Lenze L-force HighLine C 8400 Series Reference Manual page 266

8400 HighLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
 Standstill torque
 Rated torque
Characteristic for continuous operation
Limit characteristic at a mains voltage of 400 V without field weakening
Limit characteristic with field weakening
[5-28] Speed/torque characteristics of a synchronous servo motor with field weakening
Short overview of the relevant parameters:
Parameter
C00079/4
C00938
C00937/1
Highlighted in grey = display parameter
 The maximally effective field-producing motor current is calculated based on the
motor data set in C00085,
98 % of the set maximum current
permanent switching frequency set in C00018).
C00938

– In the Lenze setting, the field weakening for synchronous motors is active
(C00079/4), but the field-producing motor current is limited via
rated motor current (C00088). Hence, the maximum speed in the field weakening
operation is limited and at the same time heating of the motor in the field
weakening operation and idle state is limited.
– If a higher speed for the field weakening operation is required or the current in the
field weakening operation is to be limited (e.g. since no motor temperature
detection is available and/or heating in the field weakening operation is to be
limited), the value must be increased or reduced accordingly in C00938.
266
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M [Nm]
60
50
0
40
30
20
10
0
0 1500
Info
Field weakening
Limitation of maximally effective field-producing
motor current
• With regard to rated motor current (C00088)
Maximally effective field-producing motor current
C00089
serves to limit the maximally effective field-producing motor current as well.
L
Ž

Œ
1
3000
and C00098. Then, the value is internally limited to
(C00022 or maximally permissible current for the
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011
n [rpm]
4500
Lenze setting
Value Unit
1: On
30 %
- A
C00938 to 30 % of