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Installation and Operation Manual
X-VAP-VDM300-eng
Part Number: 541B210AAG
Brooks
VDM300 Vapor Delivery Module
®
October, 2018
4-3 Troubleshooting the VDM300
The VDM300 is not intended to be serviceable by the customer. ln some
instances, however, Brooks Field Service personnel or customers trained on
the operation of the VDM can do basic diagnostic investigation and repair.
This is limited to the power entry module, external cables, fittings, and soft-
ware upgrades. ln all other situations the unit will have to be removed from
service and replaced.
There are two forms of troubleshooting the VDM300: general troubleshooting
and using the BEST as a diagnostic tool. General troubleshooting is essen-
tially making sure that the VDM300 is installed
properly and that all required operating conditions are met. Section 4-4
explains some general troubleshooting guidelines for the VDM300 in greater
detail. The VDM300 also has been designed to monitor its internal operat-
ing conditions and go into an alarm or fault condition if any of these condi-
tions are out of specification. When the red "DEVICE FAULT" LED is on, the
VDM300 has detected an internal problem. By using the BEST GUl, a field
service person or a trained user can access this information. See Section 3-4
for information about using the BEST GUI and Section 4-5 for details about
the troubleshooting information that can be accessed via BEST.
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