Groups; Brake Control; Programming Of Ramp-Up And Ramp-Down Times - Danfoss VLT 3000 Series Product Manual

Introduction

Brake control

Programming of
ramp-up and ramp-
down times
70

Groups

The brake control for the electromechani-
cal brake features functions which among
other things improve positioning.
The brake control features an optimized
relay function with a short reaction time, to
control the electromechanical brake.
The brake must be active (without voltage)
while the unit is running idle. Relay 01/04
can be programmed so that the motor
brake is released automatically when the
programmed motor frequency is exceeded.
It is possible to set separate ramp-up
(start) and ramp-down (stop), cut-out and
cut-in frequencies.
In parameter 405 (terminal 29 input), two
different ramp times can be selected.
For normal start/stop, either ramp 1 or 2
can be selected.
Quick stop is always ramp 2.
Start/Stop
Frequency/Current
Relay
®
MG.30.A7.02 - VLT is a registered Danfoss trademark
The motor current monitoring features a
function which automatically activates the
brake when the motor current drops to or
below the programmed minimum value.
It is possible to override motor current
monitoring during start-up. How long it is
to be inactive depends on the delay
setting.
To achieve high dynamics, start compen-
sation is deselected in parameter 100.
The parameters for brake control are
described below:
Para. 100 Data value [6]
Para. 230-231-
232-233 See drawing below
Para. 409/410 Data value [16][17]
WARNING:
The parameters for the relay used for
brake control must not be changed
(para. 409 or 410) as this can cause the
brake to be released and thus damage
equipment or endanger human life.