Chromalox 1601, User Manual, Page: 16 / 32

11
Pushbutton functions:
FUNC = Stores the new value of the selected
parameter and goes to the next
parameter.
SMART = Enables or disables the SMART
function and scrolls back all the
parameters without storing them.
s
= Increases the value of the selected
parameter or toggles the display
between the set point value and the
measured value.
t
= Decreases the value of the selected
parameter.
t
+ FUNC = Enables/disables the "LAMP TEST"
NOTE : a 10 seconds time out becomes opera-
tional during parameter modification.
If, during operator parameter modification, no
pushbutton is pressed for 10 seconds, the
instrument reverts automatically to the “normal
display mode”. The new setting of the last
parameter modified is going to be memorized,
prior to the time out, only if the FUNC pushbutton
was depressed.
MANUAL RESET OF THE ALARMS
If the alarm has been configured as a latched
alarm, the alarm status persists after the alarm
condition disappears.
To reset the alarm, push the FUNC pushbutton
and select the "n.rS" parameter (the display will
show "n.rS" and "OFF"). Using the
s
and
t
pushbuttons select "ON" and push the FUNC
pushbutton again.
The alarm cannot be reset until the alarm
condition has disappeared.
SMART ALGORITHM
The SMART feature automatically sets the best
control action.
To enable the SMART function, push the SMART
pushbutton for more than 1.5 s, when the
instrument is in normal display mode. The SMART
LED will light continuously or flash according to
the algorithm automatically selected.
When the smart function is enabled, it is possible
to display but not to modify the control parameters
(PB, TI, TD and rC).
When the traditional control (PID) is desired, push
the SMART pushbutton again (for more than 1.5 s)
to turn the "SMART" OFF. The instrument
maintains the "SMART" set of control parameters
but allows parameter modification.
NOTES :
1) The SMART function uses a derivative time equal
to 1/4 of the integral time.
2) The limits of the proportional band set by the
SMART function are programmed by P16, P17
and P18 parameters.
3) The lower limit of the integral time set by
SMART function is programmed by P20
parameter.
4) When ON/OFF control is programmed (PB=0),
the SMART function is disabled.
5) The SMART enabling/disabling can be
protected by the security code (see P15
parameter).
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