3
Introduction
MPA Amplifiers represent a series of amplifiers that are high performance, reliable, and
efficient. The amplifiers are designed to be used with high performance brushless servo
motors. Extreme care has been taken to assure robust operation. Design consideration for
electrical transients have been implemented on the ac inputs and all I/O lines. The MPA 460-
100 series amplifiers operate over ac voltage ranges of 200 to 520 Vac from 45 to 65 Hz.
The motor feedback device is a resolver to assure normal operation at elevated motor
temperatures of 115°C for the case, and 155°C for the motor windings. The resolver
allows for both position and velocity feedback. The motor is further protected by a thermal
shutdown thermostat in the motor windings. The amplifier high power switching devices are
state of the art IGBT modules. The logic supplies are switch mode designs reducing
undesired heat. LED indicators for diagnostics are provided. Encoder simulated TTL
compatible differential quadrature outputs plus an index output are provided for external
pulse or position control. The amplifiers have inrush current protection to allow for normal
turn on. This is especially worthwhile for multiple axes. Consideration for dissipation of
regenerative energy is included with internal shunt regulators.
The ACE-1 (Analog Control Electronics) Control Board is available as a means of providing
multiple configuration and extended features to the MPA Servo Amplifier.
The following features are available:
• 6-Pole, 8-Pole, 12-Pole, and Brush Motor selection
• I/O logic level signal inversion
• 12 or 14 bit mode
• Internal or External TAC
• Four different TAC Filters
• 15 TAC Gradients per mode
• Latched fault display
• EPROM encoder selection
• Independent reference for all zero adjustments
• Lead Gain - 16 choices for Capacitor
• 16 choices for Lag Network
• Overspeed shut down
