Magtron Residual Current Monitoring Unit(RCMU ) Update: 2017.03.22. V1.0.3 Features +5V Supply Voltage Self-check function Positive output for ADC Printed circuit board mounting Characteristics Stable accuracy self stimulation Low hysteresis offset voltage Short response time Integration frequency filter Compact design Applications Appliance ground fault detection Solar inverter residual current Converter leakage current detection UPS and other power ground fault detection Electric vehicle charge station Single or 3 Phases differential current detection Select Part List Part Number IPN(mA) IPM(mA) IM(A) ±300 ±500 ±80 Standards EN50178 IEC60950-1 UL1741 VDE0126-1-1 GBT1726.5 / IEC61000-4-5 / UL1449 Overview An important safety function of these devices is the monitoring of the leakage current of the entire system from Power modules or inverter against earth. A defective system can become dangerous for people or release fires. Before it comes so far, the inverter must disconnect from the grid. The leakage current contains DC and AC components. Therefore an AC/DC-sensitive monitoring unit is necessary. Their heart is the Magtron RCMU differential current sensor, whose output voltage is evaluated by the control system of the Power inverter. Generally protection devices with AC/DC-sensitive differential current sensors can be used everywhere, where flat or pulsating DC can develop, whose amount is permanently greater than zero. Instruction installation in a Pollution Degree 2 environment (or equivalent statement). Suitable wiring diagram for indicate the connection.
Application circuit Functional block diagram Application circuit Note: C1 should be close to the current sensor s pin Component selection reference: Designator Description C1 TDK,X5R,10uF/16V,±10%,0603 Pin Definition No. Symbol Description 1 VO Signal output 2 CHK Product Self-Check input 3 GND Power GND 4 VCC Power supply 5 REF Reference voltage output 6~13 IP Primary Pin Current direction Assembly Pin Relationship between IP and output voltage
Absolute Maximum Ratings Parameter Symbol Min Typ Max Unit Supply Voltage(not operating) VC 5.5 V Ambient operating temperature TA -40 85 Ambient storage temperature TA -45 105 High Voltage Characteristics Parameter Symbol Value Unit Rms voltage for AC insulation test, 50 Hz, 1 min Ud 4.5 kv Impulse withstand voltage 1.2/50μs Uw 7 kv System working voltage (RMS) Vs <750 V Comparative Tracking Index (group I) CTI 600 V Clearance (See drawing in page 6) DCI TBD mm Creepage distance (See drawing in page 6) DCP TBD mm Other Characteristics Parameter Symbol Max Unit Wave soldering profile TWSP 260 Electrical data At Ta=25,Vc=5V, unless otherwise noted Parameter Symbol Min Typ Max Unit Comment Power Supply voltage Vc 4.9 5 5.1 V 2% Cureent consumption Ic 25 ma Primary differential cureent IPN ±300 ma Measurement range IPM ±500 ma Output static state voltage VOS 2.5 V @ IP=0A Output voltage VON(+) 3.7 V @ + IPN Output voltage VOM(+) 4.5 V @ + IPM Output voltage VON(-) 1.3 V @ - IPN Output voltage VOM(-) 0.5 V @ - IPM Output voltage Gain VG 0.4 V @100mA Electrical offset voltage VOE <25 mv Accuracy X 2 % @ IPN /25 Full temperature Accuracy XFT 4 % @ IPN/-40~85 Linearity error εl 1 % @ IPN Bandwidth BW 700 Hz @-3dB Check current ICK 50 ma 10% Output voltage (Check function) V(CK) VOS+0.2 V Check enable voltage VCE 3.3 Vc V Check disabled voltage VCD <0.2 V Reference Voltage VREF 2.475 2.5 2.525 V 1% Fault over current recovery limit IM 80 A
Application information Self-check Function Set the CHK pin to high status. Detector will running in self-test mode,check the OUT,equivalent to the status Ip is Ick, at this time the output has equivalent voltage, the detector is ok.then set CHK to low status.the detector starts t o monitor the residual current. Photovoltaic Inverter Residual Current For no separation of power grid and the photovoltaic power generation between the inverter,according to VDE0126-1-1,there must be RCMU (residual current monitoring unit). From VDE0126-1-1,Inverters without a basic insulation (e.g. basic insulated transformer) between the grid and the photovoltaic-generator must have a fault current monitoring unit (RCMU)installed. The d.c. and a.c. component of the fault current depend on the construction of the inverter and on the d.c. voltage of the PV-generator.
PCB Footprint PCB Holes Secondary pins: ø1.1x2.2 Primary Pins: ø5.0x8.0 Top view Safety This transducer must be used in limited-energy secondary circuits according to IEC 61010-1. This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements inaccordance with the manufacturer s operating instructions. Caution, risk of electrical shock When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply). Ignoring this warning can lead to injury and/or cause serious damage. This transducer is a build-in device, whose conducting parts must be inaccessible after installation. A protective housing or additional shield could be used. Main supply must be able to be disconnected.
Dimensions Mechanical Characteristics ( Unit : mm, Tolerance in ±0.2)