NORD Drivesystems BU0700 - Manual (Page 66)

NORDAC SK 700E Operating Manual
66 Subject to technical alterations BU 0700 GB-1411
Parameter Setting value / Description / Note Available in Option
P107 (P) Brake reaction time always visible
0 ... 2.50 s
[ 0.00 ]
Electromagnetic brakes have a physically-dependent delayed reaction time when actuated. This can
lead to load drops during lifting applications, as the brake delays in taking over the load.
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,  Function 1, external brake (P434/441).
The minimum absolute frequency (P505) should never be less than 2.0Hz.
Recommendation for applications:
Lifting equipment with brake, without speed feedback
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 = 0 (off)
P539 = 2/3 (I
SD
monitoring)
against load drops
P214 = 50...100% (precontrol)
Output
frequency
P107
Brake released
P114
or
P107, when P114 = 0
ON Signal
P505
OFF Signal
Time
Note: When the brake ventilation time is set (P107 / P114), the brake is only triggered when at
least a ¼ of the nominal magnetising current flows (P209). The static boost P120 is
correspondingly taken into account with values < 100%.