York YR Manual page 94

SECTION 3 - DISPLAY MESSAGES
MOD "B" SOLID STATE STARTER
SAFETY SHUTDOWN MESSAGES
LCSSS SHUTDOWN - REQUESTING FAULT
DATA...
The Liquid Cooled Solid State Starter Logic/Trig-
ger 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 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 - HIGH INSTANTANEOUS CURRENT
The Liquid Cooled Solid State Starter Logic/Trigger
Board detected that the compressor motor current in
any phase exceeded 1.1(1.414 x RMS 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 PHASE (X) HEATSINK
TEMPERATURE - RUNNING
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the temperature of phase A, B or
C (designed as X in the message) Silicon Controlled
Rectifier (SCR) Modules has exceeded 212°F while
the chiller was running. The safety can be reset after all
SCR temperatures are less than 210°F and the COM-
PRESSOR switch is placed in the Stop-Reset posi-
tion (O). However, the chiller cannot be started until
all SCR temperatures are less than 109°F. During the
shutdown, the starter cooling pump runs until the tem-
perature is less than 109°F.
LCSSS - 105% MOTOR CURRENT OVERLOAD
The highest phase of the compressor motor current in-
creased to more than 105% of the programmed 100%
chiller Full Load Amps continuously for 40 seconds.
The chiller can be started after the COMPRESSOR
switch is placed in the Stop-Reset (O) position.
94
LCSSS - PHASE (X) SHORTED SCR
A shorted Silicon Controlled Rectifier (SCR) in phase
A, B or C (designated as X in the message) has been de-
tected by the Liquid Cooled Solid State Starter Logic/
Trigger Board. The voltage across each SCR in moni-
tored to detect the shorted condition. The shorted con-
dition 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 Rectifier (SCR) has been
detected by the Liquid Cooled Solid State Starter Log-
ic/Trigger Board. The open condition must exist con-
tinuously for 5 seconds in order to annunciate the fault.
The chiller can be started after the condition has been
corrected 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 quali-
fied Service Technician to disable this check. Refer to
YORK Service Manual 160.81-M1.
LCSSS – PHASE (X) OPEN SCR
(Software versions C.MLM.05.05.xxx and later or
C.OPT.05.05.302 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 occurred is identified.
LCSSS - PHASE ROTATION
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected the three phase compressor motor
power line voltage phase rotation is not correct. The
chiller can be started after the phase rotation is correct
and the COMPRESSOR switch is placed in the Stop-
Reset (O) position.
FORM 160.81-O1 (1020)
ISSUE DATE 10/05/2020
JOHNSON CONTROLS