York YT Millennium, Эксплуатация и техническое обслуживание, Страница: 99 / 156

FORM 160.55-O1 (920)
99
YORK INTERNATIONAL
“ STARTER – HIGH SUPPLY LINE VOLTAGE ”
(Mod “A” Solid State Starter”)
The voltage in any phase of the AC Power Line Voltage
supplying the Solid State Starter has increased to the
high line voltage threshold for 20 continuous seconds.
The chiller will automatically restart when the voltage
returns to the restart level. The thresholds are as fol-
lows:
Supply Voltage Range (Volts) Shutdown (Volts) Restart (Volts)
380 415 414
400 436 435
415 454 453
440-480 524 523
550-600 655 654
Supply Voltage Range disabled none N/A
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
OptiView Control Center attempts to establish commu-
nications 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
communications until successful.
“LCSSS – SERIAL COMMUNICATIONS”
After communications have been successfully estab-
lished in the INITIALIZATION process, the OptiView
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 established, if the Control Center does not receive
a reply within 10 consecutive attempts, a Cycling shut-
down 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 suc-
cessfully completed. The Control Center attempts to
establish communications until successful.
“LCSSS SHUTDOWN – REQUESTING FAULT
DATA . . .”
The Liquid Cooled State Starter Logic/Trigger Board
has shut down the chiller but the OptiView 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 OptiView 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 mes-
sage is typically displayed for a few seconds and then
replaced with one of the below listed fault messages.
“LCSSS – STOP CONTACTS OPEN”
Refer to “ LCSSS SHUTDOWN – REQUESTING
FAULT DATA ... ” above. If the OptiView 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 forthcoming 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 <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 >25% of the FLA. The chiller will
automatically restart upon completion of SYSTEM
COASTDOWN.
“LCSSS – LOW PHASE X TEMPERATURE SEN-
SOR”
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) Silicon
Controlled Rectifier (SCR) Module has decreased to
<37°F. This would generally be indicative of a discon-
nected or defective sensor. If all three SCR Modules
are indicating a temperature of <37°F, the SCR Module
cooling pump turns on. This is accomplished by discon-
necting all three sensors. This feature allows Service
Technicians to run the cooling pump while filling the
cooling system by disconnecting plugs P2, P3 and P4
in the LCSSS.
“LCSSS – RUN SIGNAL”
The Liquid Cooled Solid State Starter receives two
start signals from the OptiView Control Center simul-
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