Residual current monitoring system LINETRAXX® SmartDetect RCMS410

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Overview

• 4 channels in one compact housing
• AC, pulsed DC, or AC/DC sensitive measuring for each channel
• Frequency analysis up to the 400th harmonic
• Configurable frequency response
• Communication via various interfaces

Product summary
The LINETRAXX® SmartDetect RCMS410 / RCMS425-L / RCMS425-D is a residual-current monitor (RCM) for earthed power-supply systems with sensitivity to AC, pulsed DC and smooth DC. It measures residual currents from 2 mA to 70 A (depending on CT and configuration) across a frequency range from DC and 15 Hz to 20 kHz. Matching measuring current transformers (e.g. CTUB100, CTAC series) must be connected to the residual current inputs. Individual pre-warning and main alarm response values are configurable per channel; response can be evaluated as RMS (AC/DC) or as separate AC and DC components. Alarm indication is via LEDs (RCMS410, RCMS425-L) or TFT display (RCMS425-D); signalling is also possible via digital outputs and Modbus RTU. Devices include digital I/Os and an analogue output. Parameters can be set via Modbus RTU or NFC using the Bender Connect App. Additional functions are available through software function modules.

Special features

• Four channels for AC, pulsed DC, or AC/DC sensitive measurement
• Configurable frequency response
• Harmonic analysis (FFT) and frequency analysis up to the 400th harmonic
• Expansion/retrofit or change of functions via function modules
• Simple configuration with NFC (Bender Connect App)
• Customer-specific factory settings possible

Residual current measurement

• Residual current monitoring device (RCM) according to DIN EN 62020-1 (IEC 62020-1)
• Four channels for residual current measurement (each channel can alternatively be configured as digital input)
• Type A, Type F, Type B and Type B+ characteristics selectable per IEC 60755 (VDE 0664-400)
• Measurement of AC/DC (r.m.s.) and separate AC and DC components
• Frequency range: DC, 15 Hz … 20 kHz
• Frequency analysis up to the 400th harmonic; THD calculation

Response value monitoring

• Main alarm with adjustable residual response value IΔn
• Prewarning: 10…100 % of the residual response value IΔn
• Separate evaluation of AC/DC (RMS) or AC and DC components
• Response value ranges:
  - Type A: 6 mA…30 A
  - Type F: 6 mA…30 A (15 Hz…20 kHz)
  - Type B/Type B+: 10 mA…10 A (only with function module B)
• Measurement modes per channel: overcurrent (standard), undercurrent, or window mode
• Adjustable time delays (response delay and delay on release)
• Selectable fault-memory behaviour per channel; preset and reload functions; configurable start-up delay and start state
• Continuous CT-connection monitoring

Display and operation

• NFC interface for parameter setting with the Bender Connect App
• RCMS410 and RCMS425-L: LED bargraph, device status LED, LEDs for pre-warning and main alarm, alarm LED per channel
• RCMS425-D: TFT display, device status LED, alarm LED, full text menu, 4-button navigation
• Integrated combined test/reset button and connection for external buttons
• Optional sealable transparent cover

Interfaces

• One digital input, one digital input/output, and one multifunctional digital/analogue output
• RS-485 with Modbus (Modbus RTU)
• NFC interface for device parameter setting (energised or de-energised)

Supply voltage

• Supply voltage 24 V DC (RCMS410)
• Wide range AC/DC 100…240 V and DC 24 V (RCMS425-L and RCMS425-D)

Applications

• Measuring and analysing residual currents, fault currents, and nominal currents of loads and installations
• Monitoring of residual currents of stationary installations as alternative to periodic verification
• Recognition of gradual insulation deteriorations to support preventive maintenance
• Monitoring of currents that constitute a fire hazard in exposed locations
• EMC monitoring of TN-S systems for stray currents and additional N‑PE bridges
• Monitoring of PE and protective-bonding conductors for absence of current flow
• Monitoring of N-conductors for overload caused by harmonics

Variants (type | display | IOs; relays | supply voltage | housing)
RCMS410 | LED bargraph | M+, Q, I | DC 24 V | 1 DU
RCMS425-L | LED bargraph | M+, Q, I; K1, K2 | DC 24 V; AC/DC 100...240 V | 2 DU
RCMS425-D | TFT display | M+, Q, I; K1, K2 | DC 24 V; AC/DC 100...240 V | 2 DU

Functional modules (software license)

• A: Harmonic analysis (FFT)
• B: AC/DC sensitive measuring and evaluation of values (required for Type B/B+ CT series)
• C: Connection of Type A external current transformers

Optional accessories (selection)

• Power supply units (STEP-PS series with different max. connected current transformers)
• Measuring current transformer series: CTUB100, CTBS25, CTAC series, W…-S… series, WR…S(P) series, WS series, WS…S series

Technical specifications

• Product family: LINETRAXX® SmartDetect RCMS
• Channels: 4 independent channels
• Measurement sensitivity / range: 2 mA … 70 A (depending on CT and configuration)
• Frequency response: DC, 15 Hz … 20 kHz (configurable)
• Harmonic analysis: up to the 400th harmonic (FFT); THD calculation
• Measurement modes: AC, pulsed DC, AC/DC sensitive measurement (per channel)
• Selectable characteristics: Type A, Type F, Type B, Type B+
• Interfaces: RS-485 (Modbus RTU), NFC for parameter setting, digital inputs/outputs, analogue output
• Supply voltage: RCMS410 = DC 24 V; RCMS425-L / RCMS425-D = DC 24 V or AC/DC 100…240 V
• Display: RCMS410/RCMS425-L = LED bargraph; RCMS425-D = TFT display with navigation buttons
• Housing width: RCMS410 = 1 DU; RCMS425-L / RCMS425-D = 2 DU
• Function modules available: A (FFT), B (AC/DC sensitive), C (external CT connection)
• Continuous CT-connection monitoring and configurable alarm/time delay behaviour