Rockwell Automation 1325R User Manual

Installation, Operation
and Maintenance Manual

Small DC Motors

• 56 Frames

2 Small DC Motors

Receiving and Handling

ATTENTION: Only qualified electrical personnel familiar with
the construction and operation of this equipment and the hazards

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involved should install, adjust, operate, and/or service this motor.
Read and understand this manual in its entirety before
proceeding. Failure to observe this precaution could result in
personal injury or loss of life.

Acceptance

Unpack motor carefully and inspect for possible damage during shipment.
Check packing materials and save any instruction tags or wiring diagrams
found in the carton. Report any damages or shortages immediately to the
local transportation agent.

ATTENTION: High voltageandrotating parts can cause serious
or fatal injury. The use of electric machinery, like all other

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utilization of concentrated power and rotating equipment, can be
hazardous. Installation, operation, and maintenance of electric
machinery should be performed by qualified personnel.
Familiarization with NEMA safety standards, national electrical
code and sound local practices is recommended.

Installation

Mounting

Check nameplate data on motor before installing to assure the correct rating
and that the available power supply agrees with the required motor power
supply. Motor should be mounted on a firm foundation. If the foundation is
not flat, use shims to prevent misalignment when tightening hold-down
bolts. DC motors arc equipped with ball bearings and may be operated in
any position. For anypositionotherthanbasedown, newdrainholesshould
be provided so that condensation is allowed to run off. Location should be
dry, clean and well ventilated for most satisfactory service. Be sure the
possibility of oil seepage into the motor is prevented. Commutator end of
the motor should be accessible so that brushes can be conveniently
inspected.

ATTENTION: To guard against personal injury or death caused
by contact with moving parts, guards (coupling, belt, chain, etc.)

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must be installed. Machines accessible to the public should be
further guarded by screening, guard rails, etc.

Mounting Instructions for 56C & 140TC Face Mounted Motors

Before mounting a “C” face motor to a mating flange, be sure both surfaces
and all mounting holes are smooth and free of debris.

When mounting into a quill type reducer, make sure the input and output
shafts are coated with an anti-seize compound suitable for the application.

Small DC Motors 3

When mounting through a flexible coupling, verify that there is adequate
clearance between the driven equipment shaft, the coupling interface and
the motor shaft. Lack of clearance may result in binding of the shafting and
premature bearing failure.

Always slide the motor tenon into the mating flange to its full depth before
tightening the mounting bolts. Do not allow the motor to hang by the shaft
extension while assembling it to the driven equipment (i.e. quill input gear
case). This may bend or crease the shaft and damage any seals that are
present.

Only use the proper mounting bolts. These should be 3/8”-16 threads per
inch and sized for length such that engagement into the motor flange does
not exceed 9/16”. For example, a gear case with a 3/8” flange thickness
requires a bolt that is: 3/8” + 9/16” = 15/16” = Maximum Bolt Length

Since 15/16” is not a standard bolt length, a 7/8” bolt or a 1” bolt with a
lockwasher can be used.

ATTENTION: To guard against motor damage such as
premature failure and/or a loose assembly, use only mounting

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bolts that are the correct length. A bolt that is too long may cause
damage to the motor.

Alignment

Shafts should be carefully aligned before tightening any couplings. Inspect
couplings and shaft for paint, dirt or burrs. If necessary, remove with
sandpaper for proper fit. Pulley or coupling should be carefully fitted. Do
not hammer on shaft, pulley or coupling.

Application

Permanent Magnet “PM” motors are not always designed for across the line
starting. This may cause loss of flux resulting in an increase in speed and
possibly instability. Wound field motors can be started across the line with
full applied voltage. However, for frequent starting or reversing, voltage
should be reduced for normal brush and commutator life.

Dynamic or regenerative braking methods should not be used unless
provisions are made to limit the maximum instantaneous current to a value
not greater than the maximum allowable peak amperes shown on the
nameplate. This also applies to plug reversing the PM motor.

Connections

All motors should be installed in accordance with the National Electric
Code and local requirements. Fuses, thermal cutouts and other protective
devices should be the proper size and rating to safely carry the load and to
interrupt the circuit on overloads.