Drives Flashcards
Why would you speak to operations prior to working on a VFD?
To prevent process disruptions.
To understand the process proir to failure.
How would you find replacement or spare parts?
Look in warehouse inventory.
Contact our planning staff.
How would you determine the type of failure on a VFD or soft-start?
Interpret the fault code using the vendor documantation.
Where do you find the definition of a fault code?
In the device’s instruction manual.
Why would you need a multimeter to troubleshoot a drive?
Check supply voltage.
Check for shorts.
Check for control signal.
Verify contact position.
What is a loop calibrator used for when trouble-shooting a VFD?
To verify that the input signal is present and is correct.
When do you need to LOTO a VFD?
After trouble-shooting, maintenance activities may require conductor contact.
Are broken components repaired or replaced?
Replaced.
How do you verify that repairs where succesful?
Consult vendor documantation for testing procedures.
Test the unit by driving the output.
Wht is it important to verify all parameters before replacing a component on a VFD?
Process disruption or equipment damage could result from incorrect VFD settings.
What does VFD stand for?
Variable Frquency Drive.
What is another name for a VFD?
VSD. Variable Speed Drive.
What is the difference between a VFD and a Soft Start?
A VFD is used to vary the speed of the drive continually, a Soft Start brings the motor up to full load amps slowly.
How are VFDs controlled?
Process control equipment like PLCs.
Can you run the input and output line voltage wiring in the same conduit? Why?
No. To avoid induction from the primary to the secondary.
