York SSS 14L-B, Руководство по эксплуатации

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JOHNSON CONTROLS
28
FORM 160.00-O2
ISSUE DATE: 04/30/2019
SECTION 5 – CYCLING SHUTDOWNS
TABLE 7 - PHASE LOSS
INPUT VOLTAGE RANGE
OF THE LCSSS
SHUTDOWN VALUE
Disabled 60VAC
200 - 208 60VAC
220 - 240 66VAC
380 114VAC
400 120VAC
415 125VAC
440 - 480 132VAC
550 - 600 165VAC
Possible Problems
• Many times this is a normal fault related to a
storm or lightning.
• Verify the presence of all three phase of input
voltage. An input fuse may be open.
• Verify that the proper voltage range is selected on
the OptiView Control Center.
POWER FAULT
The Power Fault Detector prevents compressor dam-
age due to a momentary interruption of motor current
(transient torque condition). This shutdown is active
after the first four seconds of a chiller start, and after
all three phases of motor current have exceeded 25%
of FLA for one second. Then, if any one phase of mo-
tor current drops below a threshold of 10% FLA for
three line cycles, a Cycling shutdown will occur. To
prevent nuisance shutdowns, this shutdown is disabled
just before the chiller is placed into a coastdown con-
dition.
The shutdown message displayed will be
“LCSSS -
POWER FAULT” .
Possible Problems
• Many times this is a normal fault related to a
storm or lighting.
• Verify that the output CT’s are reading current
correctly.
RUN SIGNAL
To start the compressor motor, the OptiView Control
Center sends a 115 VAC start signal to the Logic/Trig-
ger Board. The start signal is applied between J5-2 wire
#2, and TB1-3 wire #24 (hardware signal). This signal
is opto-coupled, and then sent to the main system mi-
croprocessor, where it is compared with a run signal
sent from the OptiView Control Center via the serial
communications link (software signal). When either
of these two signals are received by the main system
microprocessor, a 5 second timer is started. The timer
stops when the second of the two signals is received by
the main system microprocessor. If both of the signals
are not received within 5 seconds, a Cycling shutdown
will occur.
The shutdown message displayed will be
“LCSSS -
RUN SIGNAL” .
Possible Problems
• Verify that 115VAC is applied between J5-2 wire
#2, and TB1-3 wire #24.
• Check for solder cracks around J5 and TB-1.
• Verify the serial communication link cable.
SERIAL COMMUNICATIONS
This shutdown becomes active after a successful com-
pletion of initialization. If the Micro Board has tried
to communicate with the Logic/Trigger Board ten
times, or if the Logic/Trigger Board does not receive
a transmission from the Micro Board within 20 sec-
onds, then a Cycling shutdown will occur. Since the
Micro Board attempts to communicate with the Logic/
Trigger Board every two seconds, the shutdown will
occur in approximately 20 seconds. Under this condi-
tion, all information about the starter displayed on the
OptiView Control Center will be zero.
The shutdown message displayed will be
“LCSSS -
SERIAL COMMUNICATIONS” .
Possible Problems
• Verify the communication cable between the
OptiView Control Center and the Logic/Trigger
Board.
• If CR6 is blinking, but CR7 is not blinking, the
Logic/Trigger Board has failed. If both CR6 and
CR7 are blinking every 2 seconds, continue to the
next step.
• If problem is still not detected, then perform the
communication loop back test (see ASSOCIATED
LITERATURE on Page 3 for OptiView Con-
trol Center Service).