Service and Commissioning Support
Disarming the Relay Output Contacts
The parameters, their defaults, and setting ranges have to be taken from
the Relay Output Contacts section.
Principle – General Use
Within this mode [Service/Test Mode/DISARMED], entire groups of relay output contacts can be disabled.
By
means of this test mode, contact outputs switching actions of the relay output contacts are prevented.
If the relay
output contacts are disarmed, maintenance actions can be carried out without the risk of taking entire processes off-
line.
The User MUST ENSURE that the relay output contacts are ARMED AGAIN
after the maintenance is complete.
If they are not armed, the protective
device WILL NOT provide protection.
Zone Interlocking Output and the Supervision Contact cannot be disarmed.
Within this mode [Service/Test Mode/DISARMED] entire groups of relay output contacts can be disarmed:
Permanent; or
Via timeout.
If they are set with a timeout, they will only keep their “Disarm Position” as long as this timer runs. If the timer
expires, the relay output contacts will operate normally.
If they are set Permanent, they will keep the “Disarm State”
continuously.
A relay output contact will NOT be disarmed as long as:
It´s latched (and not yet reset).
As long as a running t-OFF-delay timer is not yet expired (hold time of a
relay output contact).
The Disarm Control is not set to active.
The Direct Command is not applied.
A relay output contact will be disarmed if it´s not latched and
There is no running t-OFF-delay timer (hold time of a relay output
contact) and
The DISARM Control is set to active and
The Direct Command Disarm is applied.
558
MRU4
DOK-HB-MRU4-2E
