Protocol
Control
System
Users
Manual
2/12/01
alarm log) if the discharge pressure falls below
the alarm limits.
6.1.5.5 Sensor Failures
If a temperature or pressure probe failure
occurs, this alarm will be signaled. The alarm
will provide details as to what sensor has failed.
6.1.5.6 Compressor Proof Failures
This alarm will be signaled if a compressor
proof fails. Note that proofing is optional in
the Protocol refrigeration system. Refer to the
Protocol schematics for details.
6.1.5.7 Compressor General Alarms
This alarm will be signaled if a general alarm
occurs for a compressor. A general alarm
occurs when the digital input associated with
the compressor is active. There is one digital
input for each compressor. The digital input
will be activated when the oil level sensor trips,
there is a high pressure cutout or the discharge
temperature is to high. See the Protocol
schematic for details.
6.1.5.8 Phase Loss
This alarm will be signaled if the controller
detects a phase loss.
6.1.5.9 Controller Reset
If the controller resets due to an interruption of
power, this alarm will be signaled when power
is restored
6.1.6 Maintenance/Diagnostics
The controller provides the following
capabilities for maintenance:
6.1.6.1 Force Defrost
A circuit can be forced to perform a defrost or
to cancel a defrost in progress. Note that if a
defrost is forced, the defrost will terminate
normally as defined by the circuit setpoints.
6.1.6.2 Force Compressors
A compressor can be forced on or off. Note that
the user must be logged in to force the
compressor on or off and the compressor state
will return to normal when the controller logoff
timeout occurs.
6.1.6.3 Compressor Run Time
The run time (in hours) for each compressor is
stored. The run time can be cleared if a
compressor is replaced.
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