8 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 maintenance on page 82.
Disable remote control of the switchgear from the SCADA operator. This would normally occur
to allow line crews to work downstream of the switchgear, refer below.
Operate the switchgear with an operator control panel installed on the RCU, refer page 30.
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 84.
Open the door to allow RCU Connect to open communications with the RCU, refer page 24.
Load newer versions for RCU firmware as described on page 87.
8.1 Remote Control
To disable remote SCADA control of the switchgear 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 switchgear to remote SCADA control, except the “Remote
Control” toggle switch is set to “I”.
It is possible to permit switchgear trip controls from a SCADA system even though the Remote
Control On switch is in the OFF position, refer configuration parameters on page 98.
8.2 Fusesaver Operator Control Panel
Refer to [4] for details of CMR Operator Panel operation. 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 the
Siemens service centre. 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.
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