EN
44
P48 t_stop [ASM, BLDC, BLDCS]
Stop delay time from P42-f_mot_max to frequency 0. The inverter reduces its frequency after the
specified ramp, and the motor operates as a generator. The rotational energy is converted into heat in the
brake resistance.
The stop time is effective only at a motor stop, after which DC braking is also performed (see P55-
t_DC_brake and P56-I_DC_brake).
If t_stop is set too short, the inverter limits the generator current to the value of P44-I_limit and the
actual stop time of the motor automatically increases but vibrations may occur during the braking
process.
Specific values: DC-brake [ASM, -, -]
- At stop, the system switches directly to DC brake, there is no generator braking
and the total rotational energy is converted into heat in the rotor.
t_fall
- t_stop is set internally as the delay (P47-t_fall).
Minimum value: 0.5 sec
Maximum value: 400 sec
Factory setting: t_fall (see P47-t_fall)
P50 Motor start [ASM]
Motor start influences the start behaviour of the ASM motors. The catch circuit prevents an overcurrent if
the inverter is switched to the running motor. The inverter starts at the maximum motor frequency P42-
f_mot_max and reduces its frequency until the inverter frequency has adapted to the motor frequency.
This process takes not more than 1 second.
Values: Normal
-Normal motor start from the frequency P41-f_mot_min, no catch circuit.
Catch at power on
- The catch circuit is active only when the inverter knows nothing about the actual
motor speed, for example after power on and reset, unless a speed sensor is
used. If the motor was braked via the generator brake, the next motor start takes
place without a catch circuit. If the motor is braked only via the DC brake (P48-
t_stop = DC-brake), the catch circuit is active at every motor start.
Always catch
- Catch circuit active at every motor start
Factory setting: Normal
P51 t_start [-, BLDC, -]
Start-up time for micro step start-up in BLDC motor from 0 Hz to P53-f_start.
With t_start > 0.5 sec; P52-I_start and P53-f_start must also be input.
In the case of the micro step start-up, the BLDC motor is operated as a synchronous motor with constant
current (P52-I_start) . The output frequency is slowly increased from 0 to the start frequency (P53-
f_start), after which the system switches to controlled motor running with e.m.f. measurement. In the
case of small centrifugal masses, the start ramp can be switched off or shorter times set. In the case of
larger centrifugal masses, longer times should be set.
Specific values: without ramp - micro step start-up ramp switched off
Minimum value: 0.5 sec - start up with micro step start-up ramp
Maximum value: 100 sec
Factory setting: Off
P52 I_start [-, BLDC, -]
Start-up current for micro step start-up, can be selected only if P51-t_start > 0. Low currents should be
set for a soft and quiet start and higher currents for fast start and larger centrifugal masses.
Minimum value: 0.1 A
Maximum value: 16 A
Factory setting: 10 A
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