Section 3
Principles of operation
3.1 Rotator
The rotator is manufactured with a worm-wheel geared motor drived by a high torque dc
motor.This method, normally used in heavy duty industrial and professional machinery, permits a very
high reduction ratio, with high power torque with both low power motor drive and high brake torque,
due the self-braking property of the worm-wheel geared motor.
3.2 Electrical configuration
3.2.1
Indicator circuit
Three digit, 7 segments led display are used for the direction indicator and the antenna direction
is displayed in degrees.
A 10 turns 10K potentiometer is used as position reading, only 1 turn of the 10 turns is used to
read antenna heading. See truth table.
3.2.2
Motor power switch
The motor is powered throught two 10 Amps long life relays.
DRAW
: PST61DC, working basic block scheme
115V 60Hz
230V 50Hz
POWER
SUPPLY
AC
FILTER
PRO.SIS.TEL.
C.da Conghia 298
70043 Monopoli BA
tel.- fax ++39 80 8876607
www.prosistel.it
DRAWN BY
: Capitanio Piero
S/N
: A005
INPUT
RS232
0-12Vac
0-9Vac
CCW
ENCODER
CW
TRANSF
0-42Vac
DISPLAY
CPU
DC
MOTOR
POWER
DATE
: December, 15/2003
REV
: 1
GND
POT.
2 -
3 P
4 +5VDC
1 +
M
11
