NORD Drivesystems BU0750 - Manual (Page 84)

NORDAC SK 750E Manual
84 Subject to technical amendments BU 0750 GB-3311
Parameter Setting value / Description / Note
Parameter
set
Available in Option
P107 Brake reaction time P Always visible
0 ... 2.50 s
[ 0.00 ] Electromagnetic brakes have a physically-dependent delayed reaction time when actuated. 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 (Brake 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.
Recommendation for application:
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 = 402 (off)
P536 = 2.1 (off)
P537 = 1 (on)
P539 = 2/3 (I
SD
monitoring)
to prevent load drops
P214 = 50...100%
(precontrol)
Output
frequency
P107
Brake released
P114
or
P107, if P114 = 0
ON Signal
P505
OFF Signal
Time
Note: If a brake release time is set (P107 / P114) the brake will only be actuated if at
least ¼ of the rated magnetisation current (P209) is flowing. The static boost
P120 is correspondingly taken into account with values < 100%.