Rockwell Automation 1325L DC Motors, Frames C210ATZ - C440ATZ - Manual (Page 22)

22 DC Motors
Commutation
Intermittent sparking due to overloads or slight visible sparking does
not necessarily indicate poor commutation. Poor commutation exists
when there is excessive sparking requiring abnormal maintenance.
Every case of excessive sparking should be investigated to determine
the cause and correct it.
Table J may help in analyzing commutation
problems. DC motors and generators are brushed for full load current.
If unit or units are consistently operated at less than 1/2 rated load a
condition known as threading will result.
Windings
For long life, keep windings clean and dry. Dirt or dust can be
removed by wiping them with a clean cloth, by blowing with clean,
dry, low pressure air or by vacuum cleaner. Oil or grease can be
removed with a cloth moistened with mineral solvent. Be sure not to
get any solvent on the commutator and observe all product warnings.
Filters - Cleaning
When supplied, filters on motors must be kept clean to assure proper
air flow and cooling of the motor.
The standard filter is a six-layer woven-steel fabric. The following
procedure should be used to clean these filters:
1. For light accumulations of dust, use compressed air to clean.
2. For moderate accumulations, water may be used.
3. For heavy accumulations of dirt and grease, clean the filter using
water and detergent.
4. Always completely dry filter after cleaning with water.
5. After heavy cleaning, spray with a very light coat of protective oil
to protect against possible loss of plating.
Important: Do Not use flammable solvents to clean filters.
Important: Standard washable filters may not be suitable for motors
operating in atmospheres with heavy concentrations of oil
mist. Oil mist may be drawn into the motor and cause
damage to the commutator and windings. Contact Allen-
Bradley for motors operating in heavy oil mist
atmospheres.
Brakes
Motor mounted brake, when supplied, must be adjusted and
maintained in accordance with the instructions for the specific brake.
Refer to separate instructions supplied with the motor.