Specifications

Bulletin No. VVDED397044US R12/00 Section 2—Modbus Plus Overview

December 2000 Hand/Off/Auto (HOA)

• through a PLC or other controller connected to the fast serial link via a

communication card

NOTE: The operator keypad takes priority over the terminals.

When the communication network has control of the drive, the setpoints

and commands are controlled via the network and cannot be modified by

the terminals, the keypad, or any device connected to the RS-485

MODBUS serial port. To command the drive controller by the terminals,

the keypad, or any device connected to the RS-485 MODBUS serial port,

forced local must be enabled.

Hand/Off/Auto (HOA)

When the control switch is in the auto position,

all local run and start

commands to the drive controller must be removed.

During power-up,

the ATV58 drive controller defaults to local control. (See “Local and

Remote” on page 53.) After the drive controller recovers from a power up

sequence (including such unplanned events as an AC line power

disturbance), it immediately responds to any local controls that are active

UNINTENDED EQUIPMENT ACTION

When in serial link/line mode, all terminal inputs are ignored except

digital inputs configured as stop functions.

Failure to consider the implications of unanticipated operations

can result in death, serious injury, or equipment damage.

WARNING

LOSS OF CONTROL

The user must provide a Hand/Off/Auto switch with the following

functionality:

• In the Hand position, forced local mode must be enabled.

• In the Off position, all run terminal inputs must be disabled via

open circuit, and forced local mode must be enabled.

• In the Auto position, the run terminal inputs must be disabled via

open circuit, and forced local mode must be disabled.

Failure to follow these instructions can result in death or serious

injury.

WARNING