FTS MAXI-COOL - Miscellaneous Menu

Maxi-Cool
User Menu
Rev 007, 04/12 23
© SP Scientific 2012
Miscellaneous Menu
dP
Decimal Point
PLOC
Parameter Lock
PF
Power Failure
rdY
“Ready”
Temperature
Band
Parameter Lock.
0=off, 1=on. If PLOC is set to 0, the PID settings may be changed
during idle or while the system is running, thus allowing system adjustment. If PLOC is set
to 1, then the PID can only be adjusted during the IDLE state and cannot be set while the
system is running.
Decimal Point.
If set to 0 (no), process readout is displayed to the nearest integer value. If
set to 1 (yes), process readout is rounded to tenths.
Power Failure/Recovery.
If this parameter is set to 0, the power-recovery
system is off. Application of mains power will result in an idle system. If this
parameter has been set to 1, application of mains power will result in an idle
condition had the system been idle when the power was removed, or a run
condition had the system been running when the power was removed.
“Ready” Temperature Band.
The temperature band about setpoint, in
degrees, by which the system may be defined as “ready.” The “ready”
value (0/1) is normally available by means of a query to the chiller via the
RS-232.
Note:
Temperature operates in conjunction with the Ready Time described
by the next parameter.
rdYt
“Ready”
Time Constant
“Ready” Time Constant. A time constant, in seconds that the software uses to
determine the “ready” condition. A simple temperature band is useless for ready
determination if the process has not yet stabilized at setpoint. The initial
excursion into the Ready Band may be followed by overshoot beyond the band,
yielding a false signal. The process temperature is therefore continuously
integrated across a period of time defined by this constant to ensure that
stability has indeed been achieved. Since the stability is determined by
integration, SLOW processes will tend to yield a Ready in less time than the
actual constant value. FAST processes that have slewed across a wide span
will yield a Ready in a time longer than the constant due to early windup. This
is, however, consistent with the probability that the process will overshoot the
band.
dEg
Temperature
Scale
Temperature Scale. Degrees: Centigrade=0, Fahrenheit=1, Kelvin=2.