Johnson Controls YORK YK MaxE, Operation Manual

Page: 163 / 184

FORM 160.54-O1
163
JOHNSON CONTROLS
2
“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 TEM-
PERATURE – 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 COMPRESSOR
switch is placed in the Stop-Reset position (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 temperature is less than 109°F.
“LCSSS – 105% MOTOR CURRENT OVER -
LOAD”
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 COMPRESSOR switch
is placed in the Stop-Reset (O) position.
“LCSSS – PHASE (X) SHORTED SCR”
(Flash memory Card version C.MLM.01.04 or later)
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 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
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 qualified Ser -
vice Technician to disable this check. Refer to YORK
Service Manual 160.54-M1.
“LCSSS – PHASE (X) OPEn SCR
”
(Software versions C.MLM.01.11.xxx and later or
C.OPT.01.11.303 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 ver-
sion 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”
(Flash memory Card version C.MLM.01.04 or later)
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.
CoMpressor Motor VariaBLe
speed driVe:
safetY shUtdoWN Messages
The following Safety shutdown messages are displayed
on Compressor Motor variable Speed Drive (VSD) ap-
plications only. These messages are generated by events
that occur within the VSD. The chiller can be started
after manual resets are performed as detailed below.
Service and troubleshooting information is contained
in YORK Manual 160.00-M1.
“ VSD SHUTDOWn – REQUESTIng FAULT
DATA
”
The VSD has shut down the chiller and the control
center has not yet received the cause of the fault from
the VSD, via the serial communications link. The VSD
shuts down the chiller by opening the Motor Control-
ler “VSD Stop Contacts” (located on the VSD Logic
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 VSD Logic Board via the Adaptive Capacity Control
Board, over the serial link. Since serial communications
are initiated every 2 seconds, this message is typically
displayed for a few seconds and then replaced with one
of the following fault messages.