Friday, November 24, 2017

Electrical Repair Services

1/100-1000 HORSEPOWER

Hoist & Lift Repair



ABC Electric Corp. is the largest service center for hoists and material lifts on the East Coast. Our factory trained mechanics will repair and refurbish your equipment and have it operating like new. We guarantee it. That's why we use only manufacturers original replacement parts and we back up every repair with a one year warranty on our labor and material. Here are a few more reasons to let us keep your jobs running smoothly: 

ABC is the only factory authorized warranty and repair center in N.Y.C. for Sumner Mfg
Large stock of new units and repair parts
Quick turn around times
Free estimates
Knowledgeable sales & service staff to answer your questions


Load Testing Program:

Per OSHA regulation, all new cranes or cranes which have been extensively repaired and/or altered in any way should be tested to confirm the load rating of the crane, with test reports readily available for inspection. ABC Electric Corp. has the Certified Weight Testing Equipment and the experienced personnel to perform the required tests in house or on your premises, and prepare the required certification reports. In addition, every hoist repaired or rebuilt by our factory authorized service organization is load tested and documented in compliance with OSHA regulations:

The system must be tested with a load of 125% of rated capacity.
-Per OSHA Par. 1910.179
The hoist hook must be magnetic particle tested each year.
-Per ASTM A275-83


Motor Repair



Failures in Three-Phase Stator Windings

The life of a three-phase stator winding can be shortened dramatically when the motor is exposed to unfavorable operating conditions -electrical, mechanical or environmental. The winding failures illustrated in this pictures are typical of what can happen in such circumstances. They are shown here to help in identifying the causes of failure, so that, where possible, preventive measures may be taken.


1.Winding Single-Phase (Y - Connected)

2.Winding Single-Phase (delta - connected)

3.Winding Shorted Phase-to-Phase

4.Winding Shorted Turn-to-Turn

5.Winding with Shorted Coils

6.Winding Grounded at Edge of Slot

7.Winding Grounded in Slot

8.Shorted Connection

9.Phase Damage Due to Unbalance Voltage

10.Winding Damage Due to Overload

11.Damage Caused by Locked Rotor

12.Winding Damaged by Voltage Surge

Photo: 1 & 2A single-phased winding failure is the result of an open in one phase of the power supply to the motor. The open is usually caused by a blown fuse, an open contactor, a broken power line or bad connections.


Photo: 3,4,5,6,7 & 8 These photos illustrate insulation failures that typically are caused by contaminants, abrasion, vibration or voltage surge.


Photo: 9 Thermal deterioration of insulation in one phase of the stator winding can result from unequal voltage between phases. Unequal voltages usually are caused by unbalanced loads on the power source, a poor connection at the motor terminal, or a high resistance contact (weak spring).
NOTE: A one-percent voltage unbalance may result in a six-to ten-percent current unbalance.


Photo: 10 Thermal deterioration of the insulation in all phases of the stator winding typically is caused by load demands exceeding the rating of the motor.
NOTE: Under-voltage and over-voltage (exceeding NEMA standards) will result in the same type of insulation deterioration.


Photo: 11 Severe thermal deterioration of the insulation in all phases of the motor normally is caused by very high currents in the stator winding due to a locked rotor condition. It may also occur as a result of excessive starts or reversals.


Photo: 12 Insulation failures like this usually are caused by voltage surges. Voltage surges are often the result of switching power circuits, lightning strikes, capacitor discharges and solid-state power devices.