NORD Drivesystems BU0500 - Manual (Page 78)

SK 500E – Users Manual for Frequency Inverters
78 BU 0500 GB-1013
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P107
Brake reaction time
(Brake reaction time)
P
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 with parameter P107 (Brake control).
Within the adjustable reaction 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 magnetising 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 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 = 150%
P539 = 2/3 (I
SD
monitoring)
to prevent load drops
P214 = 50...100% (precontrol)
* Setting values (P107/114) depending
on the brake type and the size of the
motor. For lower powers (< 1.5 kW) the
values also tend to be lower. For larger
powers (>4.0 kW) the values tend to be
larger than those stated.
Output
frequency
P107
Brake released
P114
or
P107, if P114 = 0
ON signal
P505
OFF signal
Time
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