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PROGRAMMING
INSTRUCTIONS
SINUS PENTA
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13)Additional
parameter
modifications:
For the optimization of the motor performance, adjust parameters
C021
(no-load current),
C024
(mutual inductance),
C025
(rotor time constant). Consider the following:
C021
Too high values
Lower torque, especially at rated speed, because most
part of the voltage imposed by the drive is used to magnetize the motor instead of
generating a proper motor torque;
C021
Too low values
Because of the motor flux weakening, higher current
ratings are needed;
C024
Mutual inductance
This is computed each time the no-load current level is
changed. This is not binding for the motor control, but strongly affects the correct
estimation of the output torque; in case of overestimation, decrease
C025
, and vice
versa;
C025
Optimum value
To obtain the optimum value of the rotor time constant, the
best way consists in performing several attempts with a constant load but with
different values of
C025
. The optimum value is the one ensuring to obtain the
output torque with the lower current (see
M026
in the Motor Measures Menu).
When parameter
P003
= Standby Only (condition required for changing C parameters), you
can change
Cxxx
parameters in the CONFIGURATION menu only when the drive is
DISABLED or STOPPED, whereas if
P003
= Standby + Fluxing, you can change
Cxxx
parameters when the motor is stopped but the drive is enabled.
Before changing any parameters, remember that the correct code for parameter
P000
must
be previously set up.
You can write down any custom parameters in the table provided on the last pages of this
Programming Manual.
14) Reset:
If an alarm trips, find the cause responsible for the alarm and reset the drive. Enable input
MDI3 (terminal 16) for some time, or press the
RESET
on the display/keypad.