BENDER RCMA475LY B-type residual current monitor

BENDER RCMA475LY B-type residual current monitor

Core functions and hardware features

Built in measuring transformer: through-hole diameter of Φ 18mm; L1/L2/L3/N passes through the transformer, and PE protection wire is strictly prohibited from passing through the transformer window.

Two level alarm threshold

Main alarm (I2 { Delta n1} ): 30~500 mA, measurement bandwidth 0-700 Hz;

Pre alert: Choose one of two options by dialing the code, which is 50%/100% of the main alarm value.

Adjustable delay

Main alarm delay: potentiometer adjustment 0-10 seconds;

Warning delay: Select 0 seconds/1 second for dialing.

Two independent alarm relays, each with one set of switching contacts; Set NO normally open/NC normally closed for contact logic dialing;

Fault memory latch: Alarm status latch is saved and needs to be reset and cleared;

TEST/RESET composite button

Short press<1 s: RESET reset alarm;

Long press>2 seconds: TEST device self-test;

Supports external T/R terminals and external test reset buttons.

status indicator

ON green power light: always on when powered on; Over range flicker;

ALARM yellow warning light: reaching the main alarm constant light; Flashing when reaching the 50% warning threshold;

LED bar chart: displays the percentage (0-100%) of the measured residual current relative to the set value (I2 { Delta n1} ).

Analog output M+/M ---: outputs a 0-100% proportional signal (0-400 μ A), which can be connected to an external pointer measuring instrument;

Equipped with lead sealable transparent protective cover plate; Independent auxiliary power supply; Compliant with IEC 60755 Type-B standard.

Application scenarios

Used for TN and TT grounding distribution systems, 2/3/4 line AC-DC hybrid circuits:

Variable frequency speed regulation drive equipment;

UPS uninterruptible power supply, six pulse rectification, unidirectional rectification with filtering, battery charger;

Perform AC/DC mixed residual current monitoring on normal uncharged conductors (N neutral wire, PE wire).

Working principle: Built in core transformer collects circuit vector and residual current; The leakage exceeds the set threshold, and after a set delay, the relay will activate; Alarm latch, manual reset required; Real time observation of leakage percentage using a light column. This device only serves as a monitoring output dry contact and does not have a tripping power output. It requires an external contactor and PLC to achieve circuit disconnection.

Panel coding and potentiometer configuration

potentiometer

T/s: main alarm response delay, adjustable range 0-10 seconds;

I Δ n × 1/× 10: Set the main alarm current level and use range dialing to achieve 30-500 mA.

DIP dip switch

Warning trigger threshold: A=50% (I2 { Delta n1} ); B=100 % (I_{Delta n1})；

Warning delay: A=1   s; B=0   s;

Relay contact mode: A=NO normally open; B=NC normally closed;

Measurement range gear: 30 mA/50 mA gear selection.

Terminal Definition

A1/A2: Auxiliary power supply Us, it is recommended to equip the circuit with 6A fuses;

M+/M ---: Analog output of external measuring instruments;

T/R: External test reset button;

11-12-14: Main alarm relay conversion contact;

21-22-24: Pre alarm relay conversion contact.

Type-B current detection capability (IEC 60755-2)

Current type Action current range

50Hz AC 0.5~1 × (I2 { Delta n} )

Pulsating DC (positive and negative half waves, phase controlled half waves) 0.5  ~1.4 × (I2 { Delta n} )

Overlay 6mA smooth DC half wave current of 0.5~1.4 × (I2 { Delta n} )

Pure smooth DC residual current 0.5  ~2 × (I2 { Delta n} )

Key technical parameters

Relay output: 2 sets of conversion contacts; NO/NC configurable, fault memory enabled;

Contact rated voltage: AC250V/DC300V;

Connection capability AC/DC   5A;

Breaking capacity: AC230V cos φ=0.4 is 2A; DC220V L/R=0.04s is 0.2A;

The electrical lifespan is 12000 cycles.

Environment and Machinery

Working temperature -25 ℃~+70 ℃; Storage -40 ℃~+75 ℃; Climate level 3K5;

The impact and vibration meet the requirements of IEC 60068 series; EMC complies with EN   61543 and EN   61000-6-4;

Installation: DIN rail IEC 60715, can also be fixed with M4 screws; Polycarbonate shell UL94-V0;

Protection level: internal IP30; Wiring terminal IP20;

Dimensions (mm): Width 99 x Height 73 x Depth 65; Weight ≤ 350   g;

Wire cross-sectional area: Hard wire 0.2-4 mm ²; Soft wire 0.2-2.5 mm ².

Ordering model (different auxiliary power supply versions)

Model Power Supply Us Material Number Remarks

RCMA475LY AC   230   V B   9404   2002 Industrial+Civil General

RCMA475LY-13 AC 90-132 V B 9404 2004 Industrial+Civil General

RCMA475LY-21 DC 9.6-84 V B 9404 2014 for industrial applications only

RCMA475LY-23 DC 77-286 V B 9404 2015 for industrial applications only

Optional accessories for matching

9604-4241: 96 × 96mm external display meter, reading 0-100% residual current;

RK170 signal converter: Input 0-400 μ A, output 0-10 V/0/4-20 mA isolated analog signal, connected to PLC system.

Important usage points

The PE protection ground wire must not pass through the built-in transformer window, otherwise the measurement will fail; Only pass L1/L2/L3/N through the through-hole window.

Fault alarm status is locked and needs to be reset to clear; Power outage will not clear the latch alarm.

The TEST button is for local self check testing and is not equivalent to circuit leakage protection testing.

Belonging to a monitoring device, there is no power trip output, and an external contactor/PLC must be connected to cut off the circuit.

M+/M - output without electrical isolation; When connecting to the automation system, it is essential to use the RK170 isolation converter.

Execution standards

IEC 62020, IEC 60755 Amendment 2 (Type-B).