3U042 Delta Tau Geo 3U Direct PWM Drive

The Delta Tau 3U042 Geo 3U Direct PWM Drive is a 3U size Geo Direct PWM amplifier designed to drive up to two axes with 4A RMS continuous and 8A RMS peak (for 2 seconds). These drives are low power amplifiers designed to drive permanent magnet brushless (rotary or linear), AC induction and DC Brush type motors from PWM (pulse width modulated) command signals. These drive systems are designed to fit into a standard 3U rack. The 3U Geo Direct PWM drives will operate directly off the power mains wired to the backplane, typically 230VAC or 110VAC, three phase or single phase with the appropriate derating. An external power supply of +24 VDC at 1A (unregulated) is required for logic power allowing the user to control motor power separately from control logic power. The amplifiers are interfaced to a PMAC controller via ACC-24E2, ACC-24E2M, ACC-8F or ACC-8FS or other digital output servos.

These drive amplifiers are designed to receive logic-level direct digital PWM motor voltage command from the controller and convert them to high voltage for motor control. They provide the power conversion, motor current sense feedback to the controller, and comprehensive system protection. Each drive also accepts motor thermal overload sensors for drive shut down on motor over temperature. The host controller provides all other motor control functions.

The 3U Geo Direct PWM drives consist of three basic components: 3U format Drive Module, backplane that gives access for the power supply and associated metal work with fan for keeping the drive cool. The drive modules and the backplane may both be purchased separately as spares. This family of products is further supported with the availability of cable or connector kits and compatible shunt regulator resistor (regen resistor).

The amplifier has many protection features to ensure the proper operation and protection of all of the components connected to the unit. When the amplifier detects a fault, the unit will display a character indicating the type of fault. Even though backup protection is provided, the PMAC should have the I ²T protection variables set up to protect the amplifier from overcurrent over time.