the baseplate with special high-temperature adhesive. the thermostat and
heaters are protected with a single fuse in line with the Hot AC input.
5. Installation / Setup
This section describes the installation and setup of the interface box.
5.1 Mechanical Installation
The standard interface box is housed in a 12" by 12" by 6" (height x width x depth) NEMA 4 enclosure.
NEMA 4 enclosures are suitable for outdoor use. The interface box is designed to be mounted vertically
on the antenna kingpost. The mounting holes are suitable for 1/4 inch screws. The hole pattern is 10"
(wide) by 12 3/4" high. The hinge is located on the left side of the box. Six 7/8" holes are punched in the
bottom of the box. These holes are designed for 1/2 inch electrical conduit fittings.
Higher power (¾ HP to 1 ½ HP at 115VAC, or 1 ½ HP to 3 HP at 230VAC) versions of the interface box
are housed in a 20" by 20" by 8" NEMA4 enclosure. The larger box has a bolt pattern 14" wide by 21 ¼"
high.
5.2 Electrical Installation
This sections covers the electrical connections required to connect the interface box to the AC mains,
RC2000 antenna controller, and the antenna motors, limit switches, and sensors. Please refer to the wiring
diagrams shown in figures 4 and 5. The AC power to the interface box should be disconnected
whenever the interface box is opened - lethal voltages are present inside the box.
4.2.1 Connecting to the AC Mains
It is the user's responsibility to provide AC power at the antenna. An AC disconnect which removes all
AC power to the interface box must be provided at the antenna. Each ungrounded AC line supply
conductor must be fused. The interface box is available in two versions, one for use with 120 VAC and
another for use with 240 VAC. The AC input voltage required is listed on the inside of the box lid. The
connection to the AC mains is made directly to the L1 and L2 inputs on the KBPB motor drive module(s)
in the smaller configurations (12x12x6 Housing) and to a 16-terminal block in the larger (20x20x8
Housing) configuration. A ground connection must be made to the ground lug located in the upper left
hand corner of the box. The capacity of the AC service should be sufficient to carry the load required by
the motors. For the RC2K90INT-2 remember that both motors will be running simultaneously.
4.2.2 Connections to the RC2000
A single cable is often used to connect the RC2000 to the interface box. The only connections required for
operation of the interface box are those to the RC2000 azimuth and elevation drive outputs. Each axis
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