JOHNSON CONTROLS
146
FORM 160.67-O1
ISSUE DATE: 4/1/2015
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
This shutdown must be evaluated by a
qualified Service Technician prior to
starting the Chiller. Starting the Chiller
without this evaluation could result in se-
vere Compressor damage. To prevent the
Chiller from starting without the proper
evaluation, restart is inhibited until the
Switch Contacts have closed and a spe-
cial reset procedure is performed by the
Technician.
“Mechanical Overspeed Test Failure”
The turbine mechanical overspeed trip mechanism
failed to trip the turbine and the speed exceeded the
SSP4-Overspeed Test Limit shown on the Speed
Setpoints Screen for 2 seconds. The START/STOP
control switch must be placed in the STOP-RESET (O)
position before starting the chiller.
“ Compr Thrust Bearing Proximity Probe
Uncalibrated”
This message will only appear during initial testing and
set up of a new panel or if the Microboard or BRAM
(U38) memory device on the Microboard has been
replaced. The proximity probe calibration procedure
must be performed before the chiller may be operated.
TURBINE VIBRATION SHUTDOWN
MESSAGES
When MSSP4-Turbine Start Mode is set for Auto on
Configuration Screen 1 the turbine must be fitted with
two proximity probes on each end of the turbine to
protect the turbine from excessive shaft vibration. The
“Horizontal” designation refers to the proximity probe
installed at approximately 45 degrees from the vertical
center on the right side when facing the governor end
of the turbine. The “Vertical” designation refers to the
proximity probe installed at approximately 45 degrees
from the vertical center on the left side when facing the
governor end of the turbine. When the MSSP4-Turbine
Start Mode is set for Manual, MSSP13-Turbine Shaft
Vibration Sensors must be set for Enabled on Configu-
ration Screen 1. When the sensors are enabled, the fol-
lowing messages are also enabled:
After the probe cables are connected to
the transmitters, the zero on all vibration
transmitters must be adjusted to provide a
4.0mA output to ensure the proper opera-
tion of these messages.
“Hotwell Condensate Low Level”
The condensate level in the steam condenser hotwell
has been below the low-level switch actuation point
causing the input to the Digital I/O Expansion board
to be open for 5 continuous minutes. The chiller can
only be started after the level rises above the actuation
point of the switch closing the input to the Digital I/O
board expansion, and the START/STOP control switch
is placed in the STOP-RESET (O) position.
“Hotwell Condensate High Level”
The condensate level in the steam condenser hotwell
has been above the high-level switch actuation point
causing the input to the York I/O board to be con-
tinuously open for the TDSP13-Hotwell High Level
Timeout delay shown on the Time Delay Alarm/Shut-
down Setpoints Screen. This message is also displayed
and the chiller shut down if the Hotwell Level Trans-
mitter input signal connected to the Analog I/O Expan-
sion Board remains continuously above the HLSP2-
Hotwell High Level Cutout setpoint for same time
delay. The chiller can only be started after the level
falls below the actuation point of the switch and pro-
grammable shutdown setpoint, and the START/STOP
control switch is placed in the STOP-RESET (O) posi-
tion.
“Turbine Overspeed”
The speed has exceeded the SSP8-Overspeed Shut-
down setpoint shown on the Alarm/Shutdown Setpoints
Screen. The START/STOP control switch must be
placed in the STOP-RESET (O) position before start-
ing the chiller.
“Slow Roll Overspeed”
The speed has exceeded the SSP11-Critical Band Base
Speed setpoint shown on the Speed Setpoints Screen
without the ramp tp rated speed being initiated. The
START/STOP Control Swith must be placed in the
STOP-RESET (O) position before starting the chiller.
“Compr Thrust Bearing-Limit Switch Open”
(All except "J" Compressors)
The High Speed Thrust Bearing Limit Switch Contacts,
connected to TB7-313 and TB7-324 have opened. This
occurs when the Bearing position decreases to < the
allowed position.
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