Despatch 1500 Controller - Manual (Page 38)

Page 32 Despatch/Watlow 1500 Control Instruction Manual
Step Description
1 Set points of 25 E C and 95% RH entered for S1 and S2. Event 1.1 is on. This
enables the humidity control system. This step is held for 10 minutes so that the
humidity system has sufficient time to fill up with water.
2 S1 is changed to 40 E C. S2, E1 and E2 are left blank by pressing the FCTN key
when those functions are displayed. In a set point step, blank data defaults to
previous settings, so S2 = 95, E1 = 0001, and E2 = 0000. Since Step #1 was the
previous step, by doing this if you wished to change S2 to 85% throughout the
program you only have to change it on Step #1. The step duration is 30 minutes.
Since the previous set point was 25
E , the process set point will be ramped continu-
ously from 25 E to 40 E over the 30 minute span.
3 No change in set points (S1 or S2) or events (E1 or E2). Therefore, control will act
to hold 40
E C and 95% for 30 minutes.
4 S1 is set back to 25 E C. It is ramped from 40 E C over 30 minute period.
5 Again, a hold for 30 minutes.
6 S1 is changed to -10 E C. This is ramped over a 1 second period so it is
essentially a step change. Note Event 1.1 is turned off. To protect the
equipment, humidity control generally needs to be disabled when below
freezing.
7 The control is set to wait for the CH-1 process to reach -8. All other waits
are blank so they will be ignored. Do not type zeros into wait functions that
are to be ignored. This is caused by pressing the ENTER key instead of the
FCTN key when you scroll past the function you wish to ignore. The above
is the most typical problem encountered in a wait-for-step.
8 Another hold for 30 minutes.
9 This is a jump to Step #2. Steps 2-8 will be repeated.
10 Set points are changed to 25 E C and 60%, a normal condition, before
program is ended.
11 Is a blank step (SP when viewed in CHG DATA mode). Program execution
will end here.
Table 9 Despatch Sample Program
Ecosphere Sample Program
The sample program on the following page is provided to
demonstrate the function of the unit. It is pre-programmed in
the factory and available for you to run upon installation of
your chamber. If the program has been cleared somehow,
you may wish to re-enter it as programming practice.