User manual

AlfaSpid Rotator www.alfaradio.ca Page 14

Be careful not to over wind your coax with the next test, as there will be

no protection from over turning.

Find a small 12 volts supply which will deliver 3 to 4 amps. ( a small 12 Volt

battery will work just fine )

To confirm that the motor runs you may connect 12 volts D.C. to the lines that

go to the motor, pins 1 and 2, it should turn. Reversing the 12 Volts D.C. should

cause the motor to turn in the reverse direction.

NOTE: ON THE ELEVATION ROTATOR THERE ARE MECHANICAL

SWITCHES WHICH REMOVES THE POWER TO THE MOTOR WHEN THE

END LIMIT IS REACHED. A DIODE IS PLACED IN SERIES WITH THE

MOTOR. TO TEST FOR THIS REVERSE THE POWER TO THE MOTOR, THE

UNIT SHOULD TURN.

To confirm that the sense circuit in the rotator is working, connect an ohm

meter to the senses lines pins 3 and 4, apply 12 volts to the motor lines pins 1

and 2; you should see the ohm meter reading alternate between open circuit and

about 1200 ohms.

Pin on Rotator not

controller Typical Reading

Your

reading

Pins 1 to 2 About 2 to 4 Ohms ________

Depends on the length of

wire to rotator

Pins 3 to 4 Open or 1200 Ohms ________

Depends on the status of

the read switch

Pins 1 to 3 Open ________

Pins 2 to 3 Open ________

Pins 2 to 4 Open ________

________

Pin 1 to Ground Open ________

Pin 2 to Ground Open ________

Pin 3 to Ground Open ________

Pin 4 to Ground Open ________

________

Voltage on controller

Pins 1 to 2 About 12 volts with motor running

Depends on the supply

voltage (14 volt applied)

Pins 3 to 4 About 8.5 volts or 2.5 volts

Depends on the status of

the read switch

and the Supply voltage