Jogging And Repeated Starts; Maintenance - Flowserve 5LR-15D Manual

Jea west nassau high service pumps

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If possible, turn the rotor by hand to be sure that it rotates freely.

Check all connections with the connection diagram. Check all accessible factory made connections for

tightness to make sure none has become loose during shipment.

When the driven load is likely to be damaged by the wrong direction of rotation, it is best to uncouple the

motor from its load during the initial start and make certain it rotates in the correct direction. If it is

necessary to change rotation, interchange any two line leads.

Some motors are designed for unidirectional rotation. Rotation of these motors must be in accordance

with the rotation indicated on the motor's nameplate and the outline furnished with the equipment.

Connection plates on the motor have been furnished to assist in obtaining the proper rotation.

After inspecting the motor carefully, make the initial start by following the regular sequence of starting

operations in the motor starter control instructions.

For sleeve-bearing machines, after starting verify that the oil rings are operating properly and that oil is

being fed to the shaft.

The temperature of the sleeve bearings, as measured by bearing temperature detectors, should not

exceed 93C (200F).

At initial start, the rate of rise of the bearing temperature is more indicative of trouble than is total

temperature. When starting a machine for the first time, the bearing temperature should be observed for

a minimum of 2 hours. If at any time the rate of temperature rise exceeds 2C/minute, shut down the

motor immediately and make an investigation of lineup conditions, and if necessary, the bearing and oil

ring assembly.

For anti-friction bearings check motor operation under load for an initial period of at least one hour to

observe whether any unusual noise or hot spots develop.

In the event of excessive vibration or unusual noise disconnect the motor from the load and check the

mounting and alignment.

10. Check the operating current against the nameplate value. Do not exceed the value of nameplate current

multiplied by the motor service factor (if any) under steady continuous load.

11. Space heaters should be de-energized during motor operation.

C. Jogging and Repeated Starts

CAUTION: Repeated starts and/or jogs of induction motors greatly reduce the life of the winding

insulation. The heat produced by each acceleration or jog is much more than that dissipated by the

motor under full load. If it is necessary to repeatedly start or jog a motor, it is advisable to check the

application with the local GE Energy sales office.

V. MAINTENANCE

WARNING: Before initiating maintenance procedures, disconnect all power sources to the motor

and accessories. For motors equipped with surge capacitors, do not handle the capacitors until

they are discharged by a conductor simultaneously touching all terminals

and leads, including earth. This discharge conductor should be insulated for handling. Replace all normal

grounding connections prior to operating.

GEI 56128-L

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