Operation and Maintenance Manual

3 REAR PANEL CONFIGURATION
The rear panel is shown in Figure B-4. It contains a power select area, power
input, fuses, a connector for the cable to the positioner, two communications
connectors, and a chassis ground connector.
3.1 Power Selection, Input, and Fuses
Power input is through the power connector J1.
The switch labeled "MAINS SELECT" has two positions, 115 VAC and 230
VAC.
The "MAINS SELECT" switch must be set to the proper
input voltage. If this is not done, damage may result to
the internal power supply used to provide DC current for
the positioner motors and the electronic circuitry.
Fuse F1 is for the AC input. Recommended fuses to be used are 4 Amp
"slow-blow" type for 230 VAC input, 8 Amp "slow-blow" type for 115 VAC.
High breaking capacity fuse (greater than 500 Amps) should be used.
3.2 Motor Fuses
Fuse F2 protects the azimuth motor and fuse F3 protects the elevation motor.
Current limit protection already exists in the amplifiers and is set to 5 Amps
continuous and 10 Amps for peaks of less than 2 seconds. This will protect
the motors from thermal overheating for ambient temperatures up to about
45°C. "Slow-blow" type fuses of 10 Amps are recommended as further
protection.