Johnson Controls YORK YK MaxE, Руководство по эксплуатации

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FORM 160.54-O1
151
JOHNSON CONTROLS
2
“ OIL – VARIABLE SPEED PUMP – DRIVE COn-
TACTS OPEn
”
The Oil Pump Variable Speed Drive has shut down the
chiller by opening its status contacts connected to the I/O
Board TB3-70. The Drive initiates a shutdown anytime
its internal protection circuits will not permit the Drive to
run. The contacts remain open until its internal protection
circuits are satisfied it is safe to operate. Some Drive ini -
tiated shutdowns require AC power to be cycled to clear
the fault. Refer to YORK Form 160.54-M1. The chiller
will automatically restart when the contacts close.
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
Control Center attempts to establish communications
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 communic-
ations until successful.
“LCSSS - SERIAL COMMUnICATIOnS”
After communications have been successfully estab-
lished in the INITIALIZATION process, the 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 shutdown 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 successfully
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 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 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 displayed for a few
seconds and then replaced with one of the following
fault messages.
“LCSSS - STOP COnTACTS OPEn”
Refer to “ LCSSS SHUTDOWn – REQUESTIng
FAULT DATA ... ” above. If the Control Center’s
Microboard does not receive the cause of a starter ini-
tiated shutdown with 20 seconds of the shutdown, it is
assumed it is not forthcoming and that message is re-
placed 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 less than 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 greater than 25% of the
Job FLA. The chiller will automatically restart upon
completion of SYSTEM COASTDOWN.
“LCSSS – LOW PHASE (X) TEMPERATURE
SEnSOR”
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 less
than 37°F. This would generally be indicative of a dis-
connected or defective sensor. If all three SCR Modules
are indicating a temperature of less than 37°F, the SCR
Module cooling pump turns on. This is accomplished
by disconnecting all three sensors. This feature allows
Service Technicians to run the cooling pump while fill -
ing 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 Control Center simultaneously; one via
the serial communications link and one via the start relay
TB6-24 in the Control Center. If they are not received
within 5 seconds of one another, a cycling shutdown is
performed and this message is displayed. This is gener-
ally indicative of defective wiring.