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hydraulic planter drive problem riddle
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WTW
Posted 6/26/2022 11:39 (#9721921 - in reply to #9721768)
Subject: RE: hydraulic planter drive problem riddle solution


Winkler, Manitoba Canada
MiradaAcres - 6/26/2022 08:41

Sounds like a rate ontroller issue. Did it do it at high speeds with less than 4 sections on? Most rate controllers use power to apply section valves which means you are running 9 solenoid coil while planting. Since the PWM coil current varies with speed/population it sounds like the PWM driver is getting over current at high speeds. Since Brand PWM uses a 1A coil it sounds to me like low voltage on controller. Is rate controller wired direct to battery?

ETA: When controller voltage drops it causes coil voltage to drop. The bypass coil on the first motor could be partially open which would cause the PWM driver to increase flow and load up system since flow needs to increase. Really need more info, but I would say motor is fine until you swap a bypass valve with another motor and see if the problem follows the vbypass valve. Removing the shutoff valve does little to prove since a standard hydraulic plug and open valve in a 2 port cavity are the same hydraulically.


1) While planting none of the solenoid valves other than than the PWM valve are powered so this is not a voltage problem. Solenoid valves are active to provide section control at field edges and borders only. In any case, the solenoid valves are fired via relays powered from the battery.

2) "The bypass coil on the first motor could be partially open which would cause the PWM driver to increase flow and load up system since flow needs to increase" The speed encoder is on a fifth idler motor before the four that run the planter. A partially open valve on the first planter motor would have no effect on the Rowflow control as it receives speed info from the the idler motor.

I will stick with our diagnosis. Easy to check as we have a new spare motor on the shelf which will be installed.

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