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RC3000 Antenna Controller Chapter 2 Installation
26
2.2.2 Motor Drive
J7 is an MS3102A22-20S (Female on backpanel) connector, which terminates three motor cables. The
minimum wire size for these cables is 16AWG.
The RC3000A is designed to drive 12 to 36 volt DC azimuth, elevation, and polarization motors. The
absolute maximum allowed motor current is 12 Amps. The RC3000A employs a built-in, solid-state motor
controller (model 25A8 from Advanced Motion Controls). The motor drive module supports IR
compensation, current limiting, dual speed operation, and dynamic braking. The drive train is also
protected with resettable fuses.
The RC3000B is designed to drive 90 volt (3/4 horsepower max) or 180 volt (1.5 horsepower max) DC
azimuth and elevation motors. Ideally, 90 volt DC motors would be specified with 115 VAC input power
and 180 volt DC motors with 230 VAC input power. 180 volt motors cannot be used with 115 VAC input
power. The motor drive in the RC3000B is the model KBPB by KB Electronics . This motor drive
supports IR compensation, current limiting, dual speed operation, and dynamic braking.
The polarization drive of the RC3000B is designed to power a 12 volt DC motor which draws less than
400 ma.
The following table describes the polarity of the RC3000’s motor drive output signals.
Axis RC3000 Connector
J7 Terminals
Polarity
Azimuth G, F Azimuth CW – G has higher potential
Elevation H, J Elevation UP – H has higher potential
Polarization A, B RC3000A:Polarization CW – B has higher potential
RC3000B:Polarization CW – A has higher potential