OM AGSD-1
57
High Lift Pressure - Unload
Event description (as shown on screen):
LiftPressHighUnloadN
Trigger:
While the compressor is running and unit mode is Cool, if saturated condenser
temperature >= High Saturated Condenser - Unload Value, the event is triggered.
Action Taken:
Unload the compressor by decreasing the slide target 5% every five seconds
until the condenser pressure drops below the High Saturated Condenser - Unload Value.
Reset:
While still running, the event will be reset if saturated condenser temperature <
(High Saturated Condenser - Unload Value – 10
o
F). The event is also reset if the unit mode
is switched to Ice, or the compressor state is no longer Run.
Failed Pumpdown
Event description (as shown on screen):
Pumpdown Fail Cir N
Trigger:
Circuit state = pumpdown for time > Pumpdown Time setpoint
Action Taken:
Shutdown circuit
Reset:
N/A
Power Loss While Running
Event description (as shown on screen):
Run Power Loss Cir N
Trigger:
Circuit controller is powered up after losing power while compressor was running
Action Taken:
Delay start of compressor by time equal to the Start-Start timer setpoint.
Reset:
N/A
VFD Fault
Event description (as shown on screen):
VFD Fault Cir N
Trigger:
VFD enabled and VFD fault input goes low
Action Taken:
None
Reset:
N/A
Alarm Logging
When an alarm occurs, the alarm type, date, and time are stored in the active alarm buffer
corresponding to that alarm (viewed on the Alarm Active screens) also in the alarm history
buffer (viewed on the Alarm Log screens). The active alarm buffers hold a record of all
current alarms. The active alarms can be cleared by pressing the Enter key when the end of
the list has been reached by scrolling.
A separate alarm log stores the last 25 alarms to occur. When an alarm occurs, it is put into
the first slot in the alarm log and all others are moved down one, dropping the last alarm. In
the alarm log, the date and time the alarm occurred are stored, as well as a list of other
parameters. These parameters include unit state, OAT, LWT, and EWT for all alarms. If
the alarm is a circuit alarm, then the circuit state, refrigerant pressures and temperatures,
EXV control state, EXV position, slide position, and number of fans on are also stored.
The alarm log shows a compressor run timer that tracks how long a compressor runs.
The alarm log has the compressor slide target as a logged parameter.
Event Logging
An event log similar to the alarm log holds the last 25 events to occur. When an event
occurs, it is put into the first slot in the event log and all other entries are moved down one,
dropping the last event. Each entry in the event log includes an event description as well as
the time and date of the occurrence. No additional parameters are logged for events.
The event log is only accessible with the Manager password.
Summary of Contents for AGS 225D
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