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RCMA420



LINETRAXX® RCMA420
Residual current monitor for monitoring AC, DC
and pulsed DC currents in TN and TT systems

 

 

 

 

 

 

Description:

The AC/DC sensitive residual current monitor RCMA420 is designed for monitoring earthed power supply systems (TN and TT systems) where smooth DC fault currents or residual currents continuously greater than zero may occur. These are in particular loads containing six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, construction site equipment with frequency-controlled drives. Currents in single conductors can be monitored too.

The prewarning stage (50…100 % of the set response value IΔn2) allow to distinguish between prewarning and alarm. Since the values are measured with measuring current transformers, the device is nearly independent of the load current and the nominal voltage of the system.

Application:

  • AC/DC sensitive residual current monitoring in earthed two, three or four conductor systems (TN and TT systems)

  • Monitoring of variable-speed drives, UPS systems, construction site equipment, printing machines, battery systems, laboratory equipment, wood working machines, MF welding systems, furniture industry, medical electrical equipment, etc.

  • AC/DC sensitive current monitoring of single conductors de-energised under normal conditions (e.g. N and PE conductors)

Function:
Once the supply voltage US is applied, the start-up delay is activated. Measured values changing during this time do not influence the switching state of the alarm relays.
Residual current measurement takes place via an external measuring current transformer of the W20AB…W60AB series. The currently measured value is shown on the LC display.
In this way any changes, for example when circuits are connected to the system, can be recognised easily. If the measured value exceeds the set response values, the response delays ton1/2 begin. Once the response delay ton1/2 has elapsed, the K1/K2 alarm relays switch and the alarm LEDs AL1/AL2 light up. If the current falls below the release value (response value plus hysteresis), the release delay toff. When toff has elapsed, the alarm relays return to their initial position and the alarm LEDs AL1/AL2 go out. If the fault memory is activated, the alarm relays remain in the alarm state and the LEDs light until the reset button is pressed or until the supply voltage is interrupted. The device function can be tested using the test button. Parameters are assigned to the device via the LCD and the control buttons on the front panel; this function can be password-protected.

Features:

  • AC/DC sensitive residual current monitor Type B acc. to IEC 62020 and IEC/TR 60755

  • r.m.s. value measurement (AC+DC)

  • Two separately adjustable response values 10…500 mA

  • Frequency range 0…2000 Hz

  • Start-up delay, response delay and delay on release

  • Digital measured value display via LC display

  • Measured value memory for operating value

  • CT connection monitoring

  • LEDs: Power On, Alarm 1, Alarm 2

  • Internal/external test/reset button

  • Two separate alarm relays (one changeover contact each)

  • N/O or N/C operation and fault memory behaviour selectable

  • Continuous self monitoring

  • Multi-functional LC display

  • Password protection for device settings

  • Sealable transparent cover

  • Two-module enclosure (36 mm)

  • RoHS compliant

  • Push-wire terminal (two terminals per connection)

Connection monitoring:
The function of the device and the CT connections are continuously monitored. In the event of a fault, the alarm relays K1/K2 switch without delay, the alarm LEDs AL1/AL2/ON flash.
On removal of the fault, the alarm relays return to their initial position either automatically or by pressing the reset button.

                                       

                                           Wiring diagram:

                                          Dimentions

                                         Technical data

                                          

 

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