TM 5-3895-374-24-1
Options
Slow-down braking
The two Options are regrouped, and are available in two versions according to the power
Speed regulation
- a module
· reference VW3-A45101 for ATV-452,..M, ATV-452075 to D22, ATV-452075N to D22N,
· reference VW3-A451011 for ATV-452U40S to D30S, ATV-452D30, ATV-452D30N,
- a board, reference VW3-A45201 D90 for ATV-452 from 37 to 90 kW
In both cases, the braking resistance is supplied separately
For installation and connection of the resistance see p 66/68
Module VW3-A45101 or VW3-A451011
This module is mounted on the left side of the speed controller by clip-on fixing It is supplied with
- two multi-core cables with connectors for connection to the speed controller
slow-down braking option J8 connector of the power board,
speed regulation option J3 connector of the control board,
- Instructions for mounting and connecting
Two conductors pre-wired to the module enable linking to the + and - terminals of the speed
controller
Module VW3-A451011 two conductors pre-wired to the module must be connected to the L1 and
L2 terminals (see p 68)
Environmental conditions identical to those of the ALTIVAR Degree of protection IP20 (open)
Dimensions VW3-A45101 height 255 mm, width 55 mm, weight 1,2kg
VW3-A451011 height 300 mm, width 55 mm, weight 1,5 kg
Board VW3-A45201 D90
This board is supplied with the connection cable to the control board when used in conjunction
with the speed regulation option For mounting and connecting the board see p 70
Slow-down braking
When the frequency produced by the controller decreases rapidly, the motor behaves like an
asynchronous generator and produces a braking torque The motor feeds energy back to the
controller. Braking power depends on the rate of deceleration, the inertia of the moving mass and
the resistive torque
As the controller cannot feed the energy back into the supply, this causes an increase in the
voltage of the filter capacitors, which limits the braking effect, potentially causing the controller to
lock on overvoltage (code 0bF )
Part of the braking energy is dissipated as losses in the motor, the corresponding braking torque
varying from 10 to 35% of the rated motor torque
The slow-down braking option allows a higher braking torque to be obtained, and ensures that
part of the braking energy is dissipated in an external resistance
Composition
The slow-down braking option comprises
- a power transistor which ensures the transfer of braking resistance onto the filter capacitor
terminals
- the control electronics,
-a separate braking resistance, supplied if required,
- a low speed relay, which will control a brake if necessary pick up at f > 5 Hz and motor current
> 0,7 rated speed controller current, drop out at f < 5 Hz To modify these values refer to part 2 of
this document "Special applications" (p 81)
(page 3-213)
