What causes a motor to draw higher than normal amps | AMP

At least 80% of the time when current draws high current at our plant it is due to the pump or fluid system. Now an intriguing piece of information in your case …

Grinding Mills - an overview | ScienceDirect Topics

The circuit comprises a SAG mill, 12 m diameter by 6.1 m length (belly inside liners, the effective grinding volume), two pebble crushers, and two ball mills in parallel closed with cyclones. The SAG mill is fitted with a 20 MW gearless drive motor with bi-directional rotational capacity. (Reversing direction evens out we liners with ...

Dial Indicator Alignment Basics - Alignment Knowledge

Dial Indicator Alignment Basics Dial indicators are measuring devices designed expressly to measure relative position. The primary parts of a dial indicator are the face or dial, the case, and the plunger. The plunger is a spring loaded part that can be depressed into …

Voltage sag - Wikipedia

Since electric motors draw more current when they are starting than when they are running at their rated speed, starting an electric motor can be a reason of a voltage sag. When a line-to-ground fault occurs, there will be a voltage sag until the protective switch gear operates.

motor current spike | Mike Holt's Forum

All: What would cause a spike in the running current of a 3 phase motor? The motor in question is 5000 hp, 4 kV and powers a fan. It will be running along just fine pulling around 570 amps, then suddenly spike to about 630 amps for a second or two, then return to normal for hours before doing it again.

Flickering Lights & Electrical Power Loss Diagnose & Repair

A likely cause of this problem is a failing appliance or motor that is drawing abnormally high current as we cited in step 3. But sometimes the problem may occur only at lights or appliances plugged-in electrically "downstream" from a specific electrical circuit, or at lights operated by a specific switch.

PDF Flicker Analysis and Case Studies

voltage sag - usually only a few volts on 120-V system Noticeable at low levels and downright annoying ... Large motor draws 25-MW and 40-MV startup. With a system Thevenin equivalent Of Z= 0.988% +j 7.170% (100-MVA base), What is the ... High System Impedance 3. Repeat variations until annoying. 9 Component 1:

Bearing Current Problems: Causes, Symptoms, and Solutions | EC&M

Across-the-line powered motors. The most common underlying cause of unwanted bearing currents in sine wave-driven motors is alternating flux, which is a result of asymmetric magnetic properties of the stator or rotor core. Fig. 1. In this sine wave powered motor, bearing currents result from time-varying flux encircling the motor shaft.

Milling - Energy intensive and high maintenance

THE LOW SPEED MOTOR SOLUTION Due to the high torque required by the mill, low speed motors are generally synchronous machines. The mill is a low dynamic system therefore a brushless synchronous machine is best suited for this application. Brushless synchronous motors have no wearing parts, and the AC/ AC excitation power is kept small.

5 Causes of Motor Failure and How to Prevent Them

Also, when laying out the workspace, try to position motors away from grinding machines which produce large amounts of contaminants. 5. Vibration. Vibration can lead to many issues with the motor, and can eventually cause the motor to fail prematurely. Vibration is often caused by the motor being positioned on an uneven or unstable surface.