R7515 fan speed at 100% when connecting the 12x 3,5' backplane

Question

Hello everyone. I purchased the R7515 server. When the operating system starts, the cooling system works at 100%. When I disconnected the empty front panel for disks (not a single disk is installed, there are plugs), the fan speed dropped to 60%. What could be the problem? 6 Nidec UltraFlo V60E12BS1M3-H4286-A00 coolers are installed. I would be grateful for any ideas and help!

Dell-Martin S · Accepted Answer

For such information you need to sign a NDA and request this from your salesman

DELL-Chris H · Answer

Hbadger69,

Dell servers use thermal and inventory-based fan control logic managed by iDRAC. When the system detects:

A connected backplane without recognized drives

Or non-Dell certified drive blanks or missing blanks

It may interpret this as a cooling risk, triggering maximum fan speed to protect system components

To answer why fan speed drops when the backplane is disconnected

Disconnecting the backplane removes the thermal zone associated with the drive bays.

iDRAC no longer monitors that zone, so it reduces fan speed based on remaining active zones.

Let me know if this helps.

Hbadger69 · Answer

@DELL-Chris H ​ Could you please tell me what the minimum speed in the cooling settings depends on? At the moment it is 36-100%, is it possible to lower the minimum

Dell-Martin S · Answer

Hi, Sure you could have a lower Fan speed.

Hbadger69 · Answer

@Dell-Martin S​  Could you please tell me what markings should be on the fans from the factory assembly?

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R7515 fan speed at 100% when connecting the 12x 3,5" backplane

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