The connection cable to the brake resistor must be screened and the max. length from the frequency converter to the DC bar is limited to 25 metres (82 feet).

Connect the screen by means of cable clamps to the conductive

back plate on the frequency converter and to the metal cabinet of

the brake resistor.

Size the brake cable cross-section to match the brake torque.

NB!

If a short circuit in the brake IGBT occurs, prevent power dissipation in the brake resistor by using a mains switch or contactor to disconnect the mains for the

frequency converter. Only the frequency converter shall control the contactor.

Please note that voltages up to 1099 VDC, depending on the supply voltage, may occur on the terminals.

Unit Size 5 Requirements

The brake resistor(s) must be connected to the brake terminals in each inverter module.

7.7.4 RS 485 Bus Connection

One or more frequency converters can be connected to a control (or master)

using the RS485 standardized interface. Terminal 68 is connected to the P

signal (TX+, RX+), while terminal 69 is connected to the N signal (TX-,RX-).

If more than one frequency converter is connected to a master, use parallel

connections.

In order to avoid potential equalizing currents in the screen, earth the cable screen via terminal 61, which is connected to the frame via an RC-link.

Bus termination

The RS485 bus must be terminated by a resistor network at both ends. For this purpose, set switch S801 on the control card for "ON".

For more information, see the paragraph Switches S201, S202, and S801.

150

No.

Function

81, 82

Brake resistor terminals

AF-650 GP Design Guide

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