Oil – Variable Speed Pump – Drive Contacts 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 initiated shutdowns require AC Power to be
cycled to clear the fault. Refer to OptiView Control Center – Service Instructions (Form 160.76-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 communications until successful.
LCSSS – Serial Communications
After communications have been successfully established 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
See LCSSS Shutdown – Requesting Fault Data. If the Control Center’s Microboard does not receive
the cause of a starter initiated shutdown with 20 seconds of the shutdown, it is assumed it is not
forthcoming and that message is replaced 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.
175Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
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