By Rex Miller
Whole, compact and that includes formulation, tables, and diagrams rather than long textual content descriptions, this convenient reference provides job-essential info in a brief look-up structure. the recent moment version has been up-to-date to incorporate the 2005 nationwide electric Code, new symbols for electric drafting now getting used in CAD drafting, extra insurance of co-axial cable in domestic wiring, and extra on electrical cars and controls.
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Extra resources for Electrician's Pocket Manual (Pocket References (McGraw-Hill))
B) Excessive greasing. (c) Wrong grease. (d) Solid contaminants. (e) Water running into motor. (f) Misalignment or closecoupledapplication. (g) Excessive belt tension. 43 (continued) 44 TABLE 3-3 Motor Troubleshooting Guide (continued ) Symptom Mechanical Noise Possible Causes Driven machine or motor noise. Motor noise ampliﬁed by resonant mounting. Driven machine noise transmitted to motor through drive. Misalignment on close-coupled application Correction Isolate motor from driven machine— check difference in noise level.
CHECKING AND MAINTAINING SMALL MOTORS • • • • • • Be sure there is adequate wiring. After a motor has been installed or transferred from one location to another, check the wiring. Be sure that adequate wire sizes are used to feed electric power to the motor; in many cases, replacing wires is all that is needed to prevent future breakdowns. Adequate wiring also helps to prevent overheating and reduces electric power costs. Check internal switches. Although switches usually give little trouble, regular attention will make them last longer.
High-resistance connections. Each phase lead run in separate conduits. Overload Relays Tripping Upon starting (Also see “Slow Starting”) Slow starting. (10–15 seconds or more) due to high inertia Load. Low voltage at motor terminals. (a) If the unbalanced current pattern follows the input power lines, the problem is in the power supply. (b) If the unbalanced current pattern follows the motor leads, the problem is in the motor. Correct the voltage balance of the power supply or replace the motor, depending on answer to (a) & (b) listed earlier.
Electrician's Pocket Manual (Pocket References (McGraw-Hill)) by Rex Miller