26
All other dwells in the program can be set in a similar
fashion by selecting “PD” followed by the relevant dwell
number.
Set the Number of Times to Repeat the Program
4. Scrolling through the main scroll until the parameter
“PLC” is displayed and then depressing the up or down
button will reveal the present setting of the loop count. This
is the number of times that the entered program will be
repeated before a continuous setpoint at the last level of the
program is achieved. By pushing the up or down button the
number of loops can be set at any value from 1 to 999.
Set the Holdback Feature
5. Scroll through the main scroll list until “HB” is displayed.
Push the up or down button to reveal the current value of
holdback. The up or down button can now be depressed to
scroll to the required value. Holdback is set in display units
and represents the allowable excursion of measured value
away from the current setpoint, either above or below,
before the program is forced into hold. The program will
remain in hold until the measured value comes within
holdback limits. This feature is active the whole time that
the program is running. When hold is forced onto the
program by holdback, the “HOLD’”legend is not illuminated
but either the “RAMP” or “DWELL” legend will flash.
NOTE
The temperature control in these
models is a programmable “and”
automatic single setpoint device.
When the program has ended, the
controller will maintain the chamber
temperature at a value equal to the
last programmed level (PL) until the
program is cancelled. It will not
automatically cool to ambient unless
last programmed level (PL) is set at
ambient. When a program is can-
celled, the controller will maintain the
chamber temperature at a value equal
to the main setpoint (SP1 or SP). To
cancel a program, depress and
release the “UP” and “DOWN” push
buttons simultaneously. Be sure single
set point mode is set to 20 or below
degrees as described earlier in this
manual.
O
PERATION
OF
P
ROGRAMMABLE
M
ODELS
