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D877 MGB Rev01 HE250.docx
2.19 Maximum pressure valve test (DSP=PP, HP)
Block the system to exclude the possibility of travel.
Set the working selector RSW = 8 (DSP=PP) and then press S1 button until appear HP on display.
This prepares the valve unit to execute the next upward working cycle with a progressive pressure starting and
without flow error condition.
To close the ball valve.
Run a normal upstroke (to see the point UPWARD 2/8 in the present instruction) it will be progressive and
takes more time than usual (at least 10 s).
At the end of the upward maneuver the board no more provide the signal RDY if not performing a new maximim
pressure test, by pressing the button S1 as described above, or a normal maneuver setting the selector RSW
= 0.
Note: As an alternative to the use of RSW switch, you can activate the test condition setting parameter 704 to
the value 1. At the end of the test the value of the parameter returns automatically to 0.
2.20 Error condition
Any operation must be disabled if the error signal ERR on relay is active. For error handling see the capitol 5
"Parameters and Errors codes"
You can force on the error condition the signal ERR by setting the parameter 463 to the value 1
This allows to verify the block of the control panel to the switching of the error signal error ERR.
At the end of the test remember to set the value of parameter 463 to 0 to resume the normal state of error.
