5 Motor control (MCTRL)
5.1 Motor selection/Motor data
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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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5.1.3 Application notes for asynchronous motors with high slip speed
Examples:
Possible impacts depending on the motor control type:
Remedies:
• For version 12.xx.xx and version 13.xx.xx the following applies:
Limit the rated motor speed: C00087
= C00089 * 60 / (number of pole pairs + 0.5)
• From version 14.00.00:
Set the motor type ("ASM" or "PSM") manually in C01001/1
. The rated motor speed does not
need to be limited since the number of pole pairs can be detected safely when the motor type
has been set manually.
Note!
If a rated motor speed is set for an asynchronous motor (ASM) in C00087 which
corresponds to a very high slip speed, the number of motor pole pairs is identified
incorrectly.
Moreover, a synchronous motor is (PSM) is detected instead of an asynchronous motor
(ASM). In this case, the "Id7
" error message can occur since motor and motor control type
do not match.
Examples, possible impacts and remedies are described in the following sections.
Number of
pole pairs
Mechanical
synchronous speed
Rated motor frequency
(C00089)
Incorrect number of pole pairs if the
rated motor speed (C00087) is lower:
1 3000 rpm 50 Hz
1986 rpm
2 1500 rpm 50 Hz
1195 rpm
3 1000 rpm 50 Hz
854 rpm
4 750 rpm 50 Hz
665 rpm
Motor control type Possible impacts on the drive
Servo control (SC)
- ASM The motor can accelerate up to maximum speed of the motor.
V/f control (VFCplus + encoder)
Sensorless vector control (SLVC) The output speed is considerably too high.
Example: p=2, f
n
=50 Hz, n
n
=1195 min
-1
Speed is 50 % too high
V/f characteristic control (VFCplus)
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