Lenze L-force HighLine C 8400 Series Reference Manual page 252

8400 HighLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
4. Set the flying restart current in C00994.
We recommend setting a flying restart current of 10 % ... 25 % of the rated motor
current.
• During a flying restart process, a current is injected into the motor to identify
the speed.
• Reducing the current causes a reduction of the motor torque during the flying
restart process. A short-time starting action or reversing of the motor is
prevented with low flying restart currents.
• An increase of the current improves the robustness of the flying restart
function.

Tip!
Use of motors with higher rated frequencies
For trouble-free operation, we recommend to manually enter a starting frequency
of 20 % of the rated motor frequency in
restart process (see above) and to use a lower flying restart current (10 % of the
rated motor current) if motors with higher rated frequencies are used.
Optimisation of the flying restart time
From version
via the setting of the integration time (C00993). A reduction of the integration
time causes the flying restart function to accelerate and thus a reduced flying
restart time.
• We recommend not to change the Lenze setting of the integration time.
• When special motor are used (e.g. multi-pole motors or ASM servo motors), a
reduced integration time may improve the flying restart behaviour.
Optimising the current controller if the behaviour is unstable
During the execution of flying restart function, peak currents/torques are avoided
by controlling the current amplitude.
Gain (C00075) and reset time (C00076) of the current controller can be adapted to
improve the jerk-free/torque-free connection of the inverter to the supply of the
rotating motor.
• We recommend not to change the Lenze setting of the current controller.
• If the behaviour of the current controller is unstable, gain and reset time can be
calculated as per the following formulae:
V
p
T
i
[5-23] Formulae for the calculation of the gain and reset time of the current controller
252
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05.00.00, the duration of the flying restart process can be influenced
V = Current controller gain (C00075)
p
L H
[ ]
ss T = Current controller reset time (C00076)
i
= --------------- -
T s [ ]
L = Motor stator leakage inductance (C00085)
ss
E
R = Motor stator resistance (C00084)
s
T = Equivalent time constant (= 500 μs)
E
L [ ] H
ss
= --------------- -
R
[ ] Ω
s
L
C00992 as well as to accelerate the flying
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011