25
Basic Adjustment of the Drive
4.6 Special Adjustments
The following parameters serve for the optimization of the drive and the
adaptation to certain applications. These adjustments can be ignored at
initial start-up.
This parameter can be used to regulate the output voltage in relation to the
rated frequency. With this function active, voltage variations at the input as
well as on the DC bus will have only a small influence on the output voltage
(V/Hz-characteristic). This function can be used to adapt the output voltage
for special motors and can also prevent damage to the motor resulting from
over or under voltage supply.
Adjustment range:
1...650 V (off)
Resolution:
1 V
Factory setting:
650 V (off)
Note:
Enter-Parameter
In the example below using a motor rated at 230 V / 60Hz, the output voltage
is too high due to our supply being 250 V and CP.17 off. By setting CP.17
to the correct rated motor voltage of 230 V, the voltage is clamped thereby
giving the motor the correct voltage.
If the supply voltage drops to190 V and CP.17=230 V, the inverter will still
provide rated voltage to the motor up until 190V. The output voltage can
not be increased further beyond the input therefore the motor will operate
in field weakening. To calculate at which frequency this will occur use the
following formula:
f = (60Hz/ 230 V)*190 V= 50 Hz
CP.17 = 230V V
supply
= 190V
* Both scenarios above, it is assumed no boost (CP.15=0%).
Voltage
stabilization
�����
�����
�����������
�����������
�
����
�
�
�
V
O
at V
I
= 250V stabilized
V
O
at V
I
= 250V not stabilized
V
O
at V
I
= 190V stabilized
V
O
at V
I
= 190V not stabilized
V
I
= input voltage
Vo=output voltage
