Bender LINETRAXX MRCDB423 Manual - Page 7

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2.3

Standard display

The standard display shows the following:

• Residual operating current I

• Response delays t

• Residual current (present measured value)

The displayed values change periodically every 4 s.

2.4

Connection monitoring

The connections to the measuring current transformer are continuously monitored. In case of a

transformer connection fault, the output relays K1 and K2 switch, all LEDs flash. In addition, the

error code "E.01" appears on the display. Output relay K2 trips the circuit breaker, which discon-

nects the outgoing circuit to be monitored. When the connection fault has been eliminated and

the reset button "R" is pressed, the output relays K1 and K2 switch back to their initial position.

2.5

Manual self test

The device carries out a self test by pressing and holding the test button "T" (> 2 s), during which

any internal malfunctions are detected and displayed as an error code.

The output relays K1/K2 are switched so that the circuits breakers disconnects. After switching off,

the MRCDB423 carries out an offset calibration.

Due to this offset calibration, the self test must not be carried out without a circuit break-

er connected, which will shut down the installation. Otherwise, the measurement func-

tion may be faulty after the self test has been performed.

This function prevents long-term drifting.

While pressing and holding the test button "T", all device-relevant display elements are shown.

2.6

Malfunction

In the event of an internal malfunction, all three LEDs flash. The display shows an error code

(E.01...E.32). In such cases, please contact the Bender Service.

Δn2

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MRCDB423_D00396_01_M_XXEN/06.2021

LINETRAXX® MRCDB423