Chromalox TEMPERATURE CONTROLLER 1604-7 - Manual (Page 23)

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DIRECT ACCESS TO SET POINT
When the device is in AUTO mode and in “Normal
Display Mode”, it is possible to access directly to
set point modification (SP or SP2).
Pushing
s or t for more than 2 s, the set point
will begin changing.
The new set point value becomes operative since
no pushbutton has been depressed at the end of
2 s timeout.
MANUAL FUNCTION
The MANUAL function can be accessed (only if
enabled by P34=On) by depressing the MAN
pushbutton for more than 1 sec.
The command is accepted and executed only if
the display is in "Normal Display Mode".
When in MANUAL mode the LED's MAN
annunciator will light up while the lower display
shows the power output values.
The value of "rEV" is shown in the two most signifi-
cant digit field while the value of "dir" (if present) is
shown in the two less significant digit field.
The decimal point between the two values will be
flashing to indicate instrument in manual mode.
NOTE :
- A graphic symbol " " is used for "rEV"= 100
- A graphic symbol " " is used for "dir"= 100
The power output can be modified by using s
and t pushbuttons.
In manual mode the output resolution is equal to 1%.
By depressing, for more than 1 second, MAN
pushbutton the device returns in AUTO mode.
The transfer from AUTO to MANUAL and
viceversa is bumpless (this function is not
provided if integral action is excluded).
If transfer from AUTO to MANUAL is performed
during the first part of SMART algorithm (TUNE)
when returning in AUTO the device will be forced
automatically in the second part of the SMART
algorithm (ADAPTIVE).
At power up the device will be in the AUTO mode
or as it was left prior to power shut down
depending on P35 configuration selection.
NOTE:When start up occurs in Manual mode with
power output set to 0, the control outputs will be
in accordance with the following formula: "rEV"
output - "dir" output = 0
LAMP TEST
When it is desired to verify the display efficiency,
push FUNC pushbutton for more than 10 s. The
instrument will turn ON, with a 50 % duty cycle,
all the LEDs of the display (we define this function
"LAMP TEST").
No time out is applied to the LAMP TEST.
When it is desired to come back to the normal
display mode, push FUNC pushbutton again.
During the LAMP TEST the instrument continues
to control the process but no keyboard functions
are available (exception made for the FUNC
pushbutton).
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