Additional Connections; Mechanical Brake Control - Danfoss VLT Automation Drive FC 300 Operating Instructions Manual

®
VLT Automation Drive FC 300
Operating Instructions High Power

3.9. Additional Connections

3.9.1. Mechanical Brake Control

In hoisting/lowering applications, it is necessary to be able to control an electro-
mechanical brake:
•
•
•
•
•
If the frequency converter is in alarm mode or in an over-voltage situation, the mechanical brake
immediately cuts in.
3.9.2. Parallel Connection of Motors
The frequency converter can control several
parallel-connected motors. The total current
consumption of the motors must not exceed
the rated output current I
converter.
Control the brake using any relay output or digital output (terminal 27 or 29).
Keep the output closed (voltage-free) as long as the frequency converter is unable to
'support' the motor, for example due to the load being too heavy.
Mechanical brake control
Select
chanical brake.
The brake is released when the motor current exceeds the preset value in par. 2-20.
The brake is engaged when the output frequency is less than the frequency set in par.
2-21 or 2-22, and only if the frequency converter carries out a stop command.
for the frequency
M,N
NB!
Installations with cables con-
nected in a common joint as in
the illustration below, is only
recommended for short cable
lengths.
NB!
When motors are connected in
Automatic
parallel, par. 1-29
Motor Adaptation (AMA)
be used.
NB!
The electronic thermal relay
(ETR) of the frequency convert-
er cannot be used as motor pro-
tection for the individual motor
of systems with parallel-connec-
ted motors. Provide further mo-
tor protection by e.g. thermis-
tors in each motor or individual
thermal relays (circuit breakers
are not suitable as protection).
MG.33.U1.02 - VLT ® is a registered Danfoss trademark
[32] in par. 5-4* for applications with an electro-me-
cannot
3. How to Install
3
69