Posted 2/10/2018 17:54 (#6568782 - in reply to #6565730) Subject: RE: Field Iq half section shutoff
Southern Minnesota Between Freeborn & Wells
Most clutch systems complete a 12 v circuit to disengage a row or section clutch on planters or drills. That is they supply power or ground to cause the clutch to disengage. When the circuit is released by the controller, the clutch will revert to an engaged status.
Many systems have a common ground and apply power to cause the clutch to disengage. Ag Leader systems have a common constant hot and complete the ground to a section to stop it. But either way a complete circuit STOPS planting. This results in a somewhat fail safe arrangement, since a failure would usually result in planting.
This logic is opposite of that of section control on a sprayer since a complete circuit in them causes the valve to open.
Relays are often used with half width disconnects since they may impose a sizable electrical load on the clutch controller. With a HD 12V relay, the load of the clutch can be carried by direct connection to the battery with appropriately sized cables. The output from the controller is wired to one side of the coil. Depending on the controller the other coil terminal goes to ground or constant hot. The Common and Normally Open terminals are used for the power connection to the clutch.
Relays can be used to reverse the on/off logic but this usually not necessary or desirable. With a few systems that use sprayer logic, this is sometimes necessary. Some early EZ Boomm controllers needed this.