Lenze EDB9300UES - Manual (Page 155)

Commissioning
150 BA8230
Setting - "Without":
This standard setting is used if no optional power
dump (chopper) with a braking resistor is connected.
In the speed control structure an excessive rise in the link
voltage is prevented by the effect of the regenerative current
limit.
In the U/f control structure the excessive rise in the link
voltage must be prevented by suitable parameter settings
for the braking ramps (braking ramp, ramp, fast stop, motor
potentiometer ramp down).
Setting – "With":
This setting is used if the power dump ( chopper) and a
braking resistor are installed. This switches the optional
braking resistor to the link circuit when a certain link voltage is
reached. The overvoltage on the link determines the effect of the
braking resistor.
Setting "DC with/without"
This setting is selected if a DC bus connection with several inverters
(energy exchange) or an external brake chopper is used.
Rated motor data
The next parameters to be set are the rated motor data according to the motor rating
plate. These include: Motor rated power, rated voltage, rated speed, rated frequency,
circuit (star/delta), rated current, cos
ϕ
.
As the values for all standard motors are stored in software, the values for rated
current, cos phi and the ratio between trip torque and rated torque are inserted
automatically. The values for a standard motor suitable for the inverter type used are
selected. If no standard motor is used, the following parameters must be set by hand:
- Motor rated current, according to the circuit type (star or delta)
- cos
ϕ
- Trip torque / rated torque. If M
k
/M
N
are not known, the default value, 3, is to be
retained.
The motor is now ready for operation with these settings. It can be operated within the
range of rated data using the control unit.
Adjust mode
The 8230 frequency inverter output voltage is preset in the calibration mode so that
the magnetising current calculated from the type data flows even when the motor is at
a standstill. This is achieved by matching the parameter R-stator + R-cable to the
actual values of stator and cable resistance for the motor connected. The parameter
R-stator + R-cable (object 2294) is calculated and entered automatically after the
motor type data is input. The starting and operating characteristics of the
asynchronous motor suitable for the inverter type are adequate in most cases with
these settings. If the motor current is very much lower than the inverter rated current,
the calculated value must be reduced (approximately according to the ratio between
motor rated current and inverter rated current).
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