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D877 MGB Rev01 HE250.docx
2.15 Upward working cycle
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UPWARD 1/8 - STATIONARY (DSP=1J1J or OFF)
Ready signal RDY from board to control panel during the waiting commands
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UPWARD 2/8 - STARTING REQUEST (DSP=u1J)
To activate Upward UP and High Speed HSP command input and make put on the solenoid valve ERS. The
HSP high speed command can be replaced by MSP maintenance command (P454=0) or work together to
signals MSP (P454=1), SP1 o SP2 to determine different values of high-speed set in the corresponding
parameters.
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UPWARD 3/8 - MOTOR INPUT CONSENT (DSP=u1J)
The board commutes the AVV output to give consent for motor pump starting.
In the case of non-use of this signal, the motor starting must occur after a time of about 1.5 s from the phase
2/8. In this phase, the pump oil flow is discharged in the tank at low pressure to allow a proper motor starting
and avoid hit in the cabin caused by pump direct flow to piston.
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UPWARD 4/8 - MOTOR STARTING COMPLETED AND CABIN ACCELERATION (DSP=u1)
Once finisch the motor starting (direct, star-delta or soft starter) the control must return a signal to SFY board
input. If the SFY signal is not available, it is useful to adjust the parameter P403 which sets the valve pre-
starting time, after which, however,the valve unit executes the starting phase.
The starting phase provides for the load taking, with a small movement of the cabin, and the execution of the
acceleration curve according to corresponding parameters setting: P201, P202, P203.
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UPWARD 5/8 - HIGH SPEED (DSP=u2,u6 )
The speed obtained corresponds to the parameter connected to the used high speed signal (P204 or P205,
P206, P217). In case the speed selected in the parameter corresponds to a oil flow higher than the real pump
flow rate, however the valve unit adapts its operation to the real maxim speed.
