1-134 Programming Your Application
690+ Series Frequency Inverter
VOLTAGE CONTROL
Designed for VOLTS/Hz motor Control
Mode.
This function block allows the motor output
volts to be controlled in the presence of dc link
voltage variations. This is achieved by controlling the level of PWM modulation as a function of
measured dc link volts. The dc link volts may vary either due to supply
variations or regenerative braking by the motor.
Three control modes are available, None, Fixed and Automatic.
MMI Menu Map
1
SETUP
2
MOTOR CONTROL
3
VOLTAGE CONTROL
VOLTAGE MODE
BASE VOLTS
Voltage Control
NONE
–
[595] VOLTAGE MODE
–
100.00 %
–
[112] BASE VOLTS
–
Parameter Descriptions
VOLTAGE MODE
Range: Enumerated - see below
Set to NONE, no attempt is made to control the PWM modulation depth for variations in dc
link voltage.
Set to FIXED, the Inverter’s output volts are maintained, regardless of variations in the dc link
voltage. The Inverter’s product code sets the default value for demanded maximum output
voltage.
Set to AUTOMATIC, the voltage is controlled as above, but the output voltage is allowed to
rise smoothly as dc link volts vary. This allows the motor to be overfluxed during deceleration,
thereby increasing braking performance.
Enumerated Value : Voltage Mode
0 : NONE
1 : FIXED
2 : AUTOMATIC
BASE VOLTS
Range: 0.00 to 115.47 %
This parameter directly scales the output of the voltage control function block, thus allowing
further scaling of the Inverter output volts if required.
Refer also to “Quadratic/Constant Torque Selection”, page 1-
136.
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