York SSS 14L-B, Руководство по эксплуатации

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JOHNSON CONTROLS
23
SECTION 4 – SAFETY SHUTDOWNS
FORM 160.00-O2
ISSUE DATE: 04/30/2019
4
The YR chiller has a “MOTOR – PHASE ROTA-
TION” fault. This is not a fault of the LCSSS. This
fault is caused when the motor is turning in the wrong
direction. This fault is caused by the motor wiring be-
tween the LCSSS and the chiller motor being reversed.
The shutdown message displayed will be
“LCSSS -
PHASE ROTATION” .
Possible Problems
Verify the phasing of the input power wiring.
SHORTED SCR
This shutdown is active any time the starter is not run-
ning. Once this shutdown becomes active the main sys-
tem microprocessor starts to evaluate the voltage across
the SCRs via an opto-coupler. If the output of the opto-
coupler is low (implying the SCR is turned on or short-
ed) for 5 continuous seconds, and the RMS phase volt-
age for that phase is approximately 90% of the selected
input voltage range a Safety shutdown will occur. If no
voltage range has been selected on the OptiView Control
Center, than the voltage check will not be performed.
To help eliminate nuisance trips, this shutdown can be
disabled from the OptiView Control Center. Refer to
the OptiView Control Center Service form for your
style of chiller (refer to ASSOCIATED LITERATURE
in this form, page 3, for the proper form number).
The shutdown message displayed will be
“LCSSS -
PHASE X SHORTED SCR”
, where X is either A, B
or C, corresponding to SCR phase assemblies A, B or
C respectively.
Possible Problems
Verify if one of the SCRs are shorted.