Mod "B" Solid State Starter Safety Shutdown Messages - York YK-EP B Operation & Maintenance Manual

SECTION 3 - DISPLAY MESSAGES
Winding Setup Setpoint on that screen. The chiller can
be started after all winding temperatures decrease to at
least 18°F (10°C) below the shutdown threshold and
the Operator presses the WARNING RESET button.
This safety shutdown will not occur when the Wind-
ing Temperature Protection Setpoint is set to Disabled
on the MOTOR DETAILS Screen. Also, it will not act
on any RTD input registering as an open RTD or any
individual winding temperature sensor that has been
disabled with the Temperature Disable Setpoint on the
MOTOR SETPOINTS Screen.
Motor – High Bearing Temperature
This safety shutdown occurs when either of the enabled
motor bearing temperatures exceeds the programmed
High Bearing Temperature Shutdown threshold for 3
continuous seconds. The value programmed for this
safety threshold is displayed as High Bearing Temper-
ature Shutdown on the MOTOR SETPOINTS Screen.
It is programmed with the Bearing Setup Setpoint on
that screen. The chiller can be started after both bearing
temperatures decrease to at least 9°F below the shut-
down threshold and the Operator presses the WARN-
ING RESET button. This safety shutdown will not oc-
cur when the Bearing Temperature Protection Setpoint
is set to Disabled on the MOTOR DETAILS Screen.
Also, it will not act on any RTD input registering as an
open RTD.
Motor – High Bearing Vibration
Either the Shaft End or Opposite Shaft End motor
bearing vibration has exceeded the value programmed
for the High Vibration Shutdown Setpoint for the pro-
grammed number of delay seconds. This safety shut-
down does not occur when the Motor Vibration Pro-
tection Setpoint is set to Disabled on the MOTOR
DETAILS Screen or while the WARNING – MOTOR
– BEARING VIBRATION BASELINE NOT SET
warning is displayed. The chiller can be started after
both vibration values decrease below the shutdown
threshold and Operator presses the WARNING RESET
button.
Motor – Cooling Coil Leak
The Motor Cooling Coil Leak Detector has registered
a fault condition for at least 3 continuous seconds. The
Motor Cooling Coil leak Protection Setpoint enables
the type of sensor employed: If an optical sensor is be-
ing used, the input to the Motor Monitoring Board goes
high to indicate a leak; if a float switch is used, the
input goes low to indicate a leak. This safety shutdown
will not occur when the Motor Cooling Coil Leak Pro-
180
tection Setpoint is set to Disabled. The chiller can be
started after the leak sensor no longer indicates a leak
and the Operator presses the WARNING RESET but-
ton.
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 Operator presses the
WARNING RESET button.
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 Operator
presses the WARNING RESET button. However, the
chiller cannot be started until all SCR temperatures are
less than 109°F. During the shutdown, the starter cool-
ing 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 Operator presses the
WARNING RESET button.
FORM 160.87-OM1
ISSUE DATE: 8/24/2018
JOHNSON CONTROLS