York YR Manual page 88

SECTION 3 - DISPLAY MESSAGES
MOTOR CONTROLLER – LOSS OF CURRENT
The compressor motor current decreased to 10% Full
Load Amps (FLA) for 25 continuous seconds while the
chiller was running. This could be caused by the start-
er de-energizing during run or a defect in the motor
current feedback circuitry to the Control Center. The
chiller will automatically restart at the completion of
SYSTEM LOCKOUT DELAY.
POWER FAULT
The CM-2 Current Module (Electro-Mechanical start-
er applications) has shutdown the chiller because it de-
tected a fault condition that places the motor at risk.
This device opens and closes the Motor Controller
"CM" contacts (connected between TB6-16 and TB6-
53 in the Control Center) in less than 3 seconds to initi-
ate the shutdown and produce this message. An LED
on the CM-2 Board illuminates to identify the fault.
The chiller will automatically restart when the contacts
close.
CONTROL PANEL – SCHEDULE
The programmed Daily Schedule setpoint has shut-
down the chiller. If this occurs while the chiller is run-
ning, the Pre-rotation Vanes are driven fully closed
prior to shutting down the chiller. The chiller will auto-
matically restart at the next scheduled start time.
MOD "B" SOLID STATE STARTER CYCLING
SHUTDOWN MESSAGES
LCSSS INITIALIZATION FAILED
When AC power is restored to the system after a power
failure, an initialization process occurs wherein the
Control Center attempts to establish communications
through the serial communications link with the Liquid
Cooled Solid State Starter. If communications are not
established within 10 consecutive attempts, a cycling
shutdown is performed and this message is displayed.
The Control Center attempts to establish communica-
tions until successful.
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
88
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 LCSSS,
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 ..." above. If the Control Center's
Microboard does not receive the cause of a starter ini-
tiated shutdown with 20 seconds of the shutdown, it
is assumed it is not forthcoming and that message is
replaced with this message. The chiller can be start-
ed 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 than10% 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 more than 25% of the FLA.
The chiller will automatically restart upon completion
of SYSTEM LOCKOUT DELAY.
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
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
JOHNSON CONTROLS