Woodward highprotec MRI4, User Manual

Page: 359 / 727

Blockings
Temporary Blocking
To block the complete protection of the device temporarily by a signal
In module
»Prot« the complete protection of the device can be blocked temporarily by a signal. On condition that a
module-external blocking is permitted
»ExBlo Fc=active«. In addition to this, a related blocking signal from the
»assignment list« must have been assigned. For the time the allocated blocking signal is active, the module is
blocked.
If the module »Prot« is blocked, the complete protection function does not work.
As long as the blocking signal is active, the device cannot protect any
components.
To block a complete protection module temporarily by an active assignment
In order to establish a temporary blockage of a protection module, the parameter
»ExBlo Fc« of the module
has to be set to »active«. This gives the permission: »This module can be blocked«.
Within the general protection parameters a signal has to be additionally chosen from the »
ASSIGNMENT LIST
«.
The blocking only becomes active when the assigned signal is active.
To block the tripping command of a protection stage temporarily by an active assignment.
The tripping command of any of the protection modules can be blocked from external. In this case, external does
not only mean from outside the device, but also from outside the module. Not only real external signals are
permitted to be used as blocking signals, as for example, the state of a digital input, but you can also choose any
other signal from the »assignment list«.
In order to establish a temporary blockage of a protection stage, the parameter
»ExBlo TripCmd Fc« of the
module has to be set to »active«. This gives the permission: »The tripping command of this stage can be
blocked«.
Within the general protection parameters, a signal has to be chosen additionally and assigned to the
parameter
»ExBlo« from the »assignment list«. If the selected signal is activated, the temporary blockage
becomes effective.
359 MRI4 DOK-HB-MRI4-2E