Rockwell Automation 1325L DC Motors, Frames C210ATZ - C440ATZ - Manual (Page 13)

DC Motors 13
Operation Balance
Motors are dynamically balanced to commercial limits unless ordered
differently. Balance is done with a full length 1/2 height shaft key. A
full shaft key is shipped with the motor. Sheave or coupling should be
balanced with a 1/2 height shaft key.
Standard Dynamic Balance Limits
Series Wound Motors
Important: Series wound motors must be solidly connected to the
driven machine and never operated without load to avoid
possible destructive high speeds.
Motor Start-Up
Highest Rated Speed
(RPM) Maximum Amplitude
(Inches)
3,000 - 4,000 0.0010
1,500 - 2,999 0.0015
1,000 - 1,499 0.0020
Up to 999 0.0025
!
ATTENTION: To guard against personal injury and/or
machine damage, observe the following precautions before
initial start-up:
• Remove all unused shaft keys and loose rotating parts
to prevent them from flying off. Replace covers and
protective devices.
• Verify that all separately excited fields are excited at
their rated voltage and that relative polarities of all
fields are correct. See
“Checking Relative Polarity of
DC Motor Fields” on page 15 .
• When the motor is supplied as part of drive system,
refer to the Drive User Manual for operating
instructions. Tachometer feedback must be properly
connected for closed loop operation. Reverse
polarities or broken connections can cause dangerous
overspeeds.
Maximum safe mechanical operating speeds are shown in
Table C, on page 10 . Motor control circuitry must prevent
motor speeds from exceeding the stated values.