Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 173
8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
Parameterisable additional functions
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 C00992
as well as to accelerate the flying
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.
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:
[5-23] Formulae for the calculation of the gain and reset time of the current controller
V
p
= Current controller gain (C00075)
T
n
= Current controller reset time (C00076)
L
ss
= Motor stator leakage inductance (C00085)
R
s
= Motor stator resistance (C00084)
T
E
= Equivalent time constant (= 500 μs)
V
P
L
SS
H[]
T
E
s[]
-----------------=
T
i
L
SS
H[]
R
S
Ω[]
-----------------=
efesotomasyon.com - Lenze
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