Installation manual

Motor Control Parameters
S1A53838 09/2011 73
Supply Voltage Correction and Motor Voltage Limitation
The setting of parameter F307 determines:
z If the drive’s voltage output will be corrected for fluctuations in the line supply voltage, or
z If the drive’s voltage output will be limited, despite increases in the line supply voltage.
The drive’s output voltage will not exceed the input supply voltage.
If parameter F307 is set to 0 or 2, no corrections are made in the motor voltage gating process in response
to fluctuations in supply voltage. As a result, the V/Hz value of the output waveform to the motor will change in
proportion to the input voltage. Conversely, if F307 is set to 1 or 3, the V/Hz value of the output waveform will
be held constant, despite changes in the supply voltage level.
If parameter F307 is set to 0 or 1, output motor voltage will be limited to the value set by parameter
[Motor rated voltage] (uLu) (see page 70
), even if the input supply voltage rises. If F307 is set to 2 or 3,
output motor voltage can rise above the level set by uLu if the input supply voltage rises above the motor rated
voltage.
If parameter [Mot cont. mode sel.] (Pt) is set to a value of 2, 3, 4, 5, or 6, the supply voltage is corrected,
regardless of the setting of parameter F307.
The diagrams below illustrate the impact of each setting of parameter F307.
0
F307 = 1
0
F307 = 0
0
F307 = 2
0
F307 = 3
Supply Voltage uncorrected, Motor Voltage Limited
uLu
Rated Voltage
Motor Voltage (V)
Output
Frequency
Input Voltage
x Input Voltage
High
Low
Supply Voltage corrected,
Motor Voltage Limited
Output
Frequency
Supply Voltage uncorrected, Motor Voltage Unlimited
Supply Voltage corrected,
Motor Voltage Unlimited
Input Voltage
High
Low
Input Voltage
High
Low
Input Voltage High
Low
Output
Frequency
Output
Frequency
uLu
Rated Voltage
Motor Voltage (V)
x Input Voltage
Motor Voltage (V)Motor Voltage (V)
Code Name / Description Factory setting
F307 [Mot volt limitation]
Supply Voltage Correction and Motor Voltage Limitation 3
0
1
2
3
[Motor volt limit]: Supply voltage uncorrected – motor voltage limited
[Line&mot correct.]: Supply voltage corrected – motor voltage limited
[No action]: Supply voltage uncorrected – motor voltage unlimited
[U Line correction]: Supply voltage corrected – motor voltage unlimited