Motor Installation; Installation Of Misc. Connections - Danfoss VLT Micro Drive FC 51 Design Manual

How to Install

6.18 Motor Installation

6.18.1 Motor Insulation
For motor cable lengths ≤ the maximum cable length
listed in chapter 9.1 Specifications, the following motor
insulation ratings are recommended, because the peak
voltage can be up to twice the DC-link voltage, 2.8 times
the mains voltage, due to transmission line effects in the
motor cable. If a motor has lower insulation rating, use a
dU/dt or sine-wave filter.
Nominal Mains Voltage Motor Insulation
≤420 V
U Standard U
N
420 V<U ≤500 V Reinforced U
N
500 V<U ≤600 V Reinforced U
N
600 V<U ≤690 V Reinforced U
N
Table 6.8 Motor Insulation Ratings

6.19 Installation of Misc. Connections

6.19.1 RS485 Bus Connection
1 or more frequency converters can be connected to a
control (or master) using the RS485 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 1 frequency converter is connected to a
master, use parallel connections.
RS 232
USB
RS 485
Illustration 6.19 RS485 Bus Connection
To avoid potential equalizing currents in the shield, ground
the cable shield via terminal 61, which is connected to the
enclosure via an RC-link.
Bus termination
Terminate the RS485 bus with resistors at both ends. For
this purpose, set switch S801 on the control card for ON.
Set the communication protocol to parameter 8-30 Protocol.
MG02K402
Design Guide
=1300 V
LL
=1600 V
LL
=1800 V
LL
=2000 V
LL
68 69 68 69 68 69
+
-
Danfoss A/S © 01/2016 All rights reserved.
6.19.2 How to Connect a PC to the
Frequency Converter
To control or program the frequency converter from a PC,
install the PC-based configuration tool MCT 10 Set-up
Software.
MCT 10 Set-up Software
MCT 10 Set-up Software has been designed as an easy-to-
use interactive tool for setting parameters in our frequency
converters.
The PC-based configuration tool MCT 10 Set-up Software is
useful for:
•
Planning a communication network off-line. MCT
10 Set-up Software contains a complete
frequency converter database.
•
Commissioning frequency converters online.
•
Saving settings for all frequency converters.
•
Replacing a frequency converter in a network.
•
Expanding an existing network.
Save frequency converter settings
1. Connect a PC to the unit via USB port.
2. Open the MCT 10 Set-up Software.
3. Select Read from drive.
4. Select Save as.
All parameters are now stored in the PC.
Save frequency converter settings
1. Connect a PC to the unit via USB port.
2. Open the MCT 10 Set-up Software.
3. Select Open, the software shows the stored files.
4. Open the appropriate file.
5. Select Write to drive.
All parameter settings are now transferred to the frequency
converter.
A separate manual for the MCT 10 Set-up Software is
available.
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