Ge GEH-5304A User Manual download pdf (Page 19)

GEH-5304A

2. Noise and Vibration

Check for unusual vibration or noises that might indicate rubbing or interference.

Vibration of new machines at the bearing housings, as measured by a vibration meter, should not ex-

ceed the values shown in Table 8. (Measurements are according to NEMA MG 1-12.06 and MG 1-

12.07.)

The most likely cause of vibration in new machines is misalignment due to improper installation,

loose foot bolts, uneven shimming under feet, or damage to machine during shipment or installation.

Current ripple due to a rectified power supply may also be a source of vibration and audio noise.

Table 8

Maximum Amplitude

(in Inches)

RPM (Peak to Peak)

3000-4000 incl. .001

1500-2999 incl. .0015

1000-1499 incl. .002

999 and below .0025

3. Inspection After Short Time in Service

New machines may smell warm or have the odor of varnish, but should not smell scorched.

After a machine has been operating for a short time, an inspection should be made to ascertain that

there have been no changes since installation. Check for increased vibration, signs of change in

alignment or foundation settling, bolts that may have loosened, rubbing parts, loose connections and

worsened commutation. Proper steps must be taken to correct the trouble. Also, check the condition

of air filters on blower ventilated machines. The amount of dirt in the air varies widely between in-

stallations.

V. MAINTENANCE

High voltage electric shock may cause serious or fatal injury. Disconnect power

before touching any internal part. High voltage may be present even when the

machine is not rotating. If used with a rectified power supply, disconnect all AC

line connections to the power supply. With other power supplies, disconnect

all DC line and field connections. Also, disconnect power from auxiliary de-

vices.

Ground the machine properly to avoid serious injury to personnel. Grounding

must be in accordance with the National Electrical Code and consistent with

sound local practices.

Replace covers and protective devices before operating.

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Ge GEH-5304A User Manual Page 19