York YK-EP B Operation & Maintenance Manual page 169

FORM 160.87-OM1
ISSUE DATE: 8/24/2018
lished, if the Control Center does not receive a reply
within 10 consecutive attempts, a cycling shutdown is
performed and this message is displayed. This same
cycling shutdown is performed, along with the same
message, if the Liquid Cooled Solid State Starter does
not receive a response from the Control Center after 10
consecutive attempts to communicate with the Control
Center after Initialization has been successfully com-
pleted. The Control Center attempts to establish com-
munications until successful.
LCSSS Shutdown – Requesting Fault Data...
The Liquid Cooled State Starter Logic/Trigger Board
has shut down the chiller but the Control Center has
not yet received the cause of the fault from the LC-
SSS, via the serial communications link. The LCSSS
shuts down the chiller by opening the Motor Controller
LCSSS Stop Contacts (K1 relay located on the starter
Logic/Trigger Board and connected between TB6-16
and TB6-53 in the Control Center). The Microboard,
in the Control Center then sends a request for the cause
of the fault to the Logic/Trigger Board over the serial
communications link. Since serial communications are
initiated every 2 seconds, this message is typically dis-
played for a few seconds and then replaced with one of
the following fault messages.
LCSSS – Stop Contacts Open
Refer to LCSSS Shutdown – Requesting Fault Data... on
Page 169. If the Control Center's Microboard does not
receive the cause of a starter initiated shutdown with 20
seconds of the shutdown, it is assumed it is not forth-
coming and that message is replaced with this message.
The chiller can be started when the Motor Controller
LCSSS Stop Contacts close.
A missing interlock jumper between Starter Logic/
Trigger Board J1-1 and J1-12 will also produce this
message.
LCSSS – Power Fault
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor current
in one or more phases has decreased to less than 10%
of the FLA for a minimum of 1 line cycle. This check
is inhibited during the first 4 seconds of System Run
and until the motor current is greater than 25% of the
Job FLA. The chiller will automatically restart upon
completion of System Coastdown.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
LCSSS – Low Phase (X) Temperature Sensor
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the temperature of the starter
phase A, B or C (designated as X in the message) Sili-
con Controlled Rectifier (SCR) Module has decreased
to less than 37°F. This would generally be indicative
of a disconnected or defective sensor. If all three SCR
Modules are indicating a temperature of less than 37°F,
the SCR Module cooling pump turns on. This is ac-
complished by disconnecting all three sensors. This
feature allows Service Technicians to run the cooling
pump while filling the cooling system by disconnect-
ing plugs P2, P3 and P4 in the LCSSS.
LCSSS – Run Signal
The Liquid Cooled Solid State Starter receives two
start signals from the Control Center simultaneously;
one via the serial communications link and one via the
start relay TB6-24 in the Control Center. If they are
not received within 5 seconds of one another, a cycling
shutdown is performed and this message is displayed.
This is generally indicative of defective wiring.
LCSSS – Invalid Current Scale
Selection
There is an invalid compressor motor current scale
jumper combination installed in the Liquid Cooled Solid
Starter Logic/Trigger Board J1. Jumper combination de-
termines allowable "100% FLA" setpoint range; 7L-35
to 260A, 14L-65 to 510A, 26L-125 to 850A and 33L-
215 to 1050A. The chiller will be permitted to start when
the jumpers are configured correctly. Refer to Solid State
Starter (Mod "B") – Operation and Maintenance (Form
160.00-O2) for valid jumper configurations.
LCSSS – Phase Locked Loop
The Liquid Cooled Solid State Starter Logic/Trigger
Board phase locked loop circuit was not able to main-
tain lock with phase A of the power line. This could be
caused by a power line anomaly such as sag or jitter. A
power line frequency jitter of up to 3 Hz/second can be
tolerated. The chiller will automatically restart when
lock has resumed.
LCSSS – Low Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor AC
Power Line Voltage, in any phase, decreased below the
low line voltage threshold continuously for 20 seconds.
The chiller will automatically restart when the voltage
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