Introduction; Operating Modes - Emerson Unidrive M200 Control Quick Start Manual

1.11

Electrical installation

1.11.1

Electric shock risk

The voltages present in the following locations can cause severe electric shock and may be lethal:

•

AC supply cables and connections

•

Output cables and connections

•

Many internal parts of the drive, and external option units

Unless otherwise indicated, control terminals are single insulated and must not be touched.

1.11.2

Stored charge

The drive contains capacitors that remain charged to a potentially lethal voltage after the AC supply

has been disconnected. If the drive has been energized, the AC supply must be isolated at least ten

minutes before work may continue.

2

M200 delivers substantial communications and application integration through optional RS485 plus a

wide range of industry standard fieldbus and I/O SI modules. Enhances machine up-time and

performance with it's remote control monitoring.

2.1

The drive is designed to operate in any of the following modes:

1. Open loop mode

Open loop vector mode

Fixed V/F mode (V/Hz)

Quadratic V/F mode (V/Hz)

2. RFC - A

2.1.1

Open loop mode

The drive applies power to the motor at frequencies varied by the user. The motor speed is a result of

the output frequency of the drive and slip due to the mechanical load. The drive can improve the

speed control of the motor by applying slip compensation. The performance at low speed depends

on whether V/F mode or open loop vector mode is selected.

Open loop vector mode

The voltage applied to the motor is directly proportional to the frequency except at low speed where

the drive uses motor parameters to apply the correct voltage to keep the flux constant under varying

load conditions.

Typically 100 % torque is available down to 1 Hz for a 50 Hz motor.

Fixed V/F mode

The voltage applied to the motor is directly proportional to the frequency except at low speed where a

voltage boost is provided which is set by the user. This mode can be used for multi-motor

applications.

Typically 100 % torque is available down to 4 Hz for a 50 Hz motor.

Quadratic V/F mode

The voltage applied to the motor is directly proportional to the square of the frequency except at low

speed where a voltage boost is provided which is set by the user. This mode can be used for running

fan or pump applications with quadratic load characteristics or for multi-motor applications. This

mode is not suitable for applications requiring a high starting torque.

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Unidrive M200/201 Control Quick Start Guide

Issue Number: 2