Installation & Operation 2-3
MN409
Lubrication
The lubrication system should be checked in preparation for rotating the shaft during the alignment
operation.
Anti
−
Friction Bearings (Grease Lubricated)
Bearing chambers are packed with grease during assembly, and do not normally need additional grease
at time of installation, unless the unit has been in storage and installation for 6 months or longer.
Lubricant must be added per Section 4, Maintenance.
Sleeve Bearing (Oil Lubricated)
If the motor has been in storage for six months or more, the bearing oil must be changed per Section 4 for
Standard Conditions.
Sleeve bearing motors are shipped from factory without oil. Fill oil sumps to proper level before rotating
the shaft. Failure to observe this precaution could result in damage to or destruction of the equipment.
To fill sleeve
−
bearing motor oil reservoirs on motors not equipped with constant level oilers, be sure that
the drain plugs are in place and secure. Fill through filler cap until oil level shows in the oil gauge. Fill oil
to midway point of the gauge. For motors with constant level oilers, refer to the instructions under the
Accessories section.
On motors equipped with circulating oil lube system and adjustable needle valve, valve must be adjusted
or flooding of oil sump may occur. Disconnect valve and adjust to flow rate, pressure, and temperature as
defined on dimension sheet or nameplate. If dimension sheet is not available contact your Baldor District
Sales Office.
Electrical Connection
WARNING:
Be sure the system is properly grounded before applying power. Do not apply AC power
before you ensure that all grounding instructions have been followed. Electrical shock can
cause serious or fatal injury. National Electrical Code and Local codes must be carefully
followed.
A main terminal box may be provided for power lines to the stator. Other terminal boxes for all other
electrical connections may be provided. Motor and control wiring, overload protection, disconnects,
accessories and grounding should conform to the National Electrical Code and local codes and practices.
AC Power
Connect the motor leads as shown on the connection diagram located on the name plate or inside the
cover on the conduit box. Be sure the following guidelines are met:
1.
AC power is within
±
10% of rated voltage with rated frequency. (See motor name plate for ratings).
OR
2.
AC power is within
±
5% of rated frequency with rated voltage.
OR
3.
A combined variation in voltage and frequency of
±
10% (sum of absolute values) of rated values,
provided the frequency variation does not exceed
±
5% of rated frequency.
Grounding
Failure to properly ground the motor may cause electrical shock hazard to personnel.
All large motors should be grounded with the grounding conductor equipped with a brazed copper
terminal, or with a suitable solderless terminal fastened to the motor. Soldered terminals should not be
used. A washer should be used between bolt head and terminal lug. The other end should be fastened
with suitable clamps or terminals to rigid metallic conduit or to the nearest available ground. Grounding
conductor size should be in accordance with the following National Electrical Code Table 250
−
95.
Installation restrictions are listed in Section 250
−
92.
This Manual:http://www.manuallib.com/baldor/mn409-large-ac-motors-handbook.html
