To aid in the meaning of the message, messages are displayed in different colors as follows:
• Normal Operation messages - Green
• Warning messages - Yellow
• Cycling Shutdown messages - Orange
• Safety Shutdown messages - Red
Warning messages will scroll between all those standing. Shutdowns will show first occurrence.
Table 85: Status messages
Message Description
CYCLING SHUTDOWN –
AUTO RESTART
The chiller is shut down on a CYCLING shutdown. The cause of the
shutdown is still in effect and is displayed on the Details line of the Status
Bar. The chiller will automatically restart when the CYCLING condition
clears.
MBC STARTUP
A chiller start has been initiated. The MBC conditions are verified and
transitioned to levitate the driveline rotor (MBC Levitation Mode). The
progress of the MBC startup is described in the Details Line of the Status
Bar.
SAFETY SHUTDOWN –
MANUAL RESTART
The chiller is shut down on a SAFETY shutdown. The cause of the
shutdown is still in effect and is displayed on the Details line of the Status
Bar. The chiller can be started after the Safety condition clears and the
Operator presses the CLEAR FAULT key.
SOFT SHUTDOWN
The chiller is performing a Soft Shutdown. Simultaneously, the Hot Gas
Bypass Valve is commanded to 100% open (if Hot Gas Bypass is Enabled),
the compressor VGD commanded to close rapidly. The motor drive speed
is slowed from its initial speed to the minimum required to prevent
surge. Then the motor drive speed is ramped to 0 Hz. The chiller then
transitions to coastdown. Soft Shutdown is initiated by the following:
• Leaving Chilled Liquid – Low Temperature
• Local Panel Stop Key
• Remote Stop
• Any MBC Fault occurs
• Multi-Unit Cycling – Contacts Open
• System Cycling – Contacts Open
• Control Panel – Schedule
• "Condenser – Flow Switch Open" fault active
• "Chilled Liquid – Flow Switch Open" fault active
• "Expansion I/O – Serial Communications" fault active
If the local panel safety stop switch is pressed or any chiller shutdown
faults other than those listed above occur, Soft Shutdown is immediately
terminated and a System Coastdown will occur.
START INHIBIT
The chiller is prevented from being started due to the reason displayed
on the Details Line of the Status bar.
107
YMC
2
Mod B with OptiView
™
Control Center
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