NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
144
BU 0200 en-US-4920
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P107
Brake reaction time
(brake application time)
P
0 ... 2.50 s
{ 0.00 }
Electromagnetic brakes have a physically induced delayed reaction time when applied. This can
cause a load drop in lifting applications as the brake takes over the load after a delay.
Take the application time into consideration through the parameter P107 setting.
Within the adjustable application time, the VFD supplies the set absolute minimum frequency
(P505) and so prevents movement against the brake and load drop when stopping.
If a time > 0 is set in P107 or P114, the level of the magnetizing current (field current) is checked
at the moment the VFD is switched on. If an adequate magnetizing current is not present, the
VFD remains in magnetizing mode and the motor brake is not released.
In this case, set P539 to 2 or 3 in order to achieve shutdown and a fault message (E016).
See also the parameter >Release time< P114
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Information
Brake control
Utilize the relevant connection to the variable frequency drive (please see chapter 2.4.2.4
"Electromechanical brake")to control the electromechanical brake (especially in lifting gears), if
available. The absolute minimum frequency (P505) should not be less than 2.0 Hz.
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Information
Torque limitation during active setpoint delay
(P107/P114)
During an active setpoint delay, the torque is limited to a maximum of 160% of the rated
torque. This prevents the occurrence of excessive currents in the inverter or the motor stalling
if
•
the
brake application time
(P107) is set too long when the brake is applied or
•
the value for the
absolute minimum frequency
(P505) is set too high when the brake is
released.
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Application recommendation:
Lifting equipment with brake and without speed feedback
P114 = 0.02...0.4 s *
P107 = 0.02...0.4 s *
P201…P208 = motor data
P434 = 1 (ext. brake)
P505 = 2...4 Hz
for safe startup
P112 = 401 (off)
P536 = 2.1 (off)
P537 = 150%
P539 = 2/3 (I
SD
monitoring)
to prevent load drops
P214 = 50%...100% (derivative
action)
* Settings (P107/114) depending on
brake type and motor size. Lower values
apply to low power outputs (< 1.5 kW),
higher values apply to higher power
outputs (> 4.0 kW).
Output
frequency
P107
Brake released
P114
or
P107, when P114 = 0
ON signal
P505
OFF signal
Time
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