Toshiba G7 Series Applications Workbook page 48

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G7 Master/Follower Via Communications

Introduction

Master/follower setup on the Toshiba G7 can be accomplished using the on board communications

ports. There are a number of arrangements that can be used to set up the drive. All make use of the

RS232/485 communications port on the drive

There are two basic arrangements that allow the communications ports on the G7 to be used to

provide a frequency or torque signal to subsequent follower drives.

1.) Multi-Drop: In this configuration, the same RS485 or TTL signal from the master drive is fed to

several follower drives. The signal is fed into the same port on each drive, which will need to be

fed into a 1(M) to 2(F) RJ45 splitter to feed the signal further down the line. This arrangement

allows the user to maintain a keypad on each drive in the series. However, signal loss is possible

in drives further down the line and a definite maximum number of drives will eventually be

reached.

2.) Daisy chain: In this configuration, communications is passed down the line alternating through the

RS485 and TTL ports. In effect, each follower drive will then become a master for each

subsequent drive This arrangement requires more setup and programming than the multi-drop

option and all drives in between the first and the last would be unable to support a keypad.

However, this option provides a very reliable signal transfer and an almost unlimited number of

drives that could be added to the chain. This option also allows for more precise control of

individual followers.

For additional assistance, please contact Toshiba Adjustable Speed Drive Marketing Dept. at (800) 872-2192

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