York SSS 14L-B, Руководство по эксплуатации

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JOHNSON CONTROLS
25
FORM 160.00-O2
ISSUE DATE: 04/30/2019
5
SECTION 5 – CYCLING SHUTDOWNS
GENERAL INFORMATION
Whenever a Cycling Shutdown is generated by the
Logic/Trigger Board, a series of events will occur.
• If the chiller is running at the time of the shut-
down, the Logic/Trigger Board will turn off the
SCR gate outputs.
• If the chiller is running at the time of the shut-
down, the OptiView Control Center will start a
coastdown period (150 seconds for centrifugal
chillers, or a 2 minute lockout for screw chillers).
• The K1 relay will de-energize causing an open
circuit between TB-1-16 and TB-1-53. This ac-
tion will indicate to the OptiView Control Center
that the LCSSS has shutdown. The K1 relay will
remain de-energized until the cause of the shut-
down has been corrected.
• The Logic/Trigger Board will send a shutdown
code via the serial communications link to the
Micro Board in the OptiView Control Center. The
Micro Board will interpret the shutdown code,
and display a shutdown message on the display of
the OptiView Control Center.
After the coastdown period has timed out, the chiller
will automatically restart, if the shutdown is no longer
active, and if the Compressor Switch is still in the Run
position.
HIGH SUPPLY LINE VOLTAGE
The Logic/Trigger Board monitors the three phases of
input voltage via the negative SCR cathode connec-
tion. The DSP will determine the phase to phase RMS
voltage and send this information to the main system
microprocessor. The main system microprocessor will
compare these voltages to shutdown thresholds in the
chart below. If the input voltage exceeds the shutdown
threshold for 20 continuous seconds, then a Cycling
shutdown will occur. This shutdown is disabled for the
first 20 seconds of the starter run, to prevent nuisance
shutdowns from voltage spikes during start. The voltage
range is programmed on the OptiView Control Center.
If no voltage range is programmed, then this shutdown
will be disabled. Refer to OptiView Control Center Ser-
vice form for your style of chiller (refer to ASSOCIAT-
ED LITERATURE in this form, page 3, for the proper
form number).
The shutdown message displayed will be
“LCSSS -
HIGH SUPPLY LINE VOLTAGE” .
Possible Problems
• Verify that the proper voltage range is selected on
the OptiView Control Center.
• Verify proper line voltage is being applied to the
starter.
INITIALIZATION FAILED
After power has been applied to the OptiView Control
Center, the Micro Board attempts to communicate with
the Logic/Trigger Board via the serial communication
link. If the Micro Board has tried to communicate with
the Logic/Trigger Board ten times, and the Logic/Trig-
ger Board has not responded, a Cycling shutdown will
occur. Even though the shutdown was recorded, the
Micro Board will continue to try to communicate with
the Logic/Trigger Board. Since the Micro Board at-
tempts to communicate with the Logic/Trigger Board
every two seconds, the shutdown will occur approxi-
mately 20 seconds after power was applied.
The shutdown message displayed will be
“LCSSS
INITIALIZATION FAILED” .
TABLE 5 - HIGH SUPPLY LINE VOLTAGE
VOLTAGE RANGE HIGH SUPPLY LIMIT – STOPPED HIGH SUPPLY LIMIT – RUNNING
Disabled None None
200 - 208 226 227
220 - 240 261 262
380 414 415
400 435 436
415 453 454
440 - 480 523 524
550 - 600 654 655