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AutoFire® Kiln Controller
Mode: User Program
The Vent Fan Option is activated under Level 2 Options (if the controller was ordered with this option).
If the USER program ramp option is not active, then the vent fan is "off"
If Vent Fan is active, the vent fan operation is controlled by the 4
determines during programming whether the Vent Fan is "on" or "off" for each ramp segment.
1.
If the user specifies that the Vent Fan should be "off", then the vent fan is "off" with no other conditions
evaluated.
2.
If the kiln is programmed to heat up, then the vent fan is "on" (regardless of whether the controller is in
the ramp, dwell, recovery, or hold states).
3.
If the controller is in a power-recovery mode and heating up, then the vent fan is "off".
4.
If the controller is in a power-recovery mode and cooling down, then the vent fan is "on".
5.
If the controller is holding at a temperature, then the vent fan is "off".
Note: If it is desired to have vent fan "on" during the dwell portion of a cooling segment, the operator can
break the dwell segment into two parts. The first segment can specify a zero dwell time and the second
segment specify the same dwell temperature with the desired dwell time. For example, if the operator wants
the vent fan to be "on" during the dwell portion of cooling segment 2 of the following User Program, then the
operator can divide segment 2 into segments 2 and 3 as follows:
Seg #
1
2
1
2
3
For the two-segment program, the vent fan will be "off " during the dwell state of segment 2, even when the vent
fan has been set to "on" in the program.
For the three-segment program, when two dwell temperatures are the same, the software interprets the 999 ramp
rate as a positive number, so during segment 3 dwell state, the vent fan will be "on". Irregardless of the mode of
operation, whenever the controller is in the abort state "Abrt", the vent fan is turned "off". The "Abrt" state can
be a result of the operator aborting the active firing cycle, or can be a result of an error condition that terminated
the firing cycle.
Two Segment Program
Ramp
Dwell
Rate
Temp
500
1000
(-)300
750
Three Segment Program
500
1000
(-)300
750
999
750
User's Guide
th
segment in the User Program. The User
Dwell
Vent
Time
Fan
30
ON
60
ON
30
ON
0
ON
60
ON
38
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