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D877 MGB Rev01 HE250.docx
Ready signal RDY from the card to the electrical panel waiting for commands.
ENR activation solenoid valve VNR release
ERS activation of the VSC solenoid valve release
Section 3.4.1 describes the functional self-control cycle redundancy downhill
Section 3.5 describes the verification of self-monitoring provided for in section 6.3.13 of the EN81-20 norm.
3.4.1
Cycle with self monitoring functional redundancy
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1/4 - SIGNAL WAIT (DSP= 00)
Ready signal RDY from the card to the electrical panel waiting for commands.
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2/4 - ACTIVATION VALVE ENR (DSP= A1)
Power input of only solenoid valve ENR
The electronic board detects the necessary conditions and activates the output solenoid ENR, which controls
the valve VRN.
The card goes in error (error code = 19, DSP = E3) in one of the following streams situations:
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Incorrect coil power consumption solenoid valvole ENR
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Valve position VSC not on Zero
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Power input ENR Solenoid valve for more than 12 s.
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3/4 - SIGNAL WAIT (DSP= A2)
Ready signal RDY from the card to the electrical panel waiting for commands or ERS valve activation.
The card goes in error (error code 19, DSP = E3) if the waiting time signals exceeds 12 s.
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4/4 - ACTIVATION VALVE ERS (DSP= A3)
Power input of only valve ERS solenoid.
