Chapter 3. Wheel Drive Actuator
ST4000+ Autopilots Service Manual 83115-1 19
Motor drive box parts
Component Description
R1 Resistor 121R 0.1% metal film
R2 Resistor 845R 0.1% metal film
R3 Resistor 1k0 0.5W
C1 Capacitor 4700uF 20% electrolytic 25V
C2 Capacitor 4.7uF 10% solid tantalum 35V
C3 Capacitor 22uF 10% solid tantalum 35V
C4 Capacitor 4.7uF 10% solid tantalum 35V
D1 Diode MR 752
IC1 LM396K High power 10A regulator
F1 Fuse 15A quick blow
Fuseholder 1.1/4 inch
SW1 Switch Single pole single throw
TO3 Insulating kit
Diecast box
Procedure
1. Screw the drive ring clamp to the front ring. Use the group of two holes on
their own, not two holes in a group of four. Screw the torque restraint pin
into the back mounting plate
2. Connect the motor to the motor drive box, using an in - line ammeter (0 -
10 amps) to measure current
3. Connect the motor drive box to a 12V battery. The drive box provides a
regulated 10.5V supply to the motor
4. Engage the drive unit clutch
5. Use the eccentric adjuster to loosen (anti - clockwise) the locking nut and
allow the eccentric to move to the minimum tension position
6. Switch on the drive to the motor and, using a 1.5mm Allen key, rotate the
eccentric anticlockwise (as viewed from above) to increase belt tension
until the belt just stops slipping (motor stalled)
7. Check that the motor current is approximately 6.5 amps
8. Tighten the locking nut, apply Loctite to retain the setting and switch off
the motor drive.
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