2024 Variable Frequency Drive Test

What 2 fan speeds and Hertz will a SAV unit operate at?

50% / 30hz and 100% / 60hz

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66% / 40hz and 100% / 60hz

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70% / 40hz and 100% / 60hz

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100% / 100hz

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All SAV units have 2 compressors? True or False

True

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False

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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

Correct Incorrect Correct answer

ONLY LC series units will come with a keypad for the VFD

Correct Incorrect Correct answer

Only the new EcoBlue units come with a keypad for the VFD

Correct Incorrect Correct answer

Motors controlled by a VFD are DC voltage motors?

True

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False

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How does the VFD get it’s signal to tell the blower motor what speed to operate at?

The IGC board

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The signal from the thermostat

Correct Incorrect Correct answer

Fan speed relay board

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It is based on the cooling/heating demand

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On the Fan Speed Relay Board, what are the “J1” inputs?

24vdc inputs from the thermostat

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24vac inputs from the thermostat

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24vdc outputs to the thermostat

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24vac outputs to the thermostat

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“JW1” and “JW2” jumpers on the fan speed relay board must always stay intact and never be cut? True or False

True

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False

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A “Fan only” call from the thermostat will operate the blower at what speed?

30%

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45%

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50%

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66%

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The AEGIS grounding ring is always external of the motor? True or False

True

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False

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When ordering a replacement motor on a SAV unit__________.

As long as the HP, Voltage and RPMS match, it's OK

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Should always be ordered as OEM as they are special motors

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Will be OK as long as the specs are close to the original motor

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Any ECM Motor will work

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All ABB replacement VFD’s will come with a keypad?

True

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False

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Replacement VFD’s come pre-programmed when you order it using your serial number?

True

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False

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In order to program your replacement VFD you must_________?

Know your motor part number

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Know your VFD part number

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Have the current literature VFD-10Si or IIVFD-10

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Call technical support for programming

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Nothing additional is needed as long as the serial number was used when ordered

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Call ABB/Danfoss for programming

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When changing rotation of the motor you must _______ ?

Turn power off

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Change in the parameter setup

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Change rotation at your motor connections on the VFD

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It's OK as long as it moves enough air

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It is OK to use the “Startup Assist” function when you power the drive up?

True

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False

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When viewing VFD faults in the “fault logger”, you can__________?

View up to 10 faults

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View the last 3 faults after a power cycle

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View ONLY active faults

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Not view any faults

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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

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Restore the VFD back to factory settings

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View the changed parameters log

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Call the previous technician

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Replace the VFD again

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When changing parameters on your VFD, it must be on _________ mode.

Hand

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Auto

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Off

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Fan only

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If you have a VFD failure, it is OK to temporarily bypass it until you get a replacement?

True

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False

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It is OK to ignore your smoke detector circuit when you bypass a VFD?

True

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False

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What 2 fan speeds and Hertz will a SAV unit operate at?

50% and 100%

Correct Incorrect Correct answer

66% and 100%

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70% and 100%

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64% and 100%

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When replacing a roof top unit it is important to know what type of power supply you have?

True

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False

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Based on the diagram, what speed will the blower be operating at?

High speed @ 75%

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Low speed @ 50%

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High speed @ 100%

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Low speed @ 66%

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How does the VFD get it’s signal to tell the blower motor what speed to operate at?

The IGC board

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Fan speed relay

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Fan speed relay board

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Low speed @ 66%

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Your VFD keypad must always be left on the VFD for proper operation?

True

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False

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Your VFD keypad must always be left on the VFD for proper operation?

True

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False

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Which is the correct macro the VFD MUST be set to?

HVAC

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Supply Fan

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Return Fan

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Hand Control

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It is OK to download parameters from one RTU and upload to another one?

Yes, as long as the VFD's are the same

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No, this should NEVER be done

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Yes, as long as the RTU model numbers are the same

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No, the keypads are specific to the drive it came with

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Voltage supply must be within _____% tolerance in order for the VFD to operate correctly as well as eliminate nuisance faults.

2%

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5%

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7%

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10%

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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

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Yes, shouldn't have any problems

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Yes, as long as you install a Delta-Wye transformer to provide 3 equal legs of power to the VFD

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It is not recommended

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