Frequently Asked Questions
10
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The fan is triggered by temperature. The dock fan will not rotate until the dock is hot enough to trigger a thermal threshold.
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Vice versa, if your dock is not cool enough, the fan will not stop even when you disconnect the dock from the system.
1. The fan is not working after connecting with the system.
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When you hear a loud fan noise, it is warning you that the dock is in some kind of a hot condition. For example, the vent in
the dock may be blocked or the dock is working in a high working-temperature environment (> 35C), etc,. Please eliminate
these abnormal conditions from the dock. If you do not eliminate the abnormal condition, in a worst-case situation, the
dock will shut down through the over-temperature protection mechanism. Once this happens, please un-plug the USB
Type-C cable from the system and remove the dock’s power. Then wait 15 seconds and plug in the dock power to recover
the dock back online.
2. The dock does not work after high-speed fan noise.
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When plugging in the AC adapter and powering on the docking station, the fan turns on for sometime and subsequently
powers down. This is by design and the docking station is working as expected.
3. I hear a fan noise when I plug in the dock’s AC adapter.
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The fan is designed to run at five different speeds based on the dock's activity level or work load. The fan usually runs at
the lowest speed setting until the dock reaches a thermal threshold due to the workload on it. The fan may then run at one
of its two high-speed settings as described in the table below:
4. I hear a loud fan noise. What’s wrong?
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The Dell Universal Dock UD22 can charge your mobile or power bank even without being connected to the system. Just
make sure your dock is connected to external power. The dock fan will rotate automatically if the dock gets too warm. This
is normal working condition.
5. What is the charging station feature?
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When a new device is plugged in, the USB hub driver notifies the Plug and Play (PnP) manager that a new device was
detected. The PnP manager queries the hub driver for all of the device's hardware IDs and then notifies the Windows OS
that a new device needs to be installed. In this scenario, the user will see a hardware installation window.
For more details, See Microsoft articles.
https://msdn.microsoft.com/en-us/windows/hardware/drivers/install/identifiers-for-usb-devices
6. Why does the hardware installation window show up when I plug in a USB device to the docking stations ports?
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Your Dell dock is designed to operate on AC power only and it does not support system power source back (powered by
system USB Type-C port). A power loss event will make all devices on the dock fail to work. Even when you restore the AC
power, the dock may still not function properly because the dock still needs to negotiate proper power contract with the
system's USB Type-C port and establish a system EC-to-dock EC connection.
7. Why do the peripheral devices, which are connected to the dock station, become unresponsive after recovering
from a power loss?
State
State name
Fan speed (rpm)
0
Fan off
0
1
Fan minimum
3000
2
Fan low
3500
3
Fan medium
4200
4
Fan medium-high
4700
5
Fan high
5100
Frequently Asked Questions 25
