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D877 MGB Rev01 HE250.docx
2.16 Downward working cycle
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DOWNWARD 1/7 - STATIONARY (DSP=00 or OFF)
Ready signal RDY from board to control panel during the waiting commands.
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DOWNWARD 2/7 - STARTING (DSP=d0)
To activate Downward DW and High speed HSP (or SP3 if the parameter P453=1) command input and make
put on the solenoid valves ENR and ERS. The HSP (or SP3) 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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DOWNWARD 3/7 - ACCELERATION (DSP=d1)
This phase provides the execution of the acceleration curve according to corresponding parameters setting:
P301, P302, P303.
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DOWNWARD 4/7 - HIGH SPEED (DSP=d2,d6)
The speed obtained corresponds to the parameter connected to the used high speed signal (P304 oppure
P305, P306, P317).
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DOWNWARD 5/7 - DECELERATION (DSP=d3)
Upon arrival at the deceleration contact in the shaft, turn off the high speed HSP signal (or the SP3 signal if
the parameter P453=1) and the valve unit executes the deceleration curve seted up in the parameters P307,
P308 (309,310,318) and P311 for to obtain the low speed value corresponding to P312 parameter.
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DOWNWARD 6/7 - LOW SPEED (DSP=d4)
The duration of low speed phase depends on the difference between the space from the contacts of
deceleration and stopping in the shaft and the deceleration distance programmed in the parameters.
When the parameter P 456 = 1, during the deceleration and low speed phases, is calculated the distance
traveled until the stop contact that allows to run the next deceleration with a minimum low residual distance
setted in the P459 parameter. The calculation is reset when the board is off.
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DOWNWARD 7/7 - STOPPING (DSP=d5)
Upon arrival at the stopping contact in the shaft, it must turned off the downward DW signal.
