Great Plains NTA2000D Operator Manual - Manual (Page 56)

Multi-function Drill Control
38p
Set Alarm Speed for Distribution Shaft
1.
Select the channel.
2.
Hold to enter program mode 1.
The alarm threshold is displayed after 3 seconds. Continue holding the button and…
3.
PRESS to select the digit to change.
4.
HOLD to change the selected digit.
5.
RELEASE to select the next digit and repeat as above, otherwise simply release
both buttons. The instrument will then return to the normal display mode.
Half Width Drilling
Some drills have a half width facility. Disengaging the metering shaft will result in the shaft
speed alarm being triggered. In this case you must set the instrument to disable the
metering shaft alarm, and also to accumulate area based on half width.
This can be carried out by selecting the shaft speed channel . Press and holds the
button for 2 seconds. The display will show “HaLF”, indicating that the shaft alarm will now
be ignored and the area accumulation reduced by 50%.
If this action is forgotten, the alarm will be triggered and the instrument will default to the
shaft speed channel . At this time simply press and hold the button for 2 seconds.
The display will now be ignored and the area accumulation reduced by 50%.
The instrument will revert back to normal operation when either a shaft speed signal is
received (i.e. the seed shaft has been mechanically re-engaged for full width operation), or
the instrument is unplugged and plugged back in again.
Disabling the Distribution Shaft Alarm
Alternatively, you can turn off the alarm by pressing and holding the button for 5
seconds with the shaft speed channel selected. The display will then show ‘OFF’ when this
channel is selected. The alarm function will stay off until the instrument is unplugged and
plugged back in again.
Alarm Delay Time
Some crops – notably oilseed rape (canola) are drilled at very low rates so
the seed shaft runs extremely slow and the instrument may sense that the
shaft has actually stopped, thus triggering the shaft speed alarm. The
programmable delay time can prevent the alarm being triggered needlessly
in such a situation.
When drilling at higher rates, a long time delay is equally undesirable. In
this case a shorter time delay can be programmed.
Default delay time = 40 seconds
Minimum delay time = 5 seconds