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ABB Automation Products AB
Version: Initial version
Issue date: May 2000
The
The
RXHL 422 Compact current relay
WARNING AND NOTE SIGNS
The warning sign
The warning sign informs the user that certain operations should be avoided in
order to prevent human injuries or damage to equipment.
The note sign
The note sign informs the user to be careful when using the product in certain sit-
uations and notifies the user to facts that could be of special interest during cer-
tain operations.
Warning!
Always avoid to touch the circuitry when the plastic cover, which covers the relay,
is removed. The product contains electronic circuitries which can be damaged if
exposed to static electricity (ESD). The electronic circuitries also contain high
voltage which is lethal to humans.
Warning!
Never plug or withdraw a relay from the terminal base without blocking the output
circuits or interrupting the auxiliary DC supply. Otherwise there is a risk of un-
wanted operations.
Warning!
Never disconnect a wire in a current circuit. Always be sure to short-circuit the
secondary phase terminals of the current transformers to neutral before the circuit
is opened. An opened current circuit will produce an extremely high voltage which
is lethal to humans.
Note!
If the LED's are flashing or the green 'In service' LED is dark, an internal fault
has occurred. Read the self supervision section in the technical reference manual
for further information.
Note!
The compact current relay is designed for a maximum continuous current of four
times rated value.
Note!
When the excitation characteristic is verified, the primary side of the CT must be
an open-circuit and the secondary side disconnected from the relay protection.
Note!
The length of the EMC-cable must be as short as possible when connecting to
EMC-earth. Withstand against electrical disturbances could otherwise be hazard-
ed.
Note!
The calculated phase angle ϕ between U
1MRK 509 057-WEN
and I
is positive when I lags U.
N
N
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