Ge GEH-5304A User Manual download pdf (Page 8)

GEH-5304A

B. Mounting

Motors and generators should be mounted on rigid and solid foundations. Level the base (or the machine).

Hold-down bolts should be inspected regularly and kept tight. The feet of the machine may be doweled to

the foundation plates or base when alignment procedures are completed. Sliding bases, when used, should

be securely anchored to the foundation.

Motors are mechanically suitable for mounting with shaft horizontal or vertical on floor, ceiling or sidewall.

When sidewall or ceiling mounted, special provisions must be made to maintain the integrity of dripproof

enclosures.

When motor is sidewall or ceiling mounted, lifting points in addition to the

standard lifting lugs may be required. Lifting, in these cases should be done by

experienced riggers to avoid injury to personnel and damage to the motor.

C. Alignment

Be sure to align or check alignment carefully on either motors or motor genera-

tor sets. Misalignment can cause excessive vibration and damaging forces on

shafts and bearings.

Time taken to assure good alignment will be returned in reduced downtime.

1. Coupled Drive

When a motor is used to drive a unit, flexible couplings must be used to facilitate alignment. Three-

bearing construction requires a rigid coupling.

Careful alignment of machines when using either solid (rigid) or flexible cou-

plings is essential to prevent excessive vibration and bearing or shaft failures.

Before grouting the base, the coupling should be checked as follows:

1. Slide the sleeve from the coupling so that the hub faces are exposed.

2. Check that the coupling hub spacing is in accordance with the outline dimensions with

the units in the mechanical center of their end play.

3. Check parallel alignment by using a straightedge across the hubs at both vertical and

horizontal locations, or by clamping a dial indicator to one hub and indicating the other

hub on its outside diameter. Be sure that the dial indicator supports do not bend or sag,

since this will give inaccurate readings.

4. Use a dial indicator at hub faces and rotate both units together 90°, 180°, 270° and 360°

or measure the gap at each position by inserting a feeler gage. The reading should not

vary more than 0.002”.

5. Correct any vertical misalignment by shimming between the base and the foundation.

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Ge GEH-5304A User Manual Page 8