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Reading a pivot control panel: depth, direction and the end gun
Most of what a pivot does in a season is decided at one cabinet. The panel is not complicated, but two of its controls are routinely read as something they are not — and both of those set how much water the crop gets.
The percentage timer sets depth, not speed
The timer sets the duty cycle of the last tower: the share of each minute the outer tower spends moving. Because every other tower keeps station on it, that single figure sets how fast the whole machine turns — and therefore how much water lands on each pass. Turning it down does not water more gently; it waters more deeply.
Direction, and why the end gun follows the corners
Forward and reverse are simple. The end gun is not: it is opened on the corners and shut off around the rest of the circle, driven from the panel by the end gun valve. That is what extends coverage into the parts of a rectangular parcel the circle would otherwise miss, without over-watering the arc where it is not needed.
The readings worth taking every start
| Reading | Where it comes from | What a bad number means |
|---|---|---|
| Pressure | Manometer at the pivot point | A tiring pump, a partly closed valve or a leaking hydrant — nothing on the panel trips on this |
| Voltage | Panel voltmeter | Low or unbalanced supply, which is what burns gearmotors |
| Hours | Running-hours counter | Service intervals and gearbox oil changes are scheduled against this figure |
Digital or standard
The digital panel adds programmable cycles, end-gun sequencing, fault alarms and remote monitoring — which is what makes scheduled irrigation practical when the machine is an hour away. The standard panel carries the percentage timer, direction and forward/reverse with the contactors sized for the machine.
| Standard panel | Digital panel | |
|---|---|---|
| Percentage timer | Yes | Yes |
| Direction / reverse | Yes | Yes |
| Programmable cycles | – | Yes |
| End-gun sequencing | – | Yes |
| Fault alarms | – | Yes |
| Remote monitoring | – | Yes |
| Fits an existing machine | Yes | Yes |
Common questions
What does 50% on the timer mean?
The outer tower moves for half of each cycle. Because the rest of the machine keeps station on that tower, it halves the speed of the whole machine and roughly doubles the depth applied per pass.
Can I fit a digital panel to an old machine?
Yes. Both the standard and the digital panel are supplied for new builds or as a retrofit, with the contactors sized for the machine.
Why does my end gun run on part of the circle only?
That is correct behaviour. The end gun valve is driven from the panel to open on the corners and shut off elsewhere, so the arc that does not need extra reach is not over-watered.
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