REAR PANEL
TERMINAL STRIP
This 6 terminal strip at left serves as cable interface to
the rotator unit. The cable supplies power to and data
from the rotator. Your multi-conductor cable from the
rotator connects here. A ground stud is provided at right
end of terminal for shielded cables. DISCONNECT AC
POWER CORD WHEN CONNECTING CABLE LEADS.
“RS232”
This is a 9 pin female (DB9) connector for linking to
computer RS232 port.
“VAC SELECT”
A flush mounted voltage selection switch for 115 or 230 VAC. At the factory, we set this switch to “115”.
“FUSE”
Provides electrical protection to components. Replace with a 3 Amp / 250V type. Units designed for use with
special or prop-pitch motors may require a different fuse , usually a 5 amp. Match factory installed fuse. A sec-
ond high current fuse may be present on some units controlling large prop pitch and 1/3 hp and up motors.
“AC IN”
The AC cord plugs in here. Connect to a reliable 115 VAC or 230 VAC source. Power is filtered to protect com-
ponents.
TERMINAL ASSIGNMENTS
TERMINAL FUNCTION RECOM. COLOR MIN WIRE GAGE
#1 MOTOR BLACK AWG 16
#2 MOTOR WHITE AWG 16
#3 * 3 WIRE MOTOR ONLY RED AWG 16
#4 NOT USED
#5 REED SW. DC+ ORANGE AWG 24
#6 REED RETURN BLUE AWG 24
STUD CASE GND BARE NA
* THREE WIRE MOTORS INCLUDE: AC AND PROP PITCH MOTORS.
TERMINAL # 1 BECOME MOTOR COMMON. FOR OR2800DC, USE ONLY TERM. 1 AND 2.
INSTALLATION HINTS:
Poor quality wiring
or cable AND
wiring errors
are the major cause of opera-
tional failure. Occasionally this even causes rotator or control box failure.
For short runs of 100 feet or less, the wire sizes listed above are adequate. For runs over 100 feet, multi
conductor cable like Belden 9405 is fine. Since only four total conductors are required, and only two of
those conductors carry any current, 3 wires can be put in parallel for each motor lead. The danger here is
that you mix up the wire colors from one end to the other. Results can be disastrous so be very careful with
this paralleling technique. Sometimes so much capacitance exists in between the cable wires in long runs
that the nice SQUARE WAVE pulses formed by the reed switch and rotating magnets at the motor are dis-
torted and contaminated to the point that the microprocessor cannot count them accurately. A very positive
FIX for this condition is to use a shielded wire for the pulse / reed switch line. RG58 is great for this appli-
cation. It is made for outdoor use and it is reasonably rugged and tough and can withstand abuse and still
get the job done. If you want the KILLER CABLE for all applications, the WIREMAN makes an 8 conductor
plus one shielded conductor that will operate your OR2800 AC or DC reliably from over 850 feet from the
RC-2800PX. It is about the size of RG-213. We highly recommend it for those LOOONG runs! Another way
to handle a long run is to use two large #8 wires and a run of RG58. Run this way to the base of the tower
and then convert to Belden 9405 or Wireman cable for up the tower to the rotator.
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