Motor Installation; Installation Of Misc. Connections - Danfoss VLT FC51 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 it
recommended to use a dU/dt or sine wave filter.
Nominal Mains Voltage
≤420 V
U
N
6 6
420 V<U ≤500 V
N
500 V<U ≤600 V
N
600 V<U ≤690 V
N
Table 6.8 Motor Insulation Ratings

6.19 Installation of Misc. Connections

6.19.1 RS-485 Bus Connection
One or more frequency converters can be connected to a
control (or master) using the RS-485 standardised 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.
Illustration 6.19 RS-485 Bus Connection
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. For this purpose, set switch S801 on the
control card for "ON".
For more information, see the chapter Switches S201, S202,
and S801.
Communication protocol must be set to 8-30 Protocol.
56
®
VLT
Motor Insulation
Standard U =1300 V
LL
Reinforced U =1600 V
LL
Reinforced U =1800 V
LL
Reinforced U =2000 V
LL
RS 232
68 69 68 69
+
USB
-
RS 485
Micro Drive FC 51 Design Guide
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
are useful for:
•
Planning a communication network off-line. MCT
10 Set-up Software contains a complete
frequency converter database
•
Commissioning frequency converters on line
•
Saving settings for all frequency converters
•
Replacing a frequency converter in a network
•
Expanding an existing network
•
Future developed frequency converters will be
supported
Save Drive Settings
1. Connect a PC to the unit via USB com port
2. Open PC-based Configuration Tool MCT 10 Set-up
Software
3. Select Read from drive
4. Select Save as
All parameters are now stored in the PC.
Save Drive Settings
1. Connect a PC to the unit via USB com port
2. Open PC-based Configuration Tool MCT 10 Set-up
68 69 Software
3. Select Open – stored files is shown
4. Open the appropriate file
5. Select Write to drive
All parameter settings are now transferred to the
frequency converter.
A separate manual for PC-based Configuration Tool MCT
10 Set-up Software is available.
MG02K302 - Rev. 2013-12-03