Brake Resistors - Danfoss VLT AQUA Drive FC 202 Design Manual

Selection
How to add the MCO 101 option:
•
The power to the frequency converter must be
disconnected.
•
The power to the live part connections on relay
terminals must be disconnected.
•
Remove the LCP, the terminal cover, and the
cradle from the FC 202.
•
Fit the MCO 101 option in slot B.
•
Connect the control cables and relief the cables
by the enclosed cable strips.
•
Various systems must not be mixed.
•
Fit the extended cradle and terminal cover.
•
Replace the LCP
•
Connect power to the frequency converter.
Relay 10 Relay 11
NC
1 2 3 4 5 6
Illustration 3.8 Wiring the Terminals
Illustration 3.9 Wiring the Terminals
MG20Z202
Design Guide
Relay 12
NC NC
7 8 9 10 11 12
Danfoss A/S © Rev. 06/2014 All rights reserved.
1
1 2 3 4 5 6
2 2
1
1 2 3 4 5 6
3 3
1
1 2 3 4 5 6
2 2
Illustration 3.10 Terminals
1 NC
2 Live part
3 PELV
Table 3.12 Legend to Illustration 3.10
WARNING
Do not combine low voltage parts and PELV systems.

3.1.11 Brake Resistors

In applications where the motor is used as a brake, energy
is generated in the motor and sent back into the
frequency converter. If the energy cannot be transported
back to the frequency converter, it increases the voltage in
the DC-line. In applications with frequent braking and/or
high inertia loads, this increase leads to an over voltage
trip in the converter and finally a shutdown. Brake resistors
are used to dissipate the excess energy resulting from the
regenerative braking. The resistor is selected in respect to
its ohmic value, its power dissipation rate, and its physical
size. Danfoss offers a wide variety of different resistors that
are specially designed to our frequency converters. See
chapter 2.14 Control with Brake Function for the
dimensioning of brake resistors. Code numbers can be
found in chapter 4 How to Order.
1 1
7 8 9 10 11 12
3
1 1
7 8 9 10 11 12
3
1 1
7 8 9 10 11 12
2
47
3 3