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52
RCU operation
The RCU has been designed with the
intention that limited operator interaction is
required with the RCU once installed and
configured. The primary reason for
interaction is to:
Check the RCU panel LEDs for problems,
refer to RCU maintenance on page 56.
Disable remote control of the Fusesavers
from the SCADA operator. This would
normally occur to allow line crews to
work downstream of the Fusesavers,
refer below.
Operate the Fusesaver with an operator
control panel installed on the RCU, refer
page 20.
Observe the LED light status on the
display to assist in SCADA
communications debugging.
Conduct maintenance on the RCU, such
as changing batteries, as described on
page 57.
Open the door to allow RCU Connect to
open communications with the RCU,
refer page 15.
Load newer versions for RCU firmware as
described on page 5.
Remote control
To disable remote SCADA control of the
Fusesavers the following process is
followed:
1. Open the enclosure door.
2. Change the "Remote Control" toggle
switch position from "I" to "O".
3. Check that the red LED light next to the
"Remote Control ON" text on the display
has turned off.
4. Check that the green LED next to the
"Remote Control OFF" text on the display
has turned on.
5. Close the RCU enclosure door and lock.
The same process is applied to restore the
Fusesavers to remote SCADA control, except
the "Remote Control" toggle switch is set to
"I".
It is possible to permit Fusesaver trip
controls from a SCADA system even though
the remote control on switch is in the OFF
position, refer to Configuration parameters
on page 23.
Fusesaver operator control panel
If a Fusesaver operator control panel is fitted
in the RCU, then the local user has a much
greater range of local interaction with the
RCU. The local user will be able to trip and
close Fusesavers or to change their
protection mode.
After pressing the operator panel "ON" button,
ensure the LED for this button lights up. If the LED
does not light up, then there is a problem with the
panel and the user should contact Siemens
customer service. In this case, the user should not
press any other buttons on the operator panel as
the user cannot confirm whether the control has
been issued or the status of the Fusesavers.
After opening the RCU door the local
operator must press the "Panel ON" button
on the panel to make it active. The LED
lights will come on showing the status of
each Fusesaver on the line above.
If the panel is plugged in after the RCU has
been powered up, please allow up to 30 s
for the RCU to detect the panel.
When the RCU has completed searching for
and has verified the Fusesavers it is
connected to, the OK green LED will be lit.
This normally takes around five minutes.
When this stage is complete, the FS control
panel should have valid data for each of the
phases to which the RCU is connected.
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