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Alarm Name
Trigger Condition
Clearance Condition
Recommended
Corrective Action
Over Temperature
Currently not implemented
Under Temperature
Currently not implemented
High Current
Currently not implemented
1 – For a satellite to be considered usable as a time source it must:
• be a GNSS satellite
• be in an enabled constellation (configurable)
• have a Signal to Noise Ratio (SNR) exceeding the SNR threshold (configurable)
• be positioned in the sky within the mask angle (configurable).
2 – Maximum inaccuracy thresholding and holdover timeout are both configurable. By default, no maximum
inaccuracy thresholding and a 60s holdover timeout are used.
3 – IRIG input signal requirements:
• TTL signal over copper
• 0V logic low (±0.4 V) to 5V logic high (±1 V)
• DCLS IRIG-B
• Includes C37.118.1 Extensions.
Note:
If any alarm persists after corrective action, please contact Microchip technical support.
11.5
Antenna Installation Troubleshooting
This section describes how to troubleshoot issues with the GridTime 3000's antenna installation.
To troubleshoot an antenna installation perform the following steps:
1.
Check that the antenna has a good view of the sky.
2.
Check the antenna installation for a short circuit. This can be done by following the steps found in
article.
3.
Ensure the antenna installation is compatible with the
12.8. GNSS Receiver Specification
.
4.
If none of these steps resolve the issue, contact Microchip technical support.
11.6
Power Supply Fuse Replacement
This section describes how to replace the fuse on a GridTime 3000 power supply.
DANGER
Remove power to all of the GridTime 3000's power supplies, wait a few minutes for the power supply
capacitors to discharge fully
1.
Remove the power supply bay lid compartment screws highlighted in the image below.
Maintenance and Troubleshooting
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2022 Microchip Technology Inc.
and its subsidiaries
Manual
DS00004572A-page 226