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K.
Low Pressure Installations
For dryers designed with operating pressure below 10 psig, customer must supply
a small (tubing) pressurization line from higher pressure source. This will ensure
that regeneration pressure is high enough. Regeneration circuit can be
pressurized through blower housing valve V13.
II.
SAFETY
A.
Dryer Power switch to be in OFF position when not in regeneration cycle.
B.
Use EXTREME CAUTION when working in the vicinity of the dryer.
C.
Relieve pressure before servicing dryer or associated equipment.
D.
Make sure that the relief valve is locked open before operation.
E.
Disconnect power before servicing dryer.
F.
Manual drain valves will eject water, oil, particulates and gas under partial
pressure when operated. Proper precautions must be taken.
G.
Condensate may contain oil or other contaminants. Follow all applicable
regulations for safe handling and disposal.
H.
Purge the system to remove oxygen (contained in air) prior to startup.
I.
Keep electrical closures closed and bolts tightened securely.
III.
DRYER CONTROLS
A.
Dryer Power Selector switch (SS1)
This selector switch, when moved to OFF position, removes all control power from
dryer except for enclosure heater (optional), heat trace (optional), and moisture
analyzer. All dryer action stops immediately. Rotating switch to ON position
restores control power but does not start dryer. Wait momentarily to allow PLC to
power to ready state.
B.
Emergency Shutdown pushbutton (ESD1)
Push-pull operation should be wired in series with other plant ESD buttons. Plant
master control relay contacts should be wired in with dryer control system to
remove power from dryer in an ESD condition. Refer to electrical schematic for
details.
C.
Dryer Alarm Light (1LT)
Should an alarm occur, this light will illuminate or flash depending on severity of
alarm. Steady ON is an alarm that needs immediate attention. Flashing ON is an
alert that maintenance is needed, or condition has occurred where operator action
is needed to improve quality of dryer operation. Refer to alarms (section XI) for
details. Dryer alarms listed include: Heater sheath over-temperature, Heater outlet
temperature high, Cooler outlet temperature high, Cooler/Blower overload,
Thermocouple failure, and communication failures. These are shown on operator
terminal display under alarm page.
D.
Operator Control Station
A display is present on control panel face that enables operator to gain valuable
information about status of dryer, enables operator to change setpoints, and aids
troubleshooting should an alarm occur.
password to prevent tampering. Refer to operator terminal (section IV) for details.
NG-SR IOM
Changing setpoints is protected by
5
PSB INDUSTRIES
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