Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 102)

Startup
Chapter 6
6-13
!
ATTENTION: To avoid hazards of electrical shock or injury
from moving equipment, product, or process ingredients:
•
Alert all personnel.
•
Install all guards.
•
Check operation of all safety devices.
•
Be prepared to stop the motor immediately.
Final Settings
- Motor Connected
- Load Connected
Step 21
Disconnect and lock-out all power. Connect the motor to the load.
Before applying power, review the parameter descriptions in Chapter 5.
Each parameter may have a significant effect on fundamental drive and
motor operation regardless of the control method used.
Apply power. Prepare to operate the drive and motor under actual control
and load conditions. It is recommended to begin at low torque and speed.
Start the motor and run the machine or process to determine if parameter
settings are acceptable for the application. If not, stop the drive and reset
parameters. Refer to Chapter 5 to make parameter changes and record the
changes in Appendix C.
Step 22
If Increased Motor Torque is Required at Startup
Increase the value of Parameter 5 in small increments.
Parameter 5 adds from 0 to 40% of the drive output voltage to the motor at
low drive frequencies, boosting motor torque at startup. DC boost can be
added to any volts-per-Hertz curve. The optimum DC boost setting is the
lowest level that will permit satisfactory starting torque for the motor and
drive. Higher than optimum boost may produce unnecessary motor current
at low frequencies and contribute to motor overheating. Excessive boost
may even force the drive into an overcurrent condition.
Step 23
If DC Braking is Required for Speed Changes, Reversing or to Stop
the Motor
Set Parameter 14 to 1 first.
When Parameter 14 is set to a value of 1-10, the drive’s DC brake function
will be enabled. Parameters 12 and 13 along with Parameter 14 will then
set the DC brake function. The value of Parameter 14 determines the level
or strength of the braking that occurs, with 1 being the lowest, 10 the
highest.