Earth-fault detector LINETRAXX® RCMS460-D

Overview
The LINETRAXX® RCMS460-D is a residual current monitoring device designed to detect and evaluate fault, residual and operating currents in earthed power supplies. Each unit provides 12 measuring channels that accept a range of closed, split-core or flexible measuring current transformers. Multiple devices can be networked via BMS bus (RS-485) to monitor large installations.

Key features

• Selectable AC, pulsating DC or AC/DC (type A or B) sensitivity by choosing the appropriate measuring current transformer per channel
• True r.m.s. measurement
• 12 measuring channels per device (residual current measurement or digital input)
• Scalable system: up to 90 RCMS devices → up to 1080 measuring channels via BMS bus
• Fast parallel scanning of all channels; adjustable response ranges and time delays
• Frequency response configurable for personnel, fire and plant protection

Additional features

• History memory with date/time stamp (300 records) and data logger (300 records per channel)
• Harmonic, DC and THD analysis
• Alarm outputs: two relays with changeover contacts (device dependent); RCMS490 variant: one alarm contact per channel
• N/O or N/C operation and fault memory selectable; external test/reset input
• Backlit graphical display and alarm LEDs; password protection for settings
• Continuous CT connection monitoring; data exchange via BMS bus (RS-485); RoHS compliant

Applications

• Measurement and evaluation of residual, fault and operating currents across 0…2000 Hz or 42…2000 Hz depending on CT type
• Monitoring currents that present a fire hazard in flammable atmospheres
• EMC monitoring of TN-S systems to detect stray currents and unwanted N–PE bridges
• Monitoring N conductors for harmonic-related overloads and checking PE/equipotential conductors for absence of current
• Residual current monitoring for fixed electrical equipment to define test intervals (e.g., DGUV V3)
• Personnel and fire protection by fast disconnection when configured accordingly; monitoring of digital inputs

Variants (selection)
RCMS460-D-1 | DC 16…94 V / AC 16…72 V, 42…460 Hz | B94053001
RCMS460-D4-1 | DC 16…94 V / AC 16…72 V, 42…460 Hz | B94053009
RCMS460-D-2 | DC 70…276 V / AC 70…276 V, 42…460 Hz | B94053002
RCMS460-D4-2 | DC 70…276 V / AC 70…276 V, 42…460 Hz | B94053010

Optional accessories (selection)

• STEP-PS/1 AC/24 DC power supplies (various outputs for CTUB100 count) | B94053110…B94053112
• DI-1PSM RS-485 repeater | B95012044
• COM465IP gateway / Condition Monitor and function packages for integration (Modbus TCP, visualization, virtual devices) | B95061065 / B75061xxx
• CP907-I / CP915-I Condition Monitors for TCP/IP integration | B95061031…B95061034

Measuring current transformers (examples)

• AC/pulsating-sensitive: CTAC20 (ø20) B98110005, CTAC35 (ø35) B98110007, WR70x175S B11738, WS20x30 split-core B98080601
• AC/DC sensitive (Type B): CTUB102/CTBC20 (ø20) B78120011, CTBS25 (ø25) B98120060
• Flexible WF series: WF170-1 (ø170) B78080201, WF1200-2 (ø1200) B78080210

Downloads

• RCMS460/RCMS490 Manual (PDF)
• RCMS460/RCMS490 Datasheet (PDF)
• RCMS460 - 490 CE / UKCA Declarations (PDF)
• CTUB100 wiring addendum (Technical info)

Technical specifications (summary)

• Measuring channels per device: 12
• Max. devices on BMS bus: up to 90 → up to 1080 measuring channels
• Response ranges (examples): 10 mA…10 A (0…2000 Hz); 6 mA…20 A (42…2000 Hz); 100 mA…125 A (42…2000 Hz) for RCMS…-D4
• True r.m.s. measurement; harmonic/DC/THD analysis
• History memory and data logger: 300 records / 300 records per channel
• Alarm outputs, display, adjustable frequency response and time delays; password protection
• Continuous CT connection monitoring; communication via BMS bus (RS-485)