2024 Variable Frequency Drive Test

2024 Variable Frequency Drive Test

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Question 1 of 30

1. Question
What 2 fan speeds and Hertz will a SAV unit operate at?
- 50% / 30hz and 100% / 60hz
- 66% / 40hz and 100% / 60hz
- 70% / 40hz and 100% / 60hz
- 100% / 100hz
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Question 2 of 30

2. Question
All SAV units have 2 compressors? True or False
- True
- False
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Question 3 of 30

3. Question
All units that have a VFD will always come with a keypad to control the VFD?
- All new RTU's come with a keypad for the VFD
- ONLY LC series units will come with a keypad for the VFD
- Only the new EcoBlue units come with a keypad for the VFD
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Question 4 of 30

4. Question
Motors controlled by a VFD are DC voltage motors?
- True
- False
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Question 5 of 30

5. Question
How does the VFD get it’s signal to tell the blower motor what speed to operate at?
- The IGC board
- The signal from the thermostat
- Fan speed relay board
- It is based on the cooling/heating demand
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Question 6 of 30

6. Question
On the Fan Speed Relay Board, what are the “J1” inputs?
- 24vdc inputs from the thermostat
- 24vac inputs from the thermostat
- 24vdc outputs to the thermostat
- 24vac outputs to the thermostat
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Question 7 of 30

7. Question
“JW1” and “JW2” jumpers on the fan speed relay board must always stay intact and never be cut? True or False
- True
- False
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Question 8 of 30

8. Question
A “Fan only” call from the thermostat will operate the blower at what speed?
- 30%
- 45%
- 50%
- 66%
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Question 9 of 30

9. Question
The AEGIS grounding ring is always external of the motor? True or False
- True
- False
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Question 10 of 30

10. Question
When ordering a replacement motor on a SAV unit__________.
- As long as the HP, Voltage and RPMS match, it's OK
- Should always be ordered as OEM as they are special motors
- Will be OK as long as the specs are close to the original motor
- Any ECM Motor will work
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Question 11 of 30

11. Question
All ABB replacement VFD’s will come with a keypad?
- True
- False
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Question 12 of 30

12. Question
Replacement VFD’s come pre-programmed when you order it using your serial number?
- True
- False
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Question 13 of 30

13. Question
In order to program your replacement VFD you must_________?
- Know your motor part number
- Know your VFD part number
- Have the current literature VFD-10Si or IIVFD-10
- Call technical support for programming
- Nothing additional is needed as long as the serial number was used when ordered
- Call ABB/Danfoss for programming
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Question 14 of 30

14. Question
When changing rotation of the motor you must _______ ?
- Turn power off
- Change in the parameter setup
- Change rotation at your motor connections on the VFD
- It's OK as long as it moves enough air
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Question 15 of 30

15. Question
It is OK to use the “Startup Assist” function when you power the drive up?
- True
- False
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Question 16 of 30

16. Question
When viewing VFD faults in the “fault logger”, you can__________?
- View up to 10 faults
- View the last 3 faults after a power cycle
- View ONLY active faults
- Not view any faults
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Question 17 of 30

17. Question
If someone previously worked on the VFD you are looking at and are unsure of what they may have changed, you can always ___________
- Call tech support to find out what was changed
- Restore the VFD back to factory settings
- View the changed parameters log
- Call the previous technician
- Replace the VFD again
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Question 18 of 30

18. Question
When changing parameters on your VFD, it must be on _________ mode.
- Hand
- Auto
- Off
- Fan only
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Question 19 of 30

19. Question
If you have a VFD failure, it is OK to temporarily bypass it until you get a replacement?
- True
- False
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Question 20 of 30

20. Question
It is OK to ignore your smoke detector circuit when you bypass a VFD?
- True
- False
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Question 21 of 30

21. Question
What 2 fan speeds and Hertz will a SAV unit operate at?
- 50% and 100%
- 66% and 100%
- 70% and 100%
- 64% and 100%
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Question 22 of 30

22. Question
When replacing a roof top unit it is important to know what type of power supply you have?
- True
- False
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Question 23 of 30

23. Question
Based on the diagram, what speed will the blower be operating at?
- High speed @ 75%
- Low speed @ 50%
- High speed @ 100%
- Low speed @ 66%
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Question 24 of 30

24. Question
How does the VFD get it’s signal to tell the blower motor what speed to operate at?
- The IGC board
- Fan speed relay
- Fan speed relay board
- Low speed @ 66%
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Question 25 of 30

25. Question
Your VFD keypad must always be left on the VFD for proper operation?
- True
- False
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Question 26 of 30

26. Question
Your VFD keypad must always be left on the VFD for proper operation?
- True
- False
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Question 27 of 30

27. Question
Which is the correct macro the VFD MUST be set to?
- HVAC
- Supply Fan
- Return Fan
- Hand Control
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Question 28 of 30

28. Question
It is OK to download parameters from one RTU and upload to another one?
- Yes, as long as the VFD's are the same
- No, this should NEVER be done
- Yes, as long as the RTU model numbers are the same
- No, the keypads are specific to the drive it came with
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Question 29 of 30

29. Question
Voltage supply must be within _____% tolerance in order for the VFD to operate correctly as well as eliminate nuisance faults.
- 2%
- 5%
- 7%
- 10%
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Question 30 of 30

30. Question
It is OK to have a RTU with a VFD installed on a building with a wild leg in it’s power supply?
- Not at all
- Yes, shouldn't have any problems
- Yes, as long as you install a Delta-Wye transformer to provide 3 equal legs of power to the VFD
- It is not recommended
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