Drive Capacity
Make sure that the motor rated current is less than the rated nameplate output current of the drive. When running more than one motor in parallel from a single drive, the drive rated current should 1.1 times larger than the total motor rated current for all connected motors or nuisance drive faults may occur.
Starting Torque
The overload rating of the drive determines the starting and accelerating characteristics of the motor. Expect lower running torque than when running the motor from line power. To get more starting torque, use a larger drive or increase both the motor and drive capacity.
Emergency/Fast Stop
During a drive fault condition, a protective circuit is activated and drive output is shut off. The motor may coast to a stop or
attempt to decelerate depending on parameter settings. If the emergency/fast stop cannot stop the load as fast as desired, a customer-supplied mechanical brake may be required. Test emergency stop circuitry before putting drive into operation.
Options
The B1, B2, +1, +2, and +3 terminals are used to connect optional power devices. Connect only devices compatible with the drive.
Repetitive Starting/Stopping
Applications with frequent starts and stops often exceed 150% of their rated current values. Heat stress generated from repetitive high current can shorten the life span of the IGBTs. The expected lifetime for the IGBTs is about 8 million start and stop cycles with a 4 kHz carrier frequency and a 150% peak current.
Yaskawa recommends lowering the carrier frequency, particularly when audible noise is not a concern. The user can also choose to reduce the load, increase the acceleration and deceleration times, or switch to a larger drive. This will help keep peak current levels under 150%. Be sure to check the peak current levels when starting and stopping repeatedly during the initial test run, and make adjustments accordingly.