Engage Lookaheads
Engage lookaheads compensate for the amount of time between when a section is engaged and when product
begins to hit the ground. They can be congured from 0 to 30 seconds, however in most cases they will be less
than 10. Larger lookahead values cause the sections to begin applying product earlier yielding more overlap.
Once a section has begun to engage, it cannot be disengaged until its lookahead period has expired. For example,
if a section with an engage lookahead of 15 seconds begins to engage, but then encounters seeded area, it will
remain engaged for at least 15 seconds. The only exception to this rule is that a section may disengage early if it
leaves the eld boundary.
Disengage Lookaheads
Disengage lookaheads compensate for the amount of time between when a section is engaged and when product
stops hitting the ground. They can be congured from -30 to 30 seconds, however in most cases they will be less
than 10. Larger disengage lookahead values cause the sections to disengage later yielding more overlap.
Product vs. Opener Lookaheads
There are two main sources of mechanical delay that engage/disengage lookaheads account for:
• the time it takes for the openers to get into the ground
• the time it takes for the product to ow from the tank to the openers.
The iCon system accounts for each of these separately. The user may set unique lookahead values for the
openers and each of the product tanks.
Lookahead examples
1. In example one, the engage lookaheads are set to 6 seconds and the disengage lookaheads are set to -4 seconds. The sections
engage 6 seconds early, yielding possible overlap as the lines ll. The sections also disengage 4 seconds before the headland
yielding a possible two second miss where no product is applied.
2. In example two, the engage lookaheads are set to 3 seconds and the disengage lookaheads are set to -2 seconds. This yields a
possible 3 second miss as lines ll going into the pass, there should be little overlap as the lines clear out going into the head-
land.
3. In example three, the engage lookaheads are set to 0 seconds and the disengage lookaheads are set to 0 seconds. This yields 6
seconds of possible miss entering the pass and two seconds of overlap at the end of the pass.
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Sectional Control Technology lookaheads
Note: Look ahead times are the responsibility of the operator and can vary due to machine, product and environmental conditions.
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