Parker: Z/ZX/ZXF Series Brushless Servo System (ZX)

Z Drive:

The Z Drive is a brushless servo system that includes a brushless servomotor, a brushless resolver (for feedback), and a Digital Signal Processor (DSP) based servo amplifier. Digital electronics simplify system operation and maintenance. The Z Drive can accept either a digital (Step and Direction) input or an analog (±10V) input. You can configure the Z Drive to servo on commanded position, velocity, or torque. The series offers maximum speeds of 7000 rpm, maximum continuous torques of 9000 oz-in, and maximum peak torques of 18000 oz-in. The Z Drive uses two processors to achieve high-performance servo control. The first processor (DSP) compares the commanded inputs (position, velocity, or torque) to the resolver feedback, and then determines the proper motor currents to apply. The second processor handles all user communication, error checking, and additional I/O. All servo performance parameters are stored in battery-backed RAM (random access memory). Z Drive systems can be installed and operated easily with minimal training in servo systems. Z Series motor/drives are supplied as packaged systems that are factory compensated for typical load and performance requirements. In most applications, no adjustments will be required. When adjustments are required, changes to the drive can be made from two interfaces—push-button adjustments or an RS-232C interface. These interfaces provide access to all servo parameters simply and effectively. The Z Drive's power amplifier uses a bipolar 7 kHz pulse-width modulation (PWM) sinusoidal current control scheme. This type of amplifier improves reliability, power regulation, and low-speed smoothness

Features:

❏ Brushless servo motor

❏ Brushless resolver feedback

❏ Speeds to 7000 rpm

❏ Torques to 9000 oz-in continuous (18000 oz-in peak)

❏ User programmable resolutions (200 - 65536 steps/rev, 5000 steps/rev standard)

❏ Multi-processor control: no drift, no analog pots to adjust

❏ Fan-cooled compact drive enclosure

❏ 7 kHz PWM switching frequency

❏ Accepts digital step and direction inputs

❏ Accepts analog (±10V) input for velocity or torque control

❏ Analog (±10V) output monitor for either velocity or torque

❏ Pseudo 4096 pulse per revolution (ppr) incremental encoder output for interfacing with servo controls

❏ Servo parameters factory-set and stored in battery-backed RAM (random access memory)

❏ High-noise immunity due to optical isolation and brushless resolver technology

❏ Simple push-button adjustment of servo gains

❏ Alphanumeric display for fault or user-defined messages

❏ RS-232C interface

ZX Drive

The ZX Series servo system incorporates all the functions of a high-level indexer with the power of a Z servo system. The ZX is a brushless servo positioning system that includes a brushless servo motor, brushless resolver feedback, a digital signal processor (DSP) based closed-loop drive amplifier, and a powerful X language indexing system. The ZX has Compumotor's latest X language enhancements. It offers registration and complex segmented-move capabilities. The ZX provides PLC communication and thumbwheel input functionality with its seven inputs and four outputs. The ZXF also provides position and velocity following capabilities.

The ZX's servo drive uses a DSP and a sophisticated servo control algorithm for superior closed-loop performance. The control loop is closed around the motor shaft. The motor's resolver provides position feedback. All servo performance parameters are stored in batterybacked memory. You do not have to make analog tuning potentiometer adjustments that conventional systems require. The ZX's power amplifier section uses a rugged, bipolar 7 kHz pulse width modulation (PWM) sinusoidal current control scheme. This construction improves reliability, power regulation, and low-speed smoothness.

The ZX provides the following flexible programming features.

❏ One registration input that is given the highest priority

❏ Calculation delay times for motion as low as 500 µs

❏ A complex motion profiling system that allows you to:

• Change velocity based on distance without stopping

• Change distance, or turn on outputs on-the-fly

❏ High-level programming commands such as:

• IF/THEN/ELSE/WHILE • REPEAT/UNTIL

• GOTO AND GOSUB

❏ Complex evaluations such as checking input levels, error conditions, boolean evaluations, and variable comparisons for basic programming branching decisions can be made

❏ An output can be configured to provide pulse and direction to second axis to control velocity and distance

❏ PLC functionality and interfacing capability using the 7 inputs and 4 outputs

ZXF

The ZXF option can perform velocity following and distance following moves at a following ratio. The ZXF can follow from an incremental encoder.

You can program the ZXF for following applications with its command language and report back/verification feature. You can enter following ratios via thumbwheels and change them on-the-fly. You can perform preset moves at a specified velocity ratio. You can perform registration moves while in the Following mode. Registration moves can either follow at a ratio of the master velocity or be executed in the standard motion modes. The ZXF can jog the motor in Following mode to help set up a system. You can change the following ratio incrementally with the UP and DOWN pushbuttons on the front panel.

You can use the ZXF's special Synchronization mode to compensate for system errors (e.g., stretching in a web processing system).

The Model ZXF provides the following additional features:

❏ Controls a speed based on a ratio of a primary axis speed

❏ Makes preset moves at a velocity ratio of a primary axis

❏ Synchronizes speed to a primary axis based on registration marks on material

❏ Changes following ratio and other functions based on the encoder position of a primary axis (Cam Following)