Residual current monitoring system LINETRAXX® RCMS460-L

continuousdigitalmulti-channel

Overview
The LINETRAXX® RCMS460-L is a residual current monitor for detecting and evaluating fault, residual and operating currents in earthed power supplies via associated measuring current transformers. Each device provides 12 measuring channels and can be networked via a BMS bus (RS-485) with up to 90 devices, enabling monitoring of up to 1080 measuring channels. CTUB100 or CTBS25 closed CTs are required for AC/DC sensitive (Type B) measurement; CTAC, WR, WS and WF series are used for AC and pulsating currents (Type A). The maximum monitored voltage depends on the insulation rating of the selected CTs. Frequency response and response ranges can be configured for personnel, fire or plant protection; measured currents can be analysed for harmonics, DC and THD.

Key features

• Selectable measurement type per channel via choice of measuring current transformer (AC / pulsed DC / AC‑DC sensitive)
• True r.m.s. value measurement
• 12 measuring channels per device (residual current measurement or digital input)
• System scalability: up to 90 devices → up to 1080 measuring channels via BMS bus (RS-485)
• Fast parallel scanning of all channels
• Example response ranges: 10 mA…10 A (0…2000 Hz); 6 mA…20 A (42…2000 Hz); 100 mA…125 A (42…2000 Hz) for RCMS…-D4
• Preset function and adjustable time delays
• Adjustable frequency response for person, fire and plant protection

Additional functions and hardware features

• History memory with date/time stamp for 300 records
• Data logger: 300 records per channel
• Analysis of harmonics, DC component and THD
• Two alarm relays with changeover contacts (device dependent; RCMS490: one alarm contact per channel)
• N/O or N/C operation and fault memory selectable
• Connection for external test/reset button
• Backlit graphical display and alarm LEDs
• Data exchange via BMS bus (RS-485 with BMS protocol)
• Password protection for device settings
• Continuous CT connection monitoring
• RoHS compliant

Applications

• Measurement and evaluation of residual, fault and rated currents in frequency ranges: 0…2000 Hz (with CTUB100 or CTBS25) and 42…2000 Hz (with CTAC, WR, WS, WF series)
• Monitoring currents regarded as fire hazards in flammable environments
• EMC monitoring of TN‑S systems for stray currents and additional N‑PE connections
• Monitoring N conductors for overloads caused by harmonics
• Monitoring PE and equipotential bonding conductors to ensure absence of current
• Residual current monitoring of stationary equipment to determine test intervals (e.g. DGUV V3)
• Personnel and fire protection by rapid disconnection
• Monitoring of digital inputs

Variants
RCMS460-L-1 | DC 16…94 V / AC 16…72 V, 42…460 Hz | B94053003
RCMS460-L-2 | DC 70…276 V / AC 70…276 V, 42…460 Hz | B94053004

Optional accessories (summary)

• Power supplies: STEP-PS/1 AC/24 DC/0.5 (for up to 4 CTUB100) — B94053110; STEP-PS/1 AC/24 DC/1.75 — B94053111; STEP-PS/1 AC/24 DC/4.2 — B94053112
• RS-485 repeater: DI-1PSM — B95012044
• Condition monitors / gateways: COM465IP (with integrated gateway) — B95061065; CP907-I / CP915-I — B95061031/32/33/34
• Alarm indicators / test combinations: MK2430 series — see documentation
• Measuring current transformers (examples): CTAC20/35/60; CTBS25; CTUB102…; WF flexible series (WF170, WF250, WF500, WF800, WF1200)

Notes
CTBS25 or CTUB100 series are required for AC/DC sensitive (Type B) measurement. WF series flexible CTs include an RCC420 signal converter. Some power supplies are not compatible with certain CT variants; consult product documentation.