York YK Style H Operation Manual page 172

SECTION 3 - DISPLAY MESSAGES
Condenser – Flow Switch Open
The condenser water flow switch has remained open
for 30 continuous seconds while the chiller was run-
ning. This check is bypassed for the first 30 seconds
of System Run. The chiller will automatically restart
when the flow switch closes.
While this cycling shutdown is active, the condenser
pump contacts (TB2-150/151) remain closed until the
chiller is given a stop command or has another fault.
With all previous software versions, these contacts
open at completion of coastdown.
Motor Controller – Contacts Open
The CM-2 Current Module (Electromechanical starter
applications) has shutdown the chiller. When detecting
a fault condition that places the starter or motor at risk,
these devices open the Motor Controller contacts "CM"
(located on the respective device and con-nected between
TB6-16 and TB6-53 in the Control Cen-ter) to initiate
a shutdown. Since there are several different faults that
are monitored, LED's on the respective device illuminate
to identify the specific fault that has occurred. Refer to
OptiView Control Center – Service Instructions (Form
160.76-M1) for CM-2 initiated shutdowns. The chiller
will automatically restart when the Motor Controller con-
tacts close. On some shutdowns, the respective device au-
tomatically closes the contacts when the fault condition
clears. Other shutdowns require the Operator to perform a
Manual Reset at the respective device.
MANUAL
DEVICE
RESET FAULT
Overload
CM-2
Module
Overload
Motor Controller – Loss Of Current
The Compressor Motor current decreased to 10% Full
Load Amps (FLA) for 25 continuous seconds while the
chiller was running. This could be caused by the start-
er de-energizing during run or a defect in the motor
current feedback circuitry to the Control Center. The
chiller will automatically restart at the completion of
System Coastdown.
Power Fault
The CM-2 Current Module (Electro-Mechanical Start-
er applications) has shut down the chiller because it
detected a fault condition that places the motor at risk.
These devices open and close the Motor Controller
"CM" contacts located in the CM-2 and connected
172
AUTOMATIC
RESET FAULT
None
Phase Rotation/Loss
between TB6-16 and TB6-53 in the Control Center in
less than 3 seconds to initiate the shutdown and pro-
duce this message. An LED on the CM-2 illuminates
to identify the specific fault that has occurred. Refer to
OptiView Control Center – Service Instructions (Form
160.76-M1) for CM-2 initiated shutdowns. The chiller
will automatically restart when the contacts close.
DEVICE
CM-2 Module
Proximity Probe – Low Supply Voltage
(Chillers with J or H3 compressors).
This message indicates the +24VDC power sup-
ply voltage to the Proximity Probe has decreased to
+19.0VDC. This is below the minimum level required
for reliable operation. The chiller will automatically re-
start when the voltage increases to greater than or equal
to 19.7VDC.
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 Op-
tiView 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 pow-
er 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 communica-
tions until successful.
FORM 160.76-O2
issue date: 6/15/2015
SHUTDOWN
Power Fault
JOHNsON CONtROLs