Capstone Turbine Corporation
Model C65 Hybrid UPS User’s Manual
400027 Rev A (July 2010) Page
33 of 66
Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without
incurring any obligation either with respect to equipment previously sold or in the process of construction.
Fault Data Registers
The UPS Controller monitors the fault condition of each Hybrid UPS system it is connected to,
and periodically writes this fault status into multiple data registers that can be read externally
using Modbus TCP/IP. Some of this fault data is used within the UPS Controller to drive the
specific alarms noted above. Other fault data may be less critical to continued operation, but
should be recognized by facility personnel who can take appropriate action. For example, the
external building management system may be set up to poll selected fault registers and signal
users of certain conditions, such as:
• External Battery Power is Unavailable
– if the system is experiencing extremely low
battery state of charge or there is a fault on the battery bus, then the Hybrid UPS
system can no longer guarantee power output would be available in case the utility
becomes unavailable. This is not an Imminent Shutdown alarm in the sense that it
should drive automatic transfer of power to the utility source, since the Hybrid UPS
system is still able to deliver utility power to the load. However it should direct facility
personnel to correct the problem immediately, and could also be a reason to command
the Hybrid UPS systems into High Efficiency Mode so at least there would be turbine
power available in case of a utility outage.
• Fuel Source is Unavailable
– if a loss of fuel pressure fault is present, it means that
turbine power will not be available to supplement the external battery in the case of an
extended outage. This is neither an Imminent Alarm nor an Orderly Shutdown alarm,
but facility personnel should be alerted to correct the problem so the system will be
capable of supporting an extended utility outage.
A list of the available fault registers is provided in the UPS Controller Technical Reference
(410081).
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