Installation manual

Geo Direct PWM Amplifier
Introduction 6
INTRODUCTION
The Geo Direct PWM amplifiers provide a 1- or 2-axis motor power using highly integrated IGBT based
power circuitry. They support a wide variety of motors and power ranges. The Geo Direct PWM
amplifiers interface directly with Delta Tau’s PMAC2 or PMAC3 style digital ASICs, typically found in
the axis expansion cards inside a Turbo or Power UMAC rack.
The Geo Direct PWM Drive takes the actual power-transistor on/off signals from PMAC, while providing
digital phase-current feedback and status for closed-loop operation. The interface to the direct PWM
amplifier is through a standard 36-pin Mini-D style cable.
The Geo Direct PWM amplifiers are capable of driving brush, brushless, or induction motors. They
operate in the 100 VAC – 480 VAC (156 – 678 DC) range at 50/60Hz, while providing full protection:
 Over voltage
 Under voltage
 Over temperature
 PWM frequency limit
 Motor over temperature input
 Short circuit (phase – phase)
 Over current
 Safety relay circuit