11371757 Installation, operation and maintenance manual – Squirrel cage motor – M line – Vertical
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7.9.4.8.2
Guide bearing (lower)
The lower guide bearing function is to provide the radial
location of the motor shaft without load or axial
displacement limitation.
Figure 7.10: Lower guide bearing
Figure 7.10 legend:
1.
Bearing housing
2.
Serpentine
3.
Fittings for cooling water
4.
Stand pipe
5.
Stand pipe seal
6.
Runner
7.
Bearing shell
8.
Thermoresistance (optional)
9.
Cover
10.
Radial segment
11.
Double seal
Before disassembling:
Drain the oil thoroughly from the bearing;
Thoroughly clean the external part of the bearing;
Remove the temperature sensors;
Remove the grounding brush (if any);
Uncouple the motor and place it in the horizontal
position.
Disassembly
Remove the screws that fix the bearing lower cover and
remove it;
Disassemble the bearing following the manufacturer
manual instruction.
Assembly
In order to assemble the bearing, follow the disassembly
procedures in the reverse order.
7.9.5
Bearing protection
7.9.5.1
Protection settings
ATTENTION
The following temperatures must be set on
the bearing protection system:
Alarm 110 ºC – Trip 120 ºC
The alarm temperature must be set 10 ºC
above the operating temperature, not
exceeding the limit of 110 ºC.
7.9.5.2
Disassembly/assembly of the sleeve
bearing temperature sensors
Figure 7.11: Pt100 on the bearings
Figure 7.11 legend:
1.
Reduction nipple
2.
Insulating adapter
3.
Locknut
4.
Bulb
5.
Flexible metal tube
6.
Pt-100 temperature sensor
7.
Non-insulated bearing
8.
Insulated bearing
Disassembly instructions:
If it is necessary to remove the Pt100 for bearing
maintenance, proceed according to the following
instructions:
Remove the Pt100 carefully, locking the locknut (3), and
unscrewing just the Pt100 from the bulb (4);
Parts (2) and (3) must not be disassembled.
Assembly instructions:
ATTENTION
Before assembling the Pt100 on the
bearing, check if it does not contain marks
of knock or any other damage that may
compromise its operation.
Insert the Pt100 into the bearing;
Restrain the locknut (3) with a wrench;
Screw it in the bulb (4), adjusting it so that the tip of the
Pt100 touches the outer surface of the bearing.
NOTES
The assembly of the Pt100 on non-
insulated bearings must be done directly
on the bearing, without the insulating
adapter (2);
The tightening torque to assemble the
Pt100 and the adapters must not exceed
10Nm.
1
5
4
7
10
9
3
6
11
2
8
