Lenze i700

5 Motor control & motor settings
5.11 Setting control loops
119
Lenze · i700 servo inverter · reference manual · DMS 3.0 EN · 06/2016 · TD06
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Preconditions for the execution
• The motor has to be completely parameterised.
• The monitoring of the motor utilisation (I²xt) has to be parameterised and switched actively.
Monitoring of the motor utilisation (I²xt)
( 254)
• The motor must be able to rotate freely.
• The servo inverter is free of errors and is in the "Switched on
" device status.
• For the test, the rotor of synchronous motors has to be positioned in the pole centre. Some
synchronous motors may require an alignment and blocking in the pole centre.
• The use of the manual test mode "current/frequency" for one-time alignment of the rotor is
reasonable with the following settings:
R.m.s. value = 70 ... 100 %; frequency = 0 Hz; Starting angle = 0°
Manual test mode "current/frequency"
( 57)
• Afterwards fixing by applying the holding brake or using external fixing tools.
Response of the motor during the execution
The motor will align during the first controller enable, then usually it won't align anymore.
 How to adjust the current controller by means of the manual test mode "current pulse":
1. If the servo inverter is enabled, inhibit the servo inverter.
Enable/inhibit operation via control word
( 52)
2. Calculate the starting parameters for the current controller based on the parameterised
motor data.
• For the automatic calculation, the "Current controller: Calculate controller parameters"
function is available via the object 0x2822
(or 0x3022 for axis B). Setting and
optimising the current controller ( 104)
• Optionally, a manual determination is possible as well.
3. Set object 0x2825
(or 0x3025 for axis B) to "3" to change to the "Current pulse" test mode.
4. Set setpoint current for manual test mode in the object 0x2835:1
(or 0x3035:1 for axis B).
The number of test points for the setpoint current results from the permissible current
range of the motor and its characteristic (e.g. the Lss saturation for PM servo motors).
5. Enable the servo inverter for a short time to start the test mode.
After 100 ms, controller enable is cancelled automatically by the servo inverter, avoiding
the risk of an undesired motor heat-up.
 Stop!
After the current controller has been adjusted, remove the mechanical fixing again!