Speed Setpoints Screen; Figure 42 - Speed Setpoints Screen - York YST Operation Manual

FORM 160.67-O1
ISSUE DATE: 4/1/2015
noTe: OptiView
Control Center Screens shown may NOT represent the exact screens according to the software version utilized.
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figure 42 - Speed SeTpoinTS SCreen

overvieW
This screen allows programming of various speed
thresholds pertinent to the operation of the chiller and
the optional equipment supplied. It is also a gateway to
screens for programming pressures, time delays, and
ramp rates pertinent to the operation of the chiller. To
view the results of a setpoint change, the applicable
Screen name is also referenced. All setpoints except
those in Red text require a login access level of Ser-
vice or higher. The setpoints shown in Red text are pro-
grammed at the factory and can only be adjusted in the
field using the Administrator password. This password
changes daily and is based on the date. The password
is obtained by contacting the local service office.
prograMMable
SSp1 – Slow roll Speed
Access Level Required: SERVICE
Screen: Steam System
Range: 750-1200 RPM
This is the speed that the turbine will run at during the
slow roll warm up. If MSSP6-Turbine Lubrication is
set for Ring, this cannot be set below 1000 RPM in
order to ensure that the turbine bearings are sufficiently
JOHNSON CONTROLS

Speed SeTpoinTS SCreen

Default: 1000 RPM
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
lubricated during the slow roll. It is recommended that
all YST chillers be slow rolled at 1200 RPM to reduce
wear on the compressor bearings.
This setpoint is NOT programmable when
Turbine lubrication (MSS P6) is set for
"RING". In this case the RPM is fixed
at 1200 RPM.
SSp3 – fixed Speed
Access Level Required: SERVICE
Screen: Steam System
Range: 3200-4700 RPM
This is the constant speed that the turbine will run at
when MSSP7-Speed Control Mode on Capacity Con-
trol Setpoints Screen 1 is set to Fixed. When MSSP7-
Speed Control Mode is set to Variable, this is the speed
that the turbine will ramp up to during the TDSP17-
Turbine Stabilization Delay.
SSp4 – overspeed Test limit
Access Level Required: SERVICE
Screen: Auto/Manual
Range: 4500-5000 RPM
LD09282
Default: 3600 RPM
Default: 5000 RPM
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