High Tech Systems & Equipment Inc. - Systems & Equipment 
Description
Parker AC890 AC Variable Frequency Drives (VFD)
The Parker AC890 is a compact, modular systems drive engineered to control speed and position of open-loop and closed-loop, single- or multi-motor AC induction or servo motor applications. Includes Safe Torque Off (STO) feature (Frames B-F) to SIL3 or PLe level as per EN ISO13849 and EN61800-5-2.
Compatible with a wide range of feedback options, the AC890 is designed to work with any AC motor and virtually any speed/position feedback options. Common bussing is supported, with a variety of common supply and common drive modules available, in addition to standalone models for simpler applications.
Available in 1 to 1200 HP at 380-500V 3-phase, and 1 to 10 HP at 220V-240V 3 phase.
Features:
4-mode operation…volts/hertz, sensorless vector, full flux vector, PMAC servo
Variable torque and constant torque ratings
Common bus connections
Safe torque off (STO) standard
Function block programming
UL, cUL listed ratings
Application macros
Choice of multiple communications cards
Programming keypad included
Options for fieldbus comms, feedback, more…
AC890 can be user configured for 5 different operating modes:
Open-Loop (volts/frequency) Control:
This mode is ideal for basic motor speed control.
Sensorless Vector Control:
With its ultra high performance sensorless vector algorithm, it delivers a combination of both high torque and close speed regulation without the need for any speed measuring transducer.
Closed-Loop Vector Control:
Full closed-loop flux vector performance can be achieved with the AC890 by simply adding an encoder feedback ‘technology box’. This provides 100% continuous full load standstill torque, plus a highly dynamic speed loop more than sufficient for the most demanding applications.
Servo Control:
Designed for the most demanding servo systems. The ultra fast control loops and process bus make the AC890 ideal for single or multi axis applications.
4 Quadrant Active front-end power supply module:
With this configuration, the energy is fed back into the mains supply with sinusoïdal currents and unity power factor; a very low current harmonic content is achieved.
