5
Startup
Startup for motors
Compact Operating Instructions – MOVITRAC
®
LTP-B
36
5.3.4
Starting with synchronous motors without encoder feedback (PMVC control)
The synchronous motors are permanent magnet motors.
INFORMATION
The operation of synchronous motors without encoder must be checked in a test ap-
plication. Stable operation in this operating mode cannot be ensured for all applica-
tion cases.
1. Connect the motor to the inverter. During the connection, adhere to the nominal
motor voltage.
2. Enter the motor data indicated on the motor nameplate:
•
P1-07
= Internal voltage at nominal motor speed
•
P1-08
= Rated current of the motor
•
P1-09
= Rated frequency of the motor
•
P1-10
= Rated speed of the motor
•
P1-14
= 201 (extended parameter menu)
•
P4-01
= 3 (PMVC speed control)
•
P2-24
= PWM frequency (at least 8−16 kHz)
3. Set the maximum speed with P-01 to the maximum motor rated speed and the
minimum speed with P-02 to a minimum of 10% of the motor rated speed.
4. Set the acceleration and deceleration ramps using
P1-03
and
P1-04
.
5. Start the automatic motor measurement procedure "Auto Tune" as described in
chapter "Auto Tune" (→
6. Check the magnetizing current (
P0-14
) at half nominal speed without load.
•
If the value is greater than +0.3 A, the nominal motor voltage
P1-07
must be re-
duced.
•
If the value is smaller than -0.3 A, the nominal motor voltage
P1-07
must be in-
creased.
7. Adjust the stiffness in
P7-10
to optimize the control behavior:
•
Increasing
P7-10
increases the stiffness of the motor. Decreasing the parame-
ter has the opposite effect.
•
The setting range should be between 8 and 15, but may differ.
8. To adjust the rotor on enable and to achieve more torque in the lower speed
range, set
P7-14
and
P7-15
to 10% first. Individual adjustment might be neces-
sary. Note that the motor may heat up significantly due to the increased current
flow.
In rare cases, it can be helpful to compare the parameters determined in the automatic
motor measurement procedure to the parameters of the motor data. Correct them, if
necessary. Note that the values may deviate in case of long motor cables.
A new measuring procedure is not necessary.
26879778/EN – 03/2021
Содержание MOVITRAC LTP-B
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