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YORK INTERNATIONAL
108
FORM 160.55-O1 (604)
MOD “B” SOLID STATE STARTER
SAFE TY SHUTDOWN MES SAG ES
“LCSSS SHUTDOWN – REQUESTING FAULT
DATA...”
The Liquid Cooled Solid 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 Log ic/Trigger Board
and connected between TB6-16 and TB6-53 in the Con-
trol 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 com mu ni ca tions
link. Since serial communications are ini ti at ed every 2
sec onds, this message is typically dis played for a few
sec onds and then replaced with the one of the below
listed fault messages.
“LCSSS – HIGH INSTANTANEOUS CUR RENT”
The Liquid Cooled Solid State Starter Logic/Trigger
Board detected that the compressor motor current in
any phase exceeded 1.1(1.414xRMS value of the pro-
grammed Start Current) for a minimum of 1 second. The
chiller can be started after the COMPRESSOR switch
is placed in the Stop-Reset (O) position.
“LCSSS – HIGH TEMPERATURE PHASE X
– RUN NING”
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the temperature of phase A, B or
C (de signed as X in the message) Silicon Controlled
Rec ti Þ er (SCR) Modules has exceeded 212°F while
the chill er was running. The safety can be reset after all
SCR tem per a tures are < 210°F and the COM PRES SOR
switch is placed in the Stop-Reset position (O). However,
the chiller cannot be start ed until all SCR tem per a tures
are < 109°F. During the shutdown, the start er cooling
pump runs until the tem per a ture is < 109°F.
“LCSSS – 105% MOTOR CURRENT OVER-
LOAD”
The highest phase of the compressor motor current in-
creased to > 105% of the programmed 100% chiller Full
Load Amps continuously for 40 seconds. The chill er can
be started after the COMPRESSOR switch is placed in
the Stop-Reset (O) position.
“LCSSS – PHASE X SHORTED SCR”
A shorted Silicon Controlled RectiÞ er (SCR) in phase
A, B or C (designated as X in the message) has been
detected by the Liquid Cooled Solid State Starter
Log ic/Trigger Board. The voltage across each SCR in
mon i tored to detect the shorted condition. The shorted
con di tion must exist continuously for 5 seconds in order
to annunciate the fault. This check is disabled while the
chiller is running. The chiller can be started after the
condition has been corrected and the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
“LCSSS – OPEN SCR”
An open Silicon Controlled RectiÞ er (SCR) has been
de tect ed by the Liquid Cooled Solid State Starter
Log ic/Trigger Board. The open condition must exist
con tin u ous ly for 5 seconds in order to annunciate the
fault. The chiller can be started after the condition has
been cor rect ed and the COMPRESSOR switch is placed
in the Stop-Reset (O) position. This check is disabled
when the chiller is shut down. In certain applications,
local power line conditions could interfere with the open
SCR detection technique. This requires a qualiÞ ed Ser-
vice Technician to disable this check. Refer to YORK
Ser vice Manual 160.55-M1.
“LCSSS – PHASE (X) OPEN SCR”
(Software versions C.MLM.02.06.xxx and later or
C.OPT.02.06.303 and later)
An open SCR in phase A, B or C (designated as X in
message) has been detected. This safety shutdown has
the same criteria as “LCSSS – OPEN SCR” above.
However, when the Solid State Starter Logic/Trigger
Board is equipped with Eprom version C.SSS.01.03 (and
later) and the Optiview Control Center is equipped with
above software, the phase in which the open SCR oc-
curred is identiÞ ed
“LCSSS – PHASE ROTATION”
(Flash memory Card version C.MLM.02.01 or later)
The Liquid Cooled Solid State Starter Logic/Trig ger Board
has detected the three phase com pres sor motor power line
voltage phase ro ta tion is not correct. The chiller can be start ed
after the phase rotation is correct and the COM PRES SOR
Switch is placed in the Stop-Reset (O) po si tion.
COMPRESSOR MOTOR VARI ABLE
SPEED DRIVE:
SAFETY SHUTDOWN MES SAG ES
The following Safety shutdown messages are dis played
on Compressor Motor vari able Speed Drive (VSD) ap-
pli ca tions only. These messages are gen er at ed by events
that occur within the VSD. The chiller can be started
after manual resets are per formed as de tailed below.
Service and trou ble shoot ing information is contained
in YORK Manual 160.00-M1.
OptiView Control Center