Installation
and operating
instructions
AC Induction motors
File No: 48.80
Date: july 30, 2013
Supersedes: new
Date: new
contents
Receiving inspection and handling
Installation/mounting
Location
Electrical connections
Start up
Lubrication of ball or roller bearings
Frequency or relubrication
Type of grease
Procedure for relubrication
Inverter duty application
Storage
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i n sta l l at i on &
o p era t i ng in str uct ion s
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
1 Immediately check the motor for external damage that may
have occurred during shipment and if any is found, inform
the nearest Armstrong representative immediately.
2 Check the nameplate data, specially the voltage and
winding connection.
3 Turn 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.
1 Rotating 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.
7 A suitable enclosure should be provided to prevent access to
the motor by unauthorized personnel.
8 Extra caution should be observed around motors that are
automatically controlled or have automatic reset relays; the
motor could restart unexpectedly and cause serious injuries.
9 When 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 sufficiently 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).
2 When servicing, all power sources to the motor and
accessory devices should be de-energized, disconnected
and lock-off and all rotating parts should be inactive.
V-belt Drive application
1 Mount motor sheave close to the bearing housing.
3 Lifting devices, when supplied, are intended for lifting the
motor only. When other components are fixed to the motor,
dual lifting devices must be used.
3 The sheave diameter should not be less than nema
recommended values (see nema mg-1-14.42).
4 Suitable protection must be used when working near
machinery with high noise levels.
5 Safety means and protection must not be by-passed or
rendered inoperative.
6 The electric motor frame must be grounded in
accordance with National Electrical Code and the local
applicable regulations.
2 Allow sufficient clearance for rotor endplay.
4 Align 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
ac induction motors
i n sta l l a ti o n &
o perati ng i nstr ucti o ns
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mounted f1 or f2 installations, remove plugs located at each
end of stator. In vertical output shaft down flange mounted
installations, remove plugs located on face of output flange.
Foot mounted motor
Motor should be installed on a rigid foundation to prevent
excessive vibration and should be fastened securely to a base
with maximum size bolts.
start up
warning
The insulation resistance of the motor winding should
be checked before energizing the motor.
Flanged motor
All registers are accurately machined to match with the driven
equipment. Matching surfaces should be free from dirt or burrs
and solidly engaged. The complete assembly should turn freely
without stressing shaft and bearings from misalignment
and thrust.
1 It is recommended that the motor be initially started uncoupled from load. Check direction of rotation. If rotation must
be changed, allow the motor to come to a complete stop,
and interchange any two leads on a three phase motor. Fan
on fan-cooled motors that have directional rotation nameplates must be reversed on the mounting shaft if the rotation
is changed.
location
2 Connect load - The motor should start quickly and run
smoothly, if not, shut off the power at once. Recheck the
assembly including all connections before restarting.
1 Drip-proof motors are intended for use where atmosphere is
relatively clean, dry and non-corrosive. Keep windings clean
with a soft brush, cloth or vacuum.
2 Totally-enclosed motors may be installed where dirt,
moisture and corrosion are present.
note
in all cases, no surrounding structure should obstruct normal
flow of ventilating air through or over motor.
warning
Do not install general purpose motors where hazardous, inflammable or combustible vapors or dust are
present, due to the possibility of explosions or fire
and damage to property or injury to personnel.
electrical connections
1 Connect motor to correct power supply according
to nameplate.
2 Motor and control wiring, overload protection and grounding should be done in accordance with the National Electric
Code and local regulations.
3 Identify motor auxiliary device such as space heater or
temperature sensors. These should have their own isolated
circuits insulated separate from the motor power cables.
3 If excessive vibration is noted, check for loose mounting
bolts, a motor support structure that is too flexible or transmitted vibration from adjacent machinery. Periodic vibration
checks should be made as foundation settles.
4 Operate under load condition for a short period of time.
Check operating current against nameplate.
lubrication of ball or roller bearings
Grease lubricated bearings as supplied, are adequate for a long
period of operation without re-lubrication. A good maintenance
schedule for re-greasing will vary depending on motor size,
speed, duty and environment.
i n sta l l at i on &
o p era t i ng in str uct ion s
ac induction motors
6
frequency or relubrication
Volume reference table
The following table suggests re-lubrication intervals for motor
on normal steady running, light duty indoor load in relatively
clean atmosphere at 40°c (104°f) ambient temperature or less.
shaft diameter
(at face of bearing)
grease amount
(ounce)
0.8in to 1.2in
1.5g to 2.8g (0.05 to 0.1)
1.4in to 1.8in
3.1g to 5.7g (0.11 to 0.2)
enclosure insulation frames 143-215
frames 254+
2.0in to 2.2in
12.3g to 17g (0.43 to 0.6)
tefc
6 months
2.4in to 3.3in
32.8g to 45g (1.16 to 1.6)
f
not greasable
Frame sizes 143 through 215, inclusive have permanently
lubricated sealed bearings.
caution
Over-greasing is a major cause of bearing and motor
failure. Make sure that dirt and contaminants are not
introduced when adding grease.
note
Frequency shown above should be reduced by:
½ - For motors above 1800 rpm
½ - For heavy-duty, dusty locations.
L - For severe-duty, high vibration and shock
inverter duty application
type of grease
Please refer your application to Armstrong or its nearest
distributor for instruction.
Use Polyrex em Polyurea grease or equivalent unless special
grease is specified on the nameplate.
storage
procedure for relubrication
When re-greasing, stop the motor, remove outlet plug and add
amount of grease per reference table below, with hand level
gun only. Discontinue at once if grease appears at outlet plug.
This may occur before specified amount is used.
Run for about ten minutes before replacing outlet plug.
toronto
If the motor is not packaged for long-term storage and is not
to be put into service immediately, certain precautions should
be taken to protect it. If at all possible, place the motor under
cover in a clean and dry location.
During storage, the winding should be protected from excessive moisture absorption by some safe and reliable method
of heating. Space heaters, if supplied, may be used for this
purpose. The temperature of the winding should be always
maintained a few degrees above the temperature of the
surrounding air.
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+44 (0) 8444 145 145
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+44 (0) 8444 145 145
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