Burkert 8681 - 22 SERVICE MODE; MANUAL OVERRIDE; Magnetic Manual Override

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Service Mode / Manual override
22 SERVICE MODE / MANUAL OVERRIDE
Bydefault,thecontrolheadprovidesthefollowing(e.g.forservicepurposes):
• a magnetic manual overridewhichiseasilyaccessiblefromtheoutsideforsolenoidvalve1(2/A1)
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as
well as
•
a mechanical manual override accessiblewhenthehoodisopenoneachequippedsolenoidvalve–
see chapter “22.2Mechanicalmanualoverride”.
22.1 Magnetic manual override
Magnetic manual
override tool
Markings for
magnetic
manual override
Fig. 49: Magnetic manual override / magnetic manual override tool on the basis of encoded magnetic elds
Irrespective of the signal of the higher-level control, the magnetic manual override sets in the Automatic mode
theoutputofthesolenoidvalveV1
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electrically to an ON signal and, if control pressure is present, switches
the 2/A1 output
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, in manual operating status, the manual override cannot be used.
However, if the output of solenoid valve 1
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isactivatedbythecontrol(ONsignalfromthehigher-level
control),thisswitchingstatuscannotbesettoanOFFsignalwiththemanualoverride!
Activation/deactivation of this function is possible using the PC service program. The factory setting is
“magneticmanualoverridefunctionactive”,i.e.thefunctioncanbeused,itisnotdisabled.
The connection to the PC is made via the service interface. Details are described in the “PC Service
ProgramType8681”softwaremanualunderthe“SYSTEM/Start-up”menuoption(fortheIO-LinkandbüS/
CANopendesign,thechangeovercanbecarriedoutviatheBürkertCommunicator).
Caution!
When the magnetic manual override (solenoid valve 1
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) will be actuated:
•the peripheral fault bit is set on the AS interface design.
•the mode is switched to "Manual override active" for the DeviceNet design and can be read out.
•
thefeedbacksignals(valvepositionsS1-3,externalinitiator)functionaspernormaloperation.
Always observe the safety guidelines and the system statuses!
________________________
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bothsolenoidvalvesareactuatedsimultaneouslyforthedesignfordouble-actingactuators(seechapter“19 Special
designs”onpage127)
english
Control Head Type 8681