4.1.4 Siemens Connect Control
If a local operator is using the Siemens Connect PC application to operate the line Fusesavers (this
is called being in-session) then the RCU will not send controls to the Fusesavers and will not retrieve
events from the Fusesavers. This is because Siemens Connect is considered to be a local operator
and takes charge of communications to the Fusesavers. Any controls received from the SCADA
system or from a Fusesaver Control Panel fitted to the RCU will be rejected.
Once the Siemens Connect session is complete, all new events in the Fusesaver will be passed to
the RCU for relay through the SCADA system.
Whilst Siemens Connect is in-session with the Fusesavers a digital point indicating that the
Fusesavers are not in-session with the RCU is available for transmission to the SCADA system.
4.1.5 Fusesaver Protection Mode Control
One of the core functions of the RCU is to allow remote control of the Fusesaver protection
functionality. The Fusesaver has up to nine possible protection modes (depending on its
configuration) as defined in the Fusesaver Operating Instructions as follows:
1 Protection Off Mode: the Fusesaver will not TRIP when a fault occurs, protection
functionality is disabled.
2 Normal-Off Mode: the Fusesaver utilises the “normal” protection curve defined by the
policy file and fuse settings at time of configuration. The Fusesaver will automatically
CLOSE after the dead time.
3 Normal-Single Mode: the Fusesaver utilises the “normal” protection curve defined by the
policy file and fuse settings at time of configuration. The Fusesaver will NOT
automatically CLOSE after the dead time, i.e. it will TRIP and stay in the OPEN state.
4 Normal-Normal Mode: the Fusesaver utilises the “normal” protection curve defined by
the policy file and fuse settings at time of configuration. The Fusesaver will automatically
CLOSE after the dead time and will then activate the “normal” protection curve allowing
a second TRIP if necessary.
5 Normal-Fast Mode: the Fusesaver utilises the “normal” protection curve defined by the
policy file and fuse settings at time of configuration. The Fusesaver will automatically
CLOSE after the dead time and will then activate the “fast” protection curve allowing a
second TRIP if necessary.
6 Fast-Off Mode: the Fusesaver utilises the “fast” protection curve defined by the policy file
and fuse settings at time of configuration. The Fusesaver will automatically CLOSE after
the dead time.
7 Fast-Single Mode: the Fusesaver utilises the “fast” protection curve defined by the policy
file and fuse settings at time of configuration. The Fusesaver will NOT automatically
CLOSE after the dead time, i.e. it will TRIP and stay in the OPEN state.
8 Fast-Normal Mode: the Fusesaver utilises the “fast” protection curve defined by the policy
file and fuse settings at time of configuration. The Fusesaver will automatically CLOSE
after the dead time and will then activate the “normal” protection curve allowing a second
TRIP if necessary.
9 Fast-Fast Mode: the Fusesaver utilises the “fast” protection curve defined by the policy
file and fuse settings at time of configuration. The Fusesaver will automatically CLOSE
after the dead time and will then activate the “fast” protection curve allowing a second
TRIP if necessary.
The Fusesaver can be put into any of these modes from the following inputs:
1 The external lever of the Fusesaver. When the lever is pulled down the protection mode
is forced to the mode defined in Fusesaver policy file. This always overrides the current
mode setting in force. Important - when the external lever is returned to the UP position
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