Thoreson-McCosh HMI/T-3, Инструкция по эксплуатации

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Thoreson-McCosh Inc
EDITION 05/07/10 16 IB201001.doc
SECTION 6.2 VIEWING CURRENT CYCLE TIMES
Pressing the Time/Autostart Setpoints button twice will display the current cycle time, and
the previous cycle time (up to 999 minutes).
SECTION 6.3 SETTING THE CURRENT DAY AND TIME
Pressing the Time/Autostart Setpoints button three times will display the current time and
day preset at the factory, and allow the user to enter in a new time and day if required.
SECTION 7 DEWPOINT
SECTION 7.1 DEWPOINT SETPOINTS
The DEW POINT SETPOINTS key displays the dew point shift setpoint, dew point shift
condition (on or off) and dew point alarm setpoint. All Thoreson-McCosh material dryers
have been designed to operate at -40

dewpoint. The dew point shift option keeps the
desiccant beds from shifting until its setpoint is reached. Taking the dryer unit off the time
line schedule and allowing the desiccant bed to continue to saturate with moisture until it
reaches a higher dewpoint set point. The dryer will incur fewer regeneration cycles. Fewer
regeneration cycles means a huge reduction of standard operating cost. (NOTE: Minimum
time is the standard cycle time preset at the factory). That is, the beds do not shift until the
dew point of the process stream reaches the setpoint value after the cycle timer has timed
out.
NOTE: Since the Dewpoint sensor in many cases will read
–
40 when the sensor goes bad,
If the Dewpoint Shift option is turned on, the unit will only delay the shift for two additional
cycle times and then the unit will force a desiccant bed index.
SECTION 7.2 SETTING THE DEWPOINT SHIFT SETPOINT
Pressing the DEWPOINT SETPOINTS key once displays:
D e w p o i n t S h i f t
S e t p t = -
3 5 ° F
N e w = -
_ _ ° F
P r e s s E N T E R
FIGURE 7.2.1 DEWPOINT SETPOINT