Display Messages; Status Messages - York YST Operation Manual

FORM 160.67-O1
ISSUE DATE: 4/1/2015
The Status Bar of the Display contains a Status Line
and, beneath it a Details Line. The Status Line contains
a message describing the operating state of the chill-
er; whether it is stopped, running, starting or shutting
down. The Details Line displays Warning, Cycling,
Safety, Start Inhibit and other messages that provide
further details of the Status Bar messages. The Status
Messages listed below are displayed on the Status Line.
All other messages are displayed on the Details Line.
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

STaTuS MeSSageS

"Start inhibit"
The chiller is prevented from being started due to the
reason displayed on the Details Line of the Status bar.
"Cycling Shutdown – auto restart"
The chiller is shut down on a CYCLING shutdown.
The cause of the shutdown is still in effect and is dis-
played on the Details line of the Status Bar. The chiller
will automatically restart when the CYCLING condi-
tion clears.
"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 moves the START/STOP control switch to
the STOP-RESET (O) position.
"System ready To Start"
The chiller is shut down but will start upon receipt of a
Local or Remote start signal.
"Start Sequence initiated"
A chiller start has been initiated and the pre-start lu-
brication is being performed. The Prelube duration is
either 50 seconds or 180 seconds, as configured on the
SETUP SCREEN. The Pre-lube duration must never
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

diSplaY MeSSageS

be changed by anyone other than a qualified Service
Technician. The standard Prelube duration is 50 sec-
onds. A countdown timer displaying the time remain-
ing in the prelube cycle also appears with this message.
"System Starting"
The main start relay K18 on the York I/O board is on
to energize the Turbine Trip Valve Air Dump Solenoid
and open the trip valve. The Turbine Trip Valve Limit
Switch input is not energized indicating that the trip
valve has not yet opened. When MSSP4-Turbine Start
Mode is set for Auto on Configuration Screen 1, this
message will remain until the turbine is rotating at 500
RPM indicating that slow rolling has commenced.
"ready To begin Slow roll"
The Turbine Trip Valve Limit Switch input is ener-
gized indicating that the trip valve has opened but the
BEGIN SLOW ROLL Key has not been pressed. This
message will remain until the "Begin Slow Roll" key
that appears on the Steam System Screen is pressed to
initiate the slow roll warm-up of the turbine.
"Waiting for Steam flow"
When MSSP4-Turbine Start Mode is set for Manual,
this message will appear after the "Begin Slow Roll"
key that appears on the Steam System Screen has been
pressed to initiate the slow roll warm-up of the tur-
bine. This message will remain until the operator has
opened the slow roll bypass valve to admit sufficient
steam flow to begin slow rolling the turbine. It will be
displayed until the turbine speed has increased to 500
RPM.
"Slow rolling"
The ramp up to the SSP1-Slow Roll Speed shown on
the Speed Setpoints Screen has been initiated and the
turbine speed has increased to 500 RPM indicating that
slow rolling has commenced. A countdown timer dis-
playing the time remaining in the slow roll cycle also
appears with this message. This time will usually begin
decrementing anywhere from 15-30 minutes depend-
ing on the inlet steam temperature and the MSSP17-
Turbine Stage Count shown on the Configuration
Screen 1. However, if a chiller start is initiated within
15 minutes of the last "Run At Rated" command, the
calculated slow roll time is reduced to 5 minutes be-
cause the turbine rotor is still hot and the shaft has not
been stationary long enough to bow. In this case the
display would start decrementing at 4 minutes.
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