York YK-EP Operation And Maintenance Manual page 192

VSD – Frequency > 0 Hz
This start inhibit is set whenever the chiller is shutdown and a Compressor Motor Variable Speed
Drive (VSD) Output Frequency of greater than 0 Hz is detected. This fault is released and the chiller
can be started after the frequency is at 0 Hz and the WARNING RESET button is pressed. The oil
pump is started (with a starting frequency of 45 Hz) as soon as this fault is detected. A System
Coastdown is performed whenever this fault is released.
LCSSS – High Temperature Phase X - Stopped
(Mod. "B" Solid State Starter only)
The chiller is stopped and the Liquid Cooled Solid State Starter Logic/Trigger Board has detected
that the temperature of phase A, B, or C (designated as X in this message) Silicon Controlled
Rectifier (SCR) Module is greater than 110°F. The starter cooling pump will run and the chiller will
be inhibited from starting until the temperature decreases to less than 109°F.
Warning messages
Warning – Real Time Clock Failure
During the initialization process that occurs when power is applied to the Control Center, test
data is written to a location in the Real Time Clock. This data is then read from the Real Time Clock
and compared to the test data. If the read data is not the same as that which was written to the
device, it is assumed the Real Time Clock operation is defective and this message is displayed. The
microboard should be replaced by a qualified Service Technician.
Warning – Condenser or Evaporator XDCR Error
The Evaporator Pressure transducer is indicating a higher pressure than the Condenser pressure
transducer after the chiller has been running for 10 minutes. This is indicative of a Condenser or
Evaporator transducer failure. This message will be displayed until the condition clears and the
WARNING RESET Keypad key is pressed in Operator (or higher) access mode. Condition not checked
in Brine mode.
Warning – Standby Lube – Low Oil Pressure
A minimum of 15 PSID of oil pressure was not achieved in the first 30 seconds of a Standby
Lubrication cycle, or the pressure decreased below this value during the remainder of the cycle.
This message will be displayed and no further Standby Lubrications will be performed until the
WARNING RESET key is pressed in Operator (or higher) access mode.
This warning is also set when either the Pump Oil Pressure transducer or the Sump Oil Pressure
transducer is less than 2 PSIG when a Standby Lube is requested by automatic control. This inhibits
the Standby Lube cycle when the chiller is open to atmosphere.
Warning – Setpoint Override
A blank FeRam memory device or a failure of this device was detected during the initialization
process that occurs when power is applied to the Control Center. Due to this failure, any or all
of the programmed Setpoints could have been corrupted. Therefore, all Setpoints have been
automatically changed to their Default values. All Setpoints will have to be programmed to their
desired values. This message will clear when the WARNING RESET key is pressed in Operator (or
higher) access mode.
Warning – Condenser – High Pressure Limit
The Condenser Pressure exceeds the High Pressure Warning Setpoint threshold, programmed
by a Service Technician logged in at SERVICE access level. While this condition is in effect, the Pre-
Rotation Vanes are inhibited from further opening. This message automatically clears and the
Vanes are permitted to open when the condenser pressure decreases to 5 PSIG below the Setpoint.
192 YK-EP Style B Centrifugal Chiller