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Please note that voltages up to 1099 V DC, depending on the supply voltage, may occur on the terminals.
Frame size F Requirements
The brake resistor(s) must be connected to the brake terminals in each inverter module.
8.7.4 RS 485 Bus Connection
One or more adjustable frequency drives can be connected to a control
(or master) using the RS-485 standardized interface. Terminal 68 is con-
nected 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 shield, 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. For this purpose, set switch S801 on the control card to "ON".
For more information, see the paragraph
Switches S201, S202, and S801
.
NOTE!
Communication protocol must be set to par. 8-30
Protocol
.
8.7.5 How to Connect a PC to the Adjustable Frequency Drive
To control the adjustable frequency drive from a PC, install the MCT 10
Set-up Software.
The PC is connected via a standard (host/device) USB cable or via the RS
485 interface as shown in the section
Bus Connection
in the Programming
Guide.
NOTE!
The USB connection is galvanically isolated from the
supply voltage (PELV) and other high-voltage termi-
nals. 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.
Figure 8.38: USB connection.
FC 300 Design Guide
8 Electrical Installation
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
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