Eurotherm Drives 590 DRV Digital, Product Manual

Page: 14 / 318

1 - 2
Chapter 1 Introduction
1
590 DRV Digital DC Drive Product Manual
Field Regulator: a full-wave, half-controlled, single-phase thyristor bridge with transient and overload protection
powers the motor field. The regulator provides either a fixed voltage or fixed current source, depending on the
selected mode of operation. The field current mode can also provide field weakening for systems requiring
extended speed range or constant horsepower control.
On-board Fuse Protection and Contactor: each drive has AC thyristor fuses and a DC contactor. Regenerative
models have DC output fuse protection.
Other Features
• Power Isolation: the 590 DRV Digital drive's control circuitry is electrically isolated from the power circuitry,
enhancing system interconnection and safety.
• Phase Rotation Insensitivity: the supply power can be connected in any phase order to the drive's main input
supply.
Caution
While the 590 DRV Digital drive is not sensitive to phase rotation, the auxiliary 120 VAC between
drives is. Do not tie the neutral wires from different 120 VAC sources together if the phases are rotated
from drive to drive.
• Frequency Auto Ranging: the control circuitry automatically adjusts to accept supply frequencies from 40-
70Hz and possesses high noise immunity from supply born interference.
• Man-Machine Interface (MMI): a two-line alphanumeric liquid crystal display (LCD) automatically displays
the first fault the drive registers. A four button keypad greatly enhances troubleshooting, tuning and commis-
sioning. Drive inputs and outputs and drive parameters are accessible through the LCD and the keypad and
through the software package SAM.
Figure 1.2 - 590 DRV Digital DC Drive Block Diagram