Farmer 400
Fav 700
Fav 900
Power lift / Electrohydraulic control EPC
Rear power lift - functional description
A
General
Fav 900 chassis number 23/3001 and up
29.11.2000
8610
000001
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a
3/8
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Rear power lift - functional description
c) Mechano-hydraulically
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Theoretical depth of power lift is determined by setpoint specification and regulated, i.e. adapted as
function of hybrid control system.
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Lowering speed actually achieved, however, depends on implement weight and oil viscosity, i.e. it is
impossible to lower three-point linkage in EPC mode without implement and with cold oil.
Text-module
3. "EPC transport"
"EPC transport" setting is automatically reached when
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power lift has reached end position with "Lift = END" (detected by rear position sensor B030)
Explanation of functions:
a) Electrical
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Block multiway valve, consisting of AV3 and AV4, is in "EPC" position
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This position is detected by solenoid switch S048 and transmitted to EPC box A005 pin 12, i.e. EPC
box is active.
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Actual position is detected by rear power lift position sensor B030 and transmitted as voltage signal
to EPC box A005.
b) Hydraulically
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Without LS command and without active intervention of LS pump PR
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Implement weight generates hydraulic counterpressure in lift cylinder.
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Dynamic peak pressures while driving are brought under control by 230 bar pressure-relief valve in
EPC valve.
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Leak-free integrity of system is ensured by integral control valve in "Lower" valve (i.e. with this EPC
valve fitted, no separate, hydraulically resettable non-return valve is needed any longer).
Text-module
4. "DA lift"
Text-module
5. "DA lower" (pressing downwards)
The "DA lift" and "DA lower" commands can only be activated by
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analogue setpoint command of second valve (normally "blue" at crossgate lever)
Explanation of functions:
General:
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For power lift DA function second control valve 1.2/Y016 with A and B connections (corresponding to
- and +) is used instead of EPC valve.
a) Electrical
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Block multiway valve, consisting of AV3 and AV4, is in "DA" position.
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This position is detected by solenoid switch S048 and transmitted to EPC box A005 pin 12, i.e. EPC
box is no longer active in supplying power to control valve.
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"Lift" or "Lower" command from external buttons (S027-S030) is transmitted from EPC box via K-bus
to ECU A002.
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Set lift height limit at terminal is not active, and EPC end shutoff is also ignored.
Fav 700 single ECU
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The single ECU A002 is responsible for actuating the electrohydraulic control valves (and for the
transmission); the command for the valve comes via the transmission bus (=G-bus).
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