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ME60 Troubleshooting Guide V1.0 (VRPv8)

This document provides the maintenance guide of the device, including daily maintenance, emergence maintenance, and typical troubleshooting.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Handling High Temperature Issues for devices

Handling High Temperature Issues for devices

Since devices have been applied on the live network in a large scale, high temperature issues occur frequently because the installation environment at the site is poor and customers lack of maintenance skills. The high temperature issues will severely affect network running if not being handled timely.

High Temperature Impact

The high temperature increases the failure rate and reduces the lifetime of a device, increasing OPEX. The high temperature also leads to noise which is harmful.

Increasing Device Failure Rate

Failure rate refers to the inherent failure probability of a component in its lifecycle.

Within its working temperature, the failure rate is stable. However, if the working temperature is excessively high, the failure rate increases exponentially with the temperature increase, as shown in the following figure.

When calculating the mean time between failures (MTBF) under various temperature, Huawei adopts the SR332 standard that is universal in North America.

Increasing Device Noise
Noise of devices comes from the rotating fan. The fan rotates in a high speed when the temperature is high and generates much noise.
NOTE:
The fans configured for devices adopt the intelligent speed mode. In other words, the fan speed is dynamically adjusted depending on the ambient temperature to stabilize the board temperature within its working temperature range.

High Temperature Cause

This section describes how to analyze the high temperature causes in installation and maintenance.

Improper Device Installation
  1. Since devices are installed in a non-standard equipment room, the ambient temperature rises with the outdoor temperature.
  2. Devices are not well ventilated, causing poor heat dissipation.
Improper Device Maintenance
  1. The dustproof is not cleaned timely.
  2. The fan is faulty and is not replaced timely.
  3. The air conditioners for the equipment room are faulty or powered off.
  4. The porosity rate of the cabinet door is less than 50%. A small porosity rate adversely affects heat dissipation.
  5. No filler panel is installed in vacant slot.

High Temperature Solution

This section describes solutions to the high temperature problem during installation and maintenance.

Solution to Improving Device Installation

Ensure that the devices are installed in an equipment room equipped with air conditioners. For details, see Device Operating Environment Requirements in the product manual.

Solution to Improving Device Maintenance
  1. Clean the dustproof of air filters every three months.
  2. If a fan is faulty, replace the fan timely.
  3. Repair the air conditioner after it is faulty or powered off.
  4. Install a filler panel in each vacant slot.

Workaround and Preventive Measure

This section describes how to handle high temperature alarms and how to prevent the high temperature.

Workaround
  1. Check whether the fan mode is set to auto using the NMS. If not, set the fan mode to auto.
  2. Check whether a high temperature alarm persists on the NMS. If yes, go to 3.
  3. Apply for a time window and go to the site to perform the following check. Take one set of fan spare parts and tools for cleaning the air filters.
  4. Check whether the air conditioners work properly. Measure the ambient temperature.

    Ensure the air conditioners work properly and the ambient temperature is lower than the running temperature required by the device.

  5. Check whether a fan alarm is reported using the NMS. If yes, replace the fan.
  6. Check whether the air ducts of the device are blocked. If yes, clear the obstacles.
  7. Check whether the porosity rate of the cabinet door is greater than 50%. If not, uninstall the air filter of the cabinet door.
  8. Clean the air filter following air filter cleaning instructions.
  9. Check whether other alarms are reported using the NMS. If yes, contact a technical support engineer.
Preventive Measure
  1. Perform preventive maintenance inspection (PMI) on NEs to find highly risky NEs that meet the following conditions:
    • The fan speed is high.
    • The fan is faulty or not online.
    • A high temperature alarm is reported.
    • The fan mode is not set to auto.
  2. Perform the following operations to check faults for these risky NEs:
    • Check whether the fan assembly in the subrack functions properly. If not, replace the fan assembly.
    • Check whether the air conditioners function properly. If not, repair the air conditioners.
    • Check whether the equipment room temperature is higher than the running temperature required by the device. If yes, lower the equipment room temperature.
    • Check whether the air ducts on both sides of the device are blocked. If yes, clean the air ducts.
    • Check whether the air filters are blocked. If yes, clean the air filters.
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Updated: 2019-06-11

Document ID: EDOC1000175918

Views: 14654

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