5motor interface – Lenze 9400 User Manual
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Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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5
Motor interface
5.9
Monitoring
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Speed-dependent evaluation of the motor current
By selecting a characteristic in
the permissible motor current is evaluated depending
on speed for calculating the thermal motor utilisation.
• The speed-dependent evaluation can be more or less switched off by setting
"100 %" each. The calculation simplified due to this setting corresponds to the calculation in
previous Lenze devices (e.g. 9300 servo inverter or ECS).
Parameter
Characteristic point
n
1
/n
n
Speed = "0" (standstill)
I
1
/I
n
Permissible motor current at standstill
n
2
/n
n
Speed from which the torque must be reduced for self-ventilated motors.
• Below this speed the cooling air flow of the integral fan is not sufficient
anymore.
I
2
/I
n
Permissible motor current at speed n
2
(torque reduction)
n
3
/n
n
Rated speed
I
3
/I
n
Permissible motor current at rated speed
n
4
/n
n
Speed above the rated speed (in the field weakening range for asynchronous
motors)
I
4
/I
n
Permissible motor current at speed n
4
(field weakening)
Note!
Self-ventilated standard motors are protected insufficiently at low speeds by setting
to "100 %" each.
Servo motors, however, do not have a point from which the torque must be reduced due
to a too low speed.
• When setting the characteristic in
this point must not be ignored. Hence,
point 2 is to be set ideally to point 1 or point 3.