5.2
Basic parameters
BU 0500 GB
Subject to technical alterations
73
Parameter
Set value / Description / Note
Device
Supervisor
Parameter
set
P107
Brake reaction time
P
0 ... 2.50 s
[ 0.00 ]
Electromagnetic brakes have a physically-dependent delayed reaction time when applied. This
can cause a dropping of the load for lifting applications, as the brake only takes over the load after
a delay.
This reaction time can be taken into account under parameter P107 (Braking control).
Within the adjustable application time, the FI supplies the set absolute minimum frequency (P505)
and so prevents movement against the brake and load drop when stopping.
See also the parameter >Release time< P114
NOTE:
For the control of electromagnetic braking (especially for lifting operations) an
internal relay should be used, see Function 1, external brake (P434/441). The
minimum absolute frequency (P505) should never be less than 2.0Hz.
NOTE:
If a time > 0 is set in P107 or P114
, at the moment the FI is switched on, the level
of the excitation current (field current) is checked. If no megnetising current is
present, the FI remains in magnetising mode and the motor brake is not released.
In order to achieve a shut-down and an error message (E016) in this case,
P539 must be set to 2 or 3.
Recommendation for applications:
Lifting equipment with brake, without speed
P114 = 0.2...0.3sec.
P107 = 0.2...0.3sec.
P201…P208 = Motor data
P434 = 1 (ext. brake)
P505 = 2...4Hz
for safe start-up
P112 = 401 (off)
P536 = 2.1 (off)
P537 = 201 (off)
P539 = 2/3 (I
SD
monitoring)
against load drops
P214 = 50...100% (precontrol)
Output
frequency
P107
Brake ventilated
P114
or
P107, if P114 = 0
Signal IN
P505
Signal OUT
Time
