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4. Use a pair of needle nose pliers to remove the card (the end of the card is labeled either ‘115’ or ‘230’) from the power

entry module. Rotate the card and insert it into the power entry module so that the desired line voltage is displayed.

5. Replace the fuse and fuse drawer. Use a slow blow fuse that is appropriate for the line voltage selected: 8 amp for 115

VAC, 4 amps for 230 VAC.

The RC3000B can be configured at the factory for either 115 or 230 VAC operation. The RC3000B’s line voltage setting

cannot modified by the user in the field. The RC3000B uses the same power entry module as the RC3000A. With the

RC3000B, the card inside the power entry module is glued into position. The card indicates the correct voltage but the

voltage cannot be changed by the user in the field. The AC line fuses appropriate for the RC3000B are 12 amp, slow blow for

115 VAC operation and 6 amp, slow blow, for 230 VAC operation.

RC3000A Az/El/Pol Motor Drive

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 – ph: (805 389-1935). The motor drive module supports IR compensation, current limiting, dual speed

operation, and dynamic braking. The drive train is also protected with resettable fuses. Please specify the maximum current

for each axis. For motors with values of L_eff (effective inductance) less than 200 uH, additional inductance must be added

in series with the motors to insure proper operation of the motor drive. These additional inductors can be placed inside the

controller at the factory. When ordering an RC3000A specify L_eff for each motor.

The 3000B 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 (ph: 800 221 6570). 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. Motor drive

current is supplied via an MS3102A22-20S type circular connector (designated J7). Shielded cables (shield connected only

at the controller) should be used to interface the motors to the controller. A schematic detailing the motor connections is

included in the appendix.

The following table describes the polarity of the RC3000’s motor drive output signals.

Axis RC3000 Connector J7

Terminals

Polarity

Azimuth G, F For azimuth CW movement, terminal G has the higher potential.

Elevation H, J For elevation UP movement, terminal H has the higher potential.

Polarization A, B For polarization CW movement, terminal A has the higher potential.

Analog Position Sensors

RC3000/RC3050 controllers are designed to interface to 1K ohm or 5K ohm potentiometer type azimuth and polarization

position sensors and an inclinometer type elevation position sensor.

The RC3000 employs a 10 bit A/D (analog to digital) converter to sense azimuth and polarization positions. Azimuth

(polarization) position resolution can be calculated by dividing the total azimuth (polarization) travel by 983. For example, a

+90° azimuth movement mount has 180° total azimuth travel, 180 degrees B 983 gives 0.18° azimuth resolution. The

azimuth (polarization) position sense potentiometer can be connected either directly to the azimuth (polarization) axis or

driven by gears. If the azimuth potentiometer is attached directly to the azimuth axis pivot point a potentiometer with a

linearity specification of 0.25% (or better) should be employed. Multi-turn potentiometers manufactured by Contelec

(PD22xx series) have performed well in satellite antenna applications. In the US, Contelec potentiometers are distributed by

Novotechnik, ph: 508 485-2244.

Component values in the controller must be tailored to properly match the azimuth and polarization potentiometers to the

mount’s range of azimuth and polarization movement. When ordering an RC3000 or RC3050, please specify the following for

both the azimuth and polarization axis …

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