enables the adjustable frequency drive to be controlled via the control terminals and/or serial communication. When a start signal is applied to the control

terminals and/or the bus, the adjustable frequency drive will start. The key can be

NOTE!

An active HAND-OFF-AUTO signal via the digital inputs has higher priority than the control keys [Hand on] [Auto on].

[Reset]

is used for resetting the adjustable frequency drive after an alarm (trip). The key can be

5.1.3 RS-485 Bus Connection

One or more adjustable frequency drives can be connected to a controller

(or master) using the standard RS-485 interface. Terminal 68 is connec-

ted to the P signal (TX+, RX+), while terminal 69 is connected to the N

signal (TX-, RX-).

If more than one adjustable frequency drive is connected to a master,

use parallel connections.

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

Bus termination

The RS-485 bus must be terminated by a resistor network at both ends. If the drive is the first or the last device in the RS-485 loop, set the switch S801

on the control card to ON.

For more information, see the paragraph

5.1.4 How to Connect a PC to the Adjustable Frequency Drive

To control or program the adjustable frequency drive from a PC, install the PC-based Configuration Tool MCT 10.

The PC is connected via a standard (host/device) USB cable, or via the RS-485 interface as shown in the VLT HVAC Drive

Install > Installation of misc. connections

NOTE!

The USB connection is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals. The USB connection is

connected to protection ground on the adjustable frequency drive. Use only isolated laptop for PC connection to the USB connector on

the adjustable frequency drive.

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