n
The tolerance field enables precise adherence to the delay
time at a specific temperature. Only once the actual tem-
perature of the tolerance range has been reached (1), will the
following segment be processed so that e.g. the ramp of the
second segment will not be started until after a delay of 2.
n
A tolerance range that has been selected too narrow can also
cause undesired delays. The tolerance range should not be too
narrow, particularly when external control is used. A larger tol-
erance was entered in segment 5, so that the desired time of
10 minutes can be adhered to even with transient processes
(3).
n
Only flat (slow) ramps should be programmed with a tolerance
range as needed. Steep ramps that are close to the maximum
possible heating or cooling rates of the device may be severely
delayed (4) if the tolerance range (here in segment 2) is too
narrow.
No time specification is possible in the starting segment (No. 1).
The temperature of the first segment is reached as quickly as pos-
sible to change to segment 2 after reaching the set tolerance.
6.17.2
Selecting a program
Personnel:
n
Operating personnel
1.
Change to the main menu.
2.
Select the menu item
Programmer
.
3.
Select one of the available programs.
6.17.3
Creating and editing programs
Note the following:
n
If a segment time of >999 h: 59 min is intended, this time must
be distributed among several successive segments.
Fig. 63: Selecting a program
Starting editing
Operation
Variocool
74
Summary of Contents for VC 1200
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Page 48: ...Fig 14 Menu structure part 2 Menu structure for Graph Clock and Standby Operation Variocool 48...
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