Soft Shutdown Message - York YST Operation Manual

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
"Turbine idling – insufficient vacuum"
The turbine is rotating at the SSP1-Slow Roll Speed
shown on the Speed Setpoints Screen, the slow roll
timer has decremented to 0, but the turbine exhaust
pressure is not below the PSP6-Ready To Run pressure
entered on the Pressure Setpoints Screen. During slow
roll, the vacuum pump is started automatically if the
exhaust pressure increases above this setpoint.
"ready To run"
The turbine is rotating at the SSP1-Slow Roll Speed
shown on the Speed Setpoints Screen, the slow roll
timer has decremented to 0, and the turbine exhaust
pressure has been reduced to the PSP6-Ready To Run
pressure shown on the Pressure Setpoints Screen. This
message will remain until the "Run At Rated" key that
appears on the Steam System Screen is pressed to close
the Chilled Liquid Pump Start contacts and initiate
the ramp up to rated speed. When MSSP4-Turbine
Start Mode is set for Auto on Configuration Screen
1, the Chilled Liquid Pump Start contacts are closed
automatically when this message appears.
"ramping To rated Speed"
The Chilled Liquid Flow Switch contacts have closed,
the ramp up to the SSP2-Minimum Rated Speed shown
on the Speed Setpoints Screen has been initiated and
the turbine speed has increased above the SSP5-
Chilled Liquid Pump Turn-On Speed shown on the
Speed Setpoints Screen indicating that ramp up to rated
speed has commenced.
"Turbine Stabilizing"
The turbine has achieved minimum rated speed and is
increasing to the SSP3-Fixed Rated Speed shown on
the Speed Setpoints Screen. The compressor vanes are
opening to the PRVM-PRV Minimum Open Position
shown on the Capacity Control Setpoints Screen 2.
This message will remain until the capacity controls are
enabled after the TDSP17-Turbine Stabilization Delay
shown on the Time Setpoints Screen has elapsed. A
countdown timer displaying the time remaining in the
stabilization cycle also appears with this message.
"System run"
The chiller is running under the condition described in
the Details Line of the Status Bar.
132
run MeSSageS
"leaving Chilled liquid Control"
The chiller is running, controlling the Leaving Chilled
Liquid to the Leaving Chilled Liquid Temperature
Setpoint. There are no system conditions inhibiting this
operation.
Motor drive running
The YK Optiview Electric Driveline panel can initi-
ate liquid level control will be accomplished using the
YST Optiview panel. The YST panel will control the
liquid level valve with an analog output signal, based
on the liquid level setpoint programmed in the YST
Optiview Panel, as compared to the actual liquid level
being sensed by the YST Optiview panel.
The run contact on the electric driveline panel will be
connected to the I/O board terminals 1 and 9 on the
YST panel. When the I/O board input to terminal 9 is
on (120 vac), the level control in the YST will be en-
abled.
When the YST driveline is shut down and the Elec-
tric driveline panel run contact closes, the level control
is enabled the same as it would be if the YST panel
achieved the system run mode after a normal startup
sequence. The two signals cannot be switched between
the panels when the drive selection is made. The level
control will be disabled on the electric driveline panel.
All time delays and ramping functions associated with
the YST subcooler level control will operate the same
as if the YST turbine had been started and achieved the
system run mode after a normal startup sequence.
The SYSTEM STATUS bar will display the text MO-
TOR DRIVE RUNNING and the SYSTEM DETAILS
bar should display the text SUBCOOLER LIQUID
LEVEL CONTROL ENABLED.

SofT ShuTdoWn MeSSage

Soft Shutdowns are initiated by the following:
1. "Leaving Chilled Liquid – Low temperature"
2. "Remote Stop"
3. "System Cycling – Contacts Open"
4. Operator Initiated at Keypad
While the chiller is unloading during any Soft Shut-
down, if a Local Stop is initiated with the START/
STOP control switch or any faults other than those list-
FORM 160.67-O1
ISSUE DATE: 4/1/2015
JOHNSON CONTROLS