Mod "B" Solid State Starter Cycling Shutdown Messages - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015
LCSSS – Serial Communications
After communications have been successfully estab-
lished in the Initialization process, the Control Center
initiates a data transmission to the Liquid Cooled Solid
State Starter on the serial communications link every 2
seconds. After these communications have been estab-
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 173. 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
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
and until the motor current is greater than 25% of the
Job FLA. The chiller will automatically restart upon
completion of System Coastdown.
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 3Hz/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
3
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