Lenze E94AxHE Servo Drives 9400 HighLine (Firmware 01-37) - Manual (Page 73)

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Firmware 1.37 - 09/2006 73
9400 HighLine | Parameter setting & configuration
Motor interface
Initial commissioning | Optimise the switching performance of the inverter
5.1.7 Optimise the switching performance of the inverter
An inverter generates a pulse-width-modulated, three-phase voltage system. Due to the
design of the inverter, current-dependent and chopper-frequency-dependent losses inside
of the inverter falsify the output voltage. Since the output voltage is not measured, the
losses must be compensated by a suitable feedforward control. This is compensated via an
inverter error characteristic.
The inverter error characteristic depends, among other things, on the motor cable length
and for a motor with unknown motor parameters it must be detected at least once
individually with the device command "Detect inverter characteristic" so that a sinusoidal
current is ensured for an automatic selection of the motor parameters.
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How to determine the inverter error characteristic:
1. If the controller is enabled, inhibit the controller, e.g. with the device command
"Inhibit controller" ( C00002 = "41").
2. Execute the device command "Determine inverter characteristic" with
C00002 = "71".
The procedure starts with controller enable, if
• no other identification is active,
• no error (TRIP) has occurred, and
• no test mode is activated.
If one of the above conditions is not met, the procedure is cancelled and the
corresponding controller command status is indicated under C00003 .
Note:
By means of controller inhibit the started procedure can be aborted any time.
Characteristic values already detected are not considered.
For detailed information about the procedure, please see the following section
"Sequence".
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Tip!
For controller enable all sources for controller inhibit must be reset. In
C00158 the
sources for controller inhibit are displayed in a bit-coded manner.
The status of the controller command activated under
C00002 is indicated under
C00003 .
Note!
Not required if a Lenze motor is operated on the controller!
For an external motor with unknown motor parameters the optimisation of the
inverter switching performance is necessary for the motor parameter setting
described in the following chapter. Set motor parameters
(C 75)