Table of Contents
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1. Making effective use of this documentation
1.1 How to use this manual
This manual is intended for qualified personnel working in electrical engineering and
electronics!
To make it easier for you to understand and revisit certain sections in this manual, we have used symbols to
identify important instructions and information. The meaning of these symbols is explained below:
This signal word indicates that there is a high risk of danger that will result in death or
serious injury if not avoided.
DANGER
This signal word indicates a medium risk of danger that can lead to death or serious injury,
if not avoided.
WARNING
This signal word indicates a low-level risk that can result in minor or moderate injury or
damage to property if not avoided.
CAUTION
This symbol denotes information intended to assist the user in making optimum use of the
product.
1.2 Intended use
The AC/DC sensitive MRCDB423 with the corresponding CTUB101-CTBC... measuring current transformers
are used as additional protection (protection against indirect contact) in earthed systems (TN and TT systems)
in which AC or DC fault currents may occur. Part of these systems are particularly loads containing six-pulse
rectifiers or one-way rectifiers with smoothing, such as converters, battery chargers, construction site equip-
ment with frequency-controlled drives.
MRCDB423_D00396_00_M_XXEN/06.2020
MRCDB423_D00396_00_M_XXEN/06.2020
1
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Summary of Contents for Bender MRCDB423 Series
- Page 1 1. Making effective use of this documentation 1.1 How to use this manual This manual is intended for qualified personnel working in electrical engineering and electronics! To make it easier for you to understand and revisit certain sections in this manual, we have used symbols to identify important instructions and information.
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Page 2: Safety Instructions
Since the values are measured with measuring current transformers, the MRCDB423 is almost independent of the nominal voltage and the operating current of the monitored system. The residual operating current I , the response delay t as well as the currently measured residual current Δn2 are shown on the standard display. -
Page 3: Manual Self Test
While pressing and holding the test button "T", all device-relevant display elements are shown. 3.6 Malfunction In the event of an internal malfunction, all three LEDs flash. The display shows an error code (E.01…E.32). In such cases, please contact the Bender Service. 3.7 Time delays and The times t and t described below delay the signalling of prewarning and main alarm via LEDs and the out- put relays. -
Page 4: Device Parameter Settings
3.8 External, combined test or reset button T/R Reset= pressing the external button briefly (< 1 s) Test= pressing and holding the external button (> 2 s) The device function can be tested using the test button "T". 3.9 Device parameter settings The device parameters are set via the control buttons on the front. -
Page 5: Terminal Connections
4.2 Wiring Connect the device according to the wiring diagram. F 6A > U S1(k) S2(l) +12V -12V T CTBCx CTUB101 MRCDB423 CTX... Terminal Connections Connection to supply voltage U A1, A2 Socket for connection cable of measuring current transformer Connection for a combined external test and reset button 11, 12, 14 Output relay K1 (alarm) - Page 6 5.2 Function of the operating elements Device front Element Function lights continuously: Power On LED, green flashes: system fault or malfunction of connection monitoring Alarm LED lights (yellow): Prewarning Δn1 TRIP TRIP LED lights (yellow): Main alarm Δ TRIP 13 mA 13 mA flow through the measuring current transformer, Fault memory active Standard display: (>...
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Page 7: Parameter Settings
Overview of the menu structure: . . . Test P I N Reset Fig. 1: Menu structure (schematically) Press and hold the MENU button (> 2 s) to go back one menu level. 5.4 Parameter settings Example with AL menu (alarm) In principle, a distinction is made in the time during which the MENU/Enter button is pressed: briefly : <... - Page 8 Increasing response value I1 (prewarning) an value I2 (overcurrent alarm) 5.5 Explanatory notes on the setting parameters 5.5.1 t menu (set delay times) The following delays can be set: • Response delay t (0…10 s) for K1 • Response delay t (0…10 s) for K2 5.5.2 SEt menu Password protection (on, OFF)
- Page 9 6. Setting ranges, factory settings, LEDs 6.1 Setting parameters Factory Menu Parameter Description Setting range setting I2 > Response value I2; "Greater than" comparison 30 mA…1.0 A 30 mA I1 > Response value I1; "Greater than" comparison 50…100 % 50 % ton 1 Response delay output relay 1 0…10 s...
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Page 10: Dimension Diagrams
7.2 Wiring diagram measuring current transformers 50 mm CTX-… 2,5 m CTBCx 10 m CTUB101 250 mm S1(k) S2(l) +12V -12V T MRCDB423 Fig. 3: Wiring diagram measuring current transformers The measuring range must be set according to the response values in the evaluator. 7.3 Dimension diagrams Type CTUB…-CTBC20(P) - Page 11 7.4 Mountings CTBC120(P) CTBC20(P) CTBC60(P) CTBC210(P) CTBC35(P) Type CTBC20(P) 20 mm 49,8 ø CTBC35(P) 35 mm 49,8 ø CTBC60(P) 60 mm ø CTBC120(P) 120 mm ø CTBC210(P) 210 mm ø 7.5 Installation instructions measuring current transformer Do not route any shielded cables through the measuring current trans- former.
- Page 12 7.6 Shielded measuring current transformer variants When used in outgoing circuits with high load or inrush currents, local saturations of the magnetic core mate- rial of the measuring current transformers can occur. It is therefore recommended to use the shielded P ver- sions to avoid false tripping.
- Page 13 Operating uncertainty......................................0…35 % Response values Rated residual operating current ........................... 50…100 % of (50 %)* Δn1 Δn2 Rated residual operating current ............................30 mA…3 A (30 mA)* Δn2 Time response Start-up delay ........................................... (1 s)* Response delay ....................................... 0…10 s (1 s)* Response delay .......................................
- Page 14 Other Operating mode ....................................continuous operation Position of normal use....................................display-oriented Degree of protection, internal components (IEC 60529) .............................. IP30 Degree of protection, terminals (IEC 60529) ................................. IP20 Enclosure material ......................................polycarbonate Flammability class ........................................UL94V-0 DIN rail mounting acc. to......................................IEC 60715 Screw fixing ....................................
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Page 15: Standards, Approvals And Certifications
Connecting cables are optionally available. Use 60/75 °C copper lines only. Other Degree of protection, internal components (IEC 60529) .............................. IP40 Degree of protection, terminals (IEC 60529) ................................. IP20 Screw mounting ................................M5 lens-head screw acc. to DIN 7985 Flammability class ........................................UL94 V-O Weight CTUB10x- CTBC20 ...................................... -
Page 16: Error Code Meaning
Action: Perform a reset. Restore the factory settings of the device. E… The error code will be deleted automatically once the error has been eliminated. Should the error persist, please contact the Bender Service. Alle Rechte vorbehalten. Nachdruck und Vervielfältigung nur mit All rights reserved. Reprinting and duplicating only with Genehmigung des Herausgebers.
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