Table 85: Status messages
Message Description
SYSTEM COASTDOWN
The chiller has shut down and removed the run signal from the motor
variable speed drive (VSD). The system is waiting for confirmation that
the driveline has stopped rotating. When the MBC and VSD report drive
frequency of 0Hz for 5 seconds, coastdown is considered completed.
Then, after 60 seconds delay the VSD Precharge command is released.
SYSTEM READY TO
START
The chiller is shut down but will initiate start upon receipt of a Local or
Remote start signal. The Magnetic Bearing Controller (MBC) does not
have the driveline rotor levitated. The Hot Gas Bypass Valve position (if
present) is set to the programmed Hot Gas Startup Position. The Level
Control Valve position is set to the programmed Condenser Level Control
Valve Startup Position. The VGD driven to the programmed VGD Startup
Position.
SYSTEM RUN
The chiller is running under the condition described in the Details Line of
the Status Bar.
SYSTEM STOPPED The chiller is shutdown with a prevailing stop command.
Table 86: Run messages
Message Description
LEAVING CHILLED
LIQUID CONTROL
The chiller is running, controlling the Leaving Chilled Liquid to the
Leaving Chilled Liquid Temperature Setpoint. Or if the unit is a
Heatpump and the Control Mode is Cooling.
LEAVING CONDENSER
LIQUID CONTROL
The chiller is running, controlling the Leaving Condenser Liquid to
the Leaving Condenser Liquid Temperature Setpoint. If the unit is a
Heatpump and the Control Mode is Heating.
LEAVING CHILLED &
CONDENSER LIQUID
CONTROL
The chiller is running, controlling the either Leaving Chilled Liquid or
Leaving Condenser Liquid Temperature. If the unit is a Heatpump and
the Control Mode is Cooling & Heating.
WARNING – VSD DC
BUS ACTIVE
This non-annunciating message alerts that the DC Bus is precharged
or pre-regulated for a state outside of chiller run. It is set when the VSD
indicates a precharge or pre-regulated state or DC Bus voltage >50v
in the stopped state. A countdown timer shows with this message to
indicate the time remaining in a precharge or pre-regulate command
while stopped.
VSD – HIGH INPUT
CURRENT LIMIT
The Chiller Input current is greater than or equal to the Active Current
Limit Setpoint. The Current Limit Setpoint is programmed over a range
of 30 to 100% of the Chiller Full Load Amps (FLA). The Active limit is
the minimum of the Local, pulldown (if active), and Remote Current
Limit Setpoints in Remote mode or the remote value in BAS (ISN)
mode. While this condition is in effect, chiller capacity control is in
override to reduce current. Normal LCHLT capacity control operation is
resumed and this message automatically clears when the input current
decreases below this limit.
The highest of the three phase input currents divided by the
programmed Job Input FLA is compared to the limit for this override.
YMC
2
Mod B with OptiView
™
Control Center
108
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