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

FORM 160.76-O2
issue date: 6/15/2015
MOD "B" SOLID STATE STARTER
SAFETY SHUTDOWN MESSAGES
LCSSS Shutdown – Requesting Fault Data...
The Liquid Cooled Solid State Starter Logic/Trigger
Board has shut down the chiller but the Control Cen-
ter has not yet received the cause of the fault from the
LCSSS, via the serial communications link. The LC-
SSS shuts down the chiller by opening the Motor Con-
troller 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 Clear Fault key is
pressed on the display.
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 Clear
Fault key is pressed on the display.. However, the chill-
er cannot be started until all SCR temperatures are less
than 109°F. During the shutdown, the starter cooling
pump runs until the temperature is less than 109°F.
LCSSS – 105% Motor Current Overload
The highest phase of the compressor motor current in-
creased to greater than 105% of the programmed 100%
chiller Full Load Amps continuously for 40 seconds.
The chiller can be started after the Clear Fault key is
pressed on the display.
JOHNSON CONTROLS
SECTION 3 - DISPLAY MESSAGES
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
detected by the Liquid Cooled Solid State Starter
Logic/Trigger Board. The voltage across each SCR in
monitored to detect the shorted condition. The shorted
condition must exist continuously for 5 seconds in or-
der 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 Clear Fault
key is pressed on the display.
LCSSS – Open SCR
An open Silicon Controlled Rectifier (SCR) has been
detected by the Liquid Cooled Solid State Starter
Logic/Trigger Board. The open condition must exist
continuously 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
OptiView Control Center – Service Instructions (Form
160.76-M1).
LCSSS – Phase (x) Open SCR
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 is equipped with
Eprom version C.SSS.01.03 (and later) 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 Clear Fault key is pressed on the display.
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