York YST Operation Manual page 107

FORM 160.67-O1
ISSUE DATE: 4/1/2015
TdSp5 – Chilled liquid flow Switch Check
delay
Screen: Evaporator
Range: 0-60 Sec
Whenever the Chilled Liquid Pump Start Contact is
closed, the flow switch must be closed within this time
in order to avoid a shutdown. In some plants where
there is not a dedicated chilled liquid pump for each
chiller and this contact is used to initiate the opening
of a valve in the chilled liquid inlet line, this delay may
need to be increased if the valve actuator is slow. This
will provide the additional time required for the valve
to open sufficiently to establish the minimum flow re-
quired.
TdSp6 – Subcooler level valve pulldown
delay
Screen: Condenser
Range: 0-1800 Sec
This is the time that the Subcooler Refrigerant Level
Controller is inactive after startup with the level con-
trol valve output signal held at 100% to keep the valve
fully open. This delay starts after the ramp up to rated
speed has been completed and the TDSP17-Turbine
Stabilization Delay has elapsed.
TdSp9 – Soft Shutdown rampdown Timeout
Screen: Home
Range: 2-20 Min
When a soft shutdown is initiated, the chiller will be
shutdown after this delay regardless of the regardless
of the speed or position of the vanes and hot gas valve.
TdSp11 – hotwell pump Shutdown delay
Screen: Condensate
Range: 0-3600 Min
This determines how long the Hotwell Pump remains
on after the drive train has coasted to a complete stop.
During this delay, the Condenser Liquid Pump Start
Contact remains closed, the oil cooler liquid solenoids
remain energized, and the Turbine Steam Ring Drain
Solenoid remains de-energized.
TdSp12– Turbine auxiliary oil pump postlube
Screen: Turbine
Range: 30-40 Min
JOHNSON CONTROLS
Default: 10 Sec
Default: 600 Sec
Default: 10 Min
Default: 360 Sec
Default: 30 Min
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
This is only used when the turbine is supplied with an
auxiliary oil pump and MSSP6-Turbine Lubrication
Type is set for Pump on the Configuration Screen 1. It
determines how long the pump remains on to provide
cooling oil to the turbine bearings after the drive train
has coasted to a complete stop.
TdSp17– Turbine Stabilization delay
Screen: Home
Range: 0-300 Sec
This determines how long the turbine runs after achiev-
ing SSP2-Minimum Rated Speed before the capacity
controls are enabled. During this time, the speed in-
creases to the SSP3-Fixed Rated Speed, the compres-
sor vanes are opening to the PRVM-PRV Minimum
Open Position, and a countdown timer displaying the
time remaining in the stabilization cycle appears with
the message TURBINE STABILIZING.
When MSSP7-Speed Control Mode is set for Vari-
able, the capacity controls will attempt to reduce the
speed to the SSP2-Minimum Rated Speed unless the
head pressure increases as the hot gas valve closes and
causes the calculated anti-surge minimum speed to
increase above the minimum rated speed. This delay
gives the speed control time to stabilize at the higher
SSP3-Fixed Speed that is usually set well above the
critical speed of the turbine.
When MSSP7-Speed Control Mode is set for Fixed,
this delay should be set to 0 since the capacity con-
trols will not attempt to reduce the speed towards the
turbine critical speed. This allows the Hot Gas Bypass
Valve to begin ramping closed and the vanes to begin
ramping open as soon as SSP2-Minimum Rated Speed
is achieved.
Change Setpoints
Access Level Required: SERVICE
This key enables the field selection cursor. The operator
may then toggle between the programmable data fields
using the Cursor Arrow keys.
navigaTion
home
Access Level Required: VIEW
Causes an instant return to the Home Screen.
Default: 5 Sec
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