SECTION 3 - DISPLAY MESSAGES
JOHNSON CONTROLS
185
FORM 160.54-O1
ISSUE DATE: 9/10/2014
3
Modules are indicating a temperature of less than 37°F,
the SCR Module cooling pump turns on. This is ac-
complished by disconnecting all three sensors. This
feature allows Service Technicians to run the cooling
pump while filling the cooling system by disconnect-
ing 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 generally indicative of defective wiring.
LCSSS – Invalid Current Scale
Selection
There is an invalid compressor motor current scale
jumper combination installed in the Liquid Cooled Solid
Starter Logic/Trigger Board J1. Jumper combination de-
termines allowable “100% FLA” setpoint range; 7L-35
to 260A, 14L-65 to 510A, 26L-125 to 850A and 33L-
215 to 1050A. The chiller will be permitted to start when
the jumpers are configured correctly. Refer to Solid State
Starter (Mod “B”) – Operation and Maintenance (Form
160.00-O2) for valid jumper configurations.
LCSSS – Phase Locked Loop
The Liquid Cooled Solid State Starter Logic/Trigger
Board phase locked loop circuit was not able to main-
tain lock with phase A of the power line. This could be
caused by a power line anomaly such as sag or jitter. A
power line frequency jitter of up to 3Hz/second can be
tolerated. The chiller will automatically restart when
lock has resumed.
LCSSS – Low Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor AC
Power Line Voltage, in any phase, decreased below the
low line voltage threshold continuously for 20 seconds.
The chiller will automatically restart when the voltage
in all phases returns to the restart level. The thresholds
are as follows:
SUPPLY VOLTAGE RANGE
(VOLTS)
SHUTDOWN
(VOLTS)
RESTART
(VOLTS)
Disabled None N/A
200-208 160 174
220-240 185 200
380 305 331
400 320 349
415 335 362
440-480 370 400
550-600 460 502
LCSSS – High Supply Line Voltage
The Liquid Cooled Solid State Starter Logic/Trigger
Board has detected that the compressor motor AC Pow-
er Line Voltage, in any phase, exceeded the high line
voltage threshold continuously for 20 seconds. The
chiller will automatically restart when the voltage in
all phases returns to the restart level. The thresholds
are as follows:
SUPPLY VOLTAGE RANGE
(VOLTS)
SHUTDOWN
(VOLTS)
RESTART
(VOLTS)
Disabled None N/A
200-208 227 226
220-240 262 261
380 415 414
400 436 435
415 454 453
440-480 524 523
550-600 655 654
LCSSS – Logic Board Processor
Communication between the V25 Microprocessor and
Digital Signal Processor (DSP) on the Liquid Cooled
Solid State Starter Logic/Trigger Board has been in-
terrupted. The chiller will automatically restart when
communications are restored.
LCSSS – Logic Board Power Supply
Following application of power, this message is dis-
played and a snapshot of the LCSSS parameters and
time of power failure are sent to the Control Center.
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