Derrick’s shale shakers are designed expressly for removal of drilling solids from drilling fluid.
Derrick shaker vibrator motors run with higher surface temperatures than standard industrial motors. But there are still have downtime on tough conditions or improper operation.
The troubleshooting procedures presented in the following chart are designed to assist in fault isolation and correction of defects in the Derrick vibrator motor.
| Trouble | Possible Cause | Corrective Action |
|---|---|---|
| Motor fails to run | Incorrect voltage | Check that supply voltage agrees with motor data plate. If correct, check fuses / circuit breakers. Using a voltmeter, check for correct supply power to all three phases at starter(s). Using a voltmeter, verify that motor starter is functioning properly and terminals T-1, T-2, and T-3 are energized. Check for damage to power cable connected to motor junction box. Correct all defects. |
| Incorrect power supply connections | Check electrical connections, and correct any defects. | |
| Starter circuit overloads and trips | Incorrect supply voltage | Check that supply voltage agrees with motor data plate. |
| Incorrect thermal overload | Check that thermal overload is capable of handling full load current. Replace overload, if inadequate (see motor data sheet for load data). | |
| Mounting hardware loose | Check that mounting hardware is properly tightened. | |
| Vibrating motion of motor and related components are restricted. | Check that shipping brackets have been removed or disengaged as required. Check condition of float mounts. Verify that solids are not preventing motion of the screen frame. Correct all defects. | |
| Excessive current draw | Incorrect supply voltage | Verify that supply voltage agrees with motor data plate. |
| Incorrect thermal overload | Check that thermal overload is capable of handling full load current. Replace overload, if inadequate (see motor data sheet for load data). | |
| Mounting hardware loose | Check security of mounting hardware. Tighten as required. | |
| Vibrating motion of motor and related components restricted | Verify that shipping brackets have been removed / disengaged as required. Verify that float mounts are in good condition. Verify that solids are not preventing motion of the shaker screen frame. Correct all defects. | |
| Surface temperature too high | Excessive buildup of process material on motor case | Wash off buildup from motor case. |
| Excessive noise | Loose hardware | Check security of all external and internal hardware. Tighten as required. |
| Defective bearing | Replace both bearings in accordance with Bearing Replacement. |
|
| Motor turns too slowly | Incorrect supply voltage or line frequency | Check that supply voltage and line frequency agree with motor data plate. Frequency must be within ±1Hz. |
| Motors not synchronized (dual motors only) | No electric power to one motor | Check that supply voltage is connected to both motors. |
| Incorrect electrical connections | Confirm that electrical connections are in accordance with the instructions in this section. |
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May 30, 2020 at 6:17 am[…] Derrick Shaker’s Motor Troubleshooting […]