Vinten Radamec SP-2000 Pedestal - Manual (Page 102)

SP-2000/X-Y Maintenance And Repair
4-36 User Manual
Brushless Motors
Seven brushless motors and their switching drivers are used in the SP2000/X-Y.
One of the advantages of brushless motors is that they are quieter because they
avoid the screechy high-frequency sound emitted by the brushes of conventional
DC brush motors and tachometers. Tachometers are eliminated completely
because the velocity information is derived from the Hall effect encoders.
Brushless motors are far more reliable and are expected to last the life of the
product. In addition, the switching drivers are very efficient, so power con-
sumption is reduced and battery operating time is extended. Motor servicing is
limited to verifying the integrity of the two quadrature signals coming back from
each motor.
Motor Drive Amplifiers
The Motor Drive Amplifiers amplify the demand signal from the 4 Channel
Board to generate a torque-producing current that drives the motor. In addition,
they electronically commutate the brushless motor by processing the TTL phas-
ing signals from the hall encoders. There are no adjustments on the Motor Drive
Amplifiers. Each amplifier does have pluggable, factory selected current-setting
resistors.
The Motor Drive Amplifiers for steer and drive are not serviceable at the com-
ponent level in the field. However, they can be swapped with each other or the
pan/tilt Motor Drive Amplifiers in the head to isolate a fault. Note that the Motor
Drive Amplifier for column elevation is a 60V amplifier which cannot be
swapped for troubleshooting.
Contact Vinten to arrange a board exchange if necessary. If replacement amplifi-
ers are installed, the resistor values in the pluggable resistor packs must be
checked and to be sure that they are the same as the original factory installed
amplifiers.