6-72
Programming Your Application
605C Frequency Inverter
UNDERLAP COMP
The underlap compensation function block
ensures sinusoidal motor current at low
motor speeds.
This significantly reduces `cogging’
(rough/pulsating motor rotation) at low speeds.
Underlap compensation is especially desirable
in lift or hoist applications.
Functional Description
Underlap is the bridge switching delay required for correct operation of the Inverter power
electronic output stage. The delay causes errors in the Inverter output voltage leading to non-
sinusoidal motor currents at low motor speeds. The result is motor cogging, and a loss of motor
torque at low speeds.
Underlap compensation removes underlap errors, and provides consistent motor operation
regardless of motor speed.
MMI Menu Map
1
SETUP PARAMETERS
2
FUNCTION BLOCKS
3
MOTOR CONTROL
4
UNDERLAP COMP
ULC ENABLE
UNDERLAP COMP
TRUE – [600]
ENABLE
–
Parameter Descriptions
ENABLE
Range: FALSE / TRUE
Enables underlap compensation when set to TRUE.
Summary of Contents for 605C
Page 16: ...1 4 Getting Started 605C Frequency Inverter ...
Page 22: ...2 6 An Overview of the Inverter 605C Frequency Inverter ...
Page 50: ...4 14 Operating the Inverter 605C Frequency Inverter ...
Page 66: ...5 16 The Operator Station 605C Frequency Inverter ...
Page 156: ...8 2 Routine Maintenance and Repair 605C Frequency Inverter ...
Page 184: ...10 22 Parameter Specification 605C Frequency Inverter ...
Page 212: ...13 6 Application Notes 605C Frequency Inverter ...
Page 214: ...14 2 Serial Communications 605C Frequency Inverter ...
Page 236: ......