Programming
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D Page D-151
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VOLTAGE CONTROL
SETUP::MOTOR CONTROL::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.
Parameter Descriptions
VOLTAGE MODE
PREF: 81.01 Default: 0 Range: 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 Drive’s output volts are maintained, regardless of variations in the dc link voltage. The Drive’s model
number 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
PREF: 81.03 Default: 100.00 % Range: 0.00 to 115.47 %
This parameter directly scales the output of the voltage control function block, thus allowing further scaling of the Drive output
volts if required.
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