Installation

Hot Alignment

It is possible for the motor shaft height to change relative to the driven equipment and this should be compensated for during the alignment procedure. Heat from driven equipment can also cause horizontal misalignment.

WARNING

Rotating parts.

Can cause serious injury.

Disconnect and lock out power before working on equipment.

If motor application is abnormal (high temperature, extreme vibration, etc.) consult the factory for special instructions or additional information.

Check for vertical alignment (parallelism) of coupled drive as follows:

1.Operate unit until normal temperature is reached (may require several hours).

2.Shut down motor and lock out switch.

3.Mount dial indicator as in Figure 2.

4.Rotate shaft, noting readings at 0°, 90°, 180°, and 270° (both sides, top, and bottom). If within 0.002 inch total indicator reading, or other limit specified by the factory, unit is satisfactory for operation.

5.If not within limits, add or remove shims as required to raise or lower motor.

6.If shims are changed for high temperature operation, repeat alignment procedure to extent necessary to assure proper alignment. Document readings for warranty information.

Figure 2. Check of Vertical Alignment

Vibration

The standard unfiltered housing vibration limits measured at no load, uncoupled, and with rigid mounting are as follows based on the requirements of NEMA MG1-7.8.

Speed

Velocity, inches/sec peak

1200 – 3600 RPM

0.120

1000 RPM

0.105

900 RPM

0.096

750 RPM

0.079

720 RPM

0.075

600 RPM

0.063

After alignment is complete and foot mounting bolts are tight, run motor at no load (or minimum possible). Check for vibration. If excessive vibration exists and the alignment is acceptable, check foot plane by loosening one drive end-mounting bolt at a time as detailed below. This is to be documented for warranty information. When resiliently mounted, allowed levels are 25% higher.

Base or foundation rigidity can also affect vibration; check for resonance in supporting structure.

Recheck alignment after any change in shims and document alignment readings for warranty information.

Completing Mechanical Installation

After controlling rotor end float and establishing accurate alignment, it is recommended to drill and ream the foundation plate and motor feet together for dowel pins. (See Doweling).

Recheck parallel and angular alignment before bolting the coupling together. Motor shaft should be level within 0.03 inch after alignment.

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