Table 6: Warning messages
Message Description
Warning – Head Pressure
– High Head Lag Start
Limit
Displayed when starting the lag compressor while a high head condition exists. A high head
condition exists when the actual Delta P/P is greater than the High Head DP/P Limit
setpoint. To minimize surging while starting the lag compressor under this condition, the
lead compressor’s pre-rotation vanes are driven closed coincident with the start of the lag
compressor’s pre-lube. They will be allowed to open after the lag compressor is running, the
lag discharge valve is open and the lead and lag motor currents are balanced within 5%.
Warning – Anti Surge –
Excess Surge Limit
This warning applies to dual compressor operation only. The pre-rotation vanes are being
load limited because a surge event has been detected while both compressors are running.
As a surge avoidance, a close signal is applied to both the lead and lag compressor vanes
until the lowest motor current is greater than or equal to 80% of the highest motor current.
The load limit will remain in effect until the lag compressor is shutdown, whereupon the
message is cleared.
Warning – Anti Surge –
Surge Count Exceeded
This warning applies to dual compressor operation only. The Surge Window Count
exceeded the Count Limit while both compressors were running. To prevent further
surging, a soft shutdown is performed on the lag compressor when this warning is
displayed. This message will be displayed until manually cleared with the Warning Reset key
in operator (or higher) access level.
Warning – Compressor #1
Locked Out
Compressor 1 is inhibited from starting because it has been placed in service lockout. This is
performed on the Compressor capacity cycling screen.
Warning – Compressor #2
Locked Out
Compressor 2 is inhibited from starting because it has been placed in service lockout. This is
performed on the Compressor capacity cycling screen.
Warning – Oil Pump #1 –
Seal Lubrication - Low
Pressure
A minimum of 15 psid of oil pressure was not achieved in the first 30 seconds of the seal
lubrication cycle (or it dropped below this value during the remaining 90 seconds of the
cycle) for compressor 1. This message must be manually cleared using the Warning Reset
key in Service access level (or higher). As soon as the message is cleared, another seal
lubrication will be attempted. The message will also be cleared if Standby Lube 1 is disabled
on Oil pump 1 screen or compressor 1 enters the prelube state.
Warning – Oil Pump #2 –
Seal Lubrication - Low
Pressure
A minimum of 15 psid of oil pressure was not achieved in the first 30 seconds of the seal
lubrication cycle (or it dropped below this value during the remaining 90 seconds of the
cycle) for compressor 2. This message must be manually cleared using the Warning Reset
key in service access level (or higher). As soon as the message is cleared, another seal
lubrication will be attempted. The message will also be cleared if standby lube 2 is disabled
on Oil pump 2 screen or compressor 1 enters the prelube state.
Warning – Low Oil Level Displayed if the oil level in the oil sump is less than the minimum oil level as shown below.
Condition Minimum oil level
No compressors running 50%
1 compressor running 40%
2 compressors running 30%
It will automatically clear when the level is greater than the minimum oil level.
Warning – Oil Pump #1
– Seal Lubrication In
Progress
The 2 minute seal lubrication cycle (that occurs once every 24 hours while the compressor 1
is not running) is in progress for compressor 1.
Warning – Oil Pump #2
– Seal Lubrication In
Progress
The 2 minute seal lubrication cycle (that occurs once every 24 hours while compressor 2 is
not running) is in progress for compressor 2.
Warning – Vanes #1 –
Uncalibrated
The pre-rotation vanes calibration procedure has not been performed on compressor 1.
Warning – Vanes #2 –
Uncalibrated
The pre-rotation vanes calibration procedure has not been performed on compressor 2
Warning – Surge
Protection - Excess
Surge Detected
This warning applies only to single compressor operation and only if the Surge
Protection Shutdown setpoint is disabled. The Surge Window Count has exceeded the
Count Limit setpoint during single compressor operation. This message can be cleared
with the Warning Reset key in operator access level (or higher) after the Surge Window
Count is less than the Count Limit.
37Model YD Mod D with OptiView Control Center
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