installation &
operating instructions ac induction motors
4
This instruction manual has been prepared for personnel
authorized to install, operate and maintain Armstrong three
phase ac induction motors safely and correctly.
receiving inspection and handling
1Immediately check the motor for external damage that may
have occurred during shipment and if any is found, inform
the nearest Armstrong representative immediately.
2Check the nameplate data, specially the voltage and
winding connection.
3Turn the shaft and ensure it turns freely.
warning
The motor should be lifted by the lifting eyebolts or
lugs. Those are provided for lifting the motor only
and must not be used for lifting other equipment that
may be attached to the motor. All eyebolts must be
fully tightened. When lifting the motor be careful not
to damage other parts such as shaft extension, fan
cover, fan, windings, etc.
the following safety precautions
must be observed.
1Rotating parts of motor and high voltage connections can
cause serious (even fatal) injury if improperly installed,
operated or maintained. Responsible personnel should be
familiar with nema mg2 (safety standards for construction
and guide selection, installation and use of electric motors
and generators), the National Electrical Code (nec) and all
local safety regulations.
2When servicing, all power sources to the motor and
accessory devices should be de-energized, disconnected
and lock-o and all rotating parts should be inactive.
3Lifting devices, when supplied, are intended for lifting the
motor only. When other components are fixed to the motor,
dual lifting devices must be used.
4Suitable protection must be used when working near
machinery with high noise levels.
5Safety means and protection must not be by-passed or
rendered inoperative.
6The electric motor frame must be grounded in
accordance with National Electrical Code and the local
applicable regulations.
7A suitable enclosure should be provided to prevent access to
the motor by unauthorized personnel.
8Extra caution should be observed around motors that are
automatically controlled or have automatic reset relays; the
motor could restart unexpectedly and cause serious injuries.
9When belts are used to drive the equipment, belt guard
should be used to prevent injuries that could be caused by
belts breaking.
10 Shaft must be free to turn before motor is started.
installation/mounting
The motor foundation must be suciently rigid as to minimize
vibration and maintain alignment between the motor and the
driven equipment. Motors are dynamically balanced at the
factory to nema standards for vibration. However, vibration at
the motor and the driven equipment can occur if the base they
are mounted on is not rigid enough. To minimize vibration,
a strong and rigid base must be provided for the motor and
driven equipment.
Only trained personnel should perform installation of
the motor.
Direct Drive application
Direct connected motors may be coupled to the load through
flexible or rigid coupling. Coupling halves should not be
installed by hammering, unless the shaft can be backed up
to prevent damages to the bearings. Accurate mechanical
alignment is essential for successful operation. Align shafts
accurately. If reverse rotation can cause damage to the driven
equipment, check rotation before connecting the motor to the
load (see start up).
V-belt Drive application
1Mount motor sheave close to the bearing housing.
2Allow sucient clearance for rotor endplay.
3The sheave diameter should not be less than nema
recommended values (see nema mg-1-14.42).
4Align sheaves carefully. Tighten belt only enough to
prevent slippage.
Condensation Drain Holes
On Armstrong cast iron tefc motors, condensation drain holes
are located at each end of the stator housing where the feet are
located, and on the face of output flanged motors (tc, jm, jp).
The drain hole plugs inserted at the factory must be removed
to prevent condensation water build up. On horizontal foot
