York Millennium YCAS 310, Установка, эксплуатация и обслуживание

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FORM 201.10-NM3
73
YORK INTERNATIONAL
A/L Start: Dial Setting = (1.1 x RLA) / 350
WYE-Delta Start: Dial Setting = (0.64 x RLA) / 350
The Mechanical HP (Hight Pressure) Cut-out will also
cause the low current safety to activate. If discharge
pressure exceeds 405 PSIG (HP cut-out), the cut-out
will open. When the cut-out opens, 115VAC power will
be removed from the Motor Protector Module. When
power is removed from the module, its MP contacts
will open, breaking the 115VAC fed to the 1CR (Sys 1)
or 2CR (Sys 2) control relay. When a control relay is
de-energized, power is removed from the compressor
contactors which shuts the compressor off. When the
motor contactor de-energizes, motor current falls to
zero. The low motor current is sensed by the micropro-
cessor and the system is shut down.
Auto-restart will be permitted after shutdown, when dis-
charge pressure drops below 330 PSIG and the HP
contacts close. A fault lock-out will result if safety thresh-
olds are exceeded three times in a 90 minute period.
2.6 PRINTOUT ON FAULT SHUTDOWN
If an optional printer is installed, the contents of History
Buffer #1 will be sent to the printer any time a fault shut-
down occurs. This will allow record keeping of individual
faults, even if they do not cause a lockout of the system.
This information may be useful in identifying developing
problems and troubleshooting. See also Section 4.7.
The No Run Permissive fault messages will not be
stored in the History Buffer and will not cause an auto
printout.
NOTE: Due to extreme operating conditions or sys-
tems where control deficiencies are present,
occasional faults may occur with the automatic
printout. This is not a cause for concern.