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6-70
Drive Control
Current Limitation
Unipolar Torque Limitation
Bipolar Torque Limitation
−
−
(
P
0
4037
=
−
−
t
ln
1
1
I
∗
, 1
15
cooling
=
−
−
t
ln
1
2
t
:
max. duration after which the motor temperature model reduces
1
to the max. KB current
t
:
max. duration after which the motor temperature model reduces
2
to the max. continuous current
I
:
assumed load current (> max. KB current)
Last1
I
:
assumed load current
Last2
(max. continuous current < I
S-0-0111:
motor current at standstill
P-0-4034:
thermal time constant of winding
P-0-4035:
thermal time constant of motor
P-0-4037:
thermal short-time overload of winding
c. type factor: depending on the cooling type and the resulting setting of
P-0-0640, Cooling type (see also Parameter Description):
1.0...for standard cooling (2AD, ADF, MAD, MAF, MBT, MBS,
LSF, MLF, non-ventilated MHD, MSK, MKD, MKE)
1.5...for ventilation (only MHD, MSK, MKD, MKE)
1.9...for liquid cooling (only MHD, MSK, MKD, MKE)
Fig. 6-48:
Calculating the duration for the effective peak current (see above)
The duration t
depends on:
1
• the motor-controller combination
• the thermal preloading of the drive
• the load cycle
Note:
The physical data of motor-controller combinations can be
retrieved via the selection list program "DriveSelect" (Intranet).
Notes on Commissioning
The user cannot parameterize the current limitation because the limit
values are resulting from the amplifier and motor data taken as a basis or
the application-specific load cycle.
Bipolar torque/force limits are generally determined to protect the
mechanical system because this allows defining the allowed stress of the
mechanical components (e.g. gear, coupling). The limit values to be
entered therefore depend on the mechanical axis system.
In certain cases of application, however, the process can require realizing
a variable torque limit. This can be done via S-0-0092, Bipolar
torque/force limit value, because this parameter can be cyclically
transmitted via the bus or assigned to an analog input.
Note:
Parameter P-0-0109, Torque/force peak limit is used to
determine the absolute limit and therefore always has to be
defined by means of the mechanical limits.
MPH-02, MPB-02, MPD-02
2
∗
−
−
)
(
S
0
0111
)
∗
−
1
(
P
Last
1
∗
−
−
type
factor
(
S
0
0111
)
I
Last
2
< max. KB current)
Last2
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
−
0
4034
)
2
−
−
(
P
0
4035
)
∗
cooling
type
factor
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