Troubleshooting; Safety Instructions; List Of Faults And Corrective Actions; Useful Leds On The Ieds And Switches - ABB RELION REB500 Operation Manual

1MRK 500 132-UEN B
Section 7
7.1

Safety Instructions

7.2

List of faults and corrective actions

7.2.1

Useful LEDs on the IEDs and switches

7.2.1.1

Switches

The Fault and Power (P) LED of the Switch are found on the left side of the switch. The green
link LED for optical and electrical connection is located on the electrical connector. The same
LEDs are also available on the back side of the switch.
IEC18000552 V1 EN-US
Figure 72: LED Indication on the back side of the switch
7.2.1.2

Bay Units/ Central Unit

Front side
The Ready LED is on the top of the BU/CU. The Alarm Indicator LED is located in the right lower
corner of the IED, integrated within the alarm button (see
Distributed busbar protection REB500
Operation manual

Troubleshooting

All work on the REB500 busbar protection system must be carefully planned.
Errors when manipulating the system cannot only destroy components, they
can also cause false tripping and serious interruption to the power supply.
Precautions must be taken in the immediate area when working on the central
unit or one of the bay units to exclude any possibility of persons coming into
contact with live parts.
A danger of electrical shock also exists when measuring currents and voltages.
When replacing electronic modules, take the necessary precautions to prevent
damage to components due to electrostatic discharge (ESD).
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Section 5.3.3 and Section
Section 7
Troubleshooting
5.3.6).
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