Omicron CMC 156 Reference Manual
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Omicron CMC 156 Reference Manual

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CMC 156

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Haochi Tang
March 27, 2025

Why the overload current light is red when we switch it on

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1 comments:
Mr. Anderson
March 27, 2025

The overload current light on the Omicron CMC 156 turns red when an overload occurs at one of the current or voltage outputs. This triggers a corresponding display in the CMC software, indicating the overload condition. Additionally, if the device switches off due to overtemperature caused by a low ohmic burden with a high ON period, messages such as "Overtemperature at voltage output!" or "Overtemperature at current output!" appear, and all voltage (V) and current (I) outputs are switched off.

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Sushil Hibare
February 6, 2025

Hi We want to purchase VEHZ2007 Cable Qty 1 nos

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Summary of Contents for Omicron CMC 156

  • Page 1 Reference Manual CMC 156...
  • Page 2 The user is responsible for every application that makes use of an OMICRON product. OMICRON electronics translates this manual from the source language English into a number of other languages. Any translation of this manual is done for local requirements, and in the event of a dispute...

  • Page 3: Safety Instructions

    ATTENTION: Before starting up the CMC 156, carefully read the following safety instructions. The system must not be put into operation without full knowledge of this information! The CMC 156 may only be operated by trained personnel on the company premises!
  • Page 4 • External devices may only be connected to the SELV interfaces of the CMC 156 (host-interface, Gen. out 7-12, ext. Interface) if they comply to the SELV requirements according to EN60950. Do not open the CMC 156 or remove any of its housing components Voltages of up to 400 V will occur inside the unit! If the unit is opened, warranty claims will become void.

  • Page 5: Table Of Contents

    Table of Contents Table of Contents Safety Instructions ....................3 Table of Contents ..................... 5 Introduction ....................... 7 Start-Up ......................9 System components ......................9 System Start ......................... 9 Design and Operation ..................11 Modules ..........................12 3.1.1 Host Interface .......................13 3.1.2 Processor ......................13 3.1.3...
  • Page 6 Test Set CMC 156 Inputs ..........................39 5.3.1 Binary Inputs ......................39 5.3.2 Counter Inputs 100 kHz ..................41 5.3.3 Measuring Inputs ....................42 Computer Interface ......................43 Ambient Conditions ......................43 5.5.1 Climate ......................... 43 5.5.2 Shock and Vibration .................... 44 5.5.3...

  • Page 7: Introduction

    Introduction 1 Introduction The CMC 156 test system consists of the components CMC 156 test set, a computer and the CMC user software. External amplifiers and optional devices can also be controlled optionally. Due to its wide range of optional settings, the CMC 156 test set completely eliminates the need for operating elements on the front panel - every function is controlled by the software on the COMPUTER.
  • Page 8 Test Set CMC 156...

  • Page 9: Start-Up

    Figure 1 Connection CMC 156 and computer These instructions refer to a system including a computer and basic device CMC 156, i.e. without additional amplifiers. If the system is to be operated with external amplifiers, please refer to the instructions in your CMC SW user's manual, section "Configuring an external amplifier".
  • Page 10 CMUSB-P converter (ordering number VEHZ2007) instead of the VEHK0002 to connect the CMC 156 to the computer. 2. Connect the CMC 156 and the computer to the power supply. (Power supply cable is supplied.) 3. Power both units up. CMC 156: ON/OFF switch on the front panel.

  • Page 11: Design And Operation

    Our computer-controlled design concept allows the following segregation of functions: Computer • Application software • Control and display • Measuring data processing • Reporting and archiving CMC 156 test set • Signal generation • Voltage and current amplifier • Input signal measurement • Time-critical processes...

  • Page 12: Modules

    Test Set CMC 156 Modules Figure 2 Basic block diagram of the CMC 156...

  • Page 13: Host Interface

    If the computer is equipped with a parallel printer port, too, use the 25-pole cable (VEHK0002) that was supplied with the test set to connect the CMC 156 to the computer. If the computer is equipped with a USB port, use an OMICRON CMUSB-P converter (ordering number VEHZ2007) instead of the VEHK0002 to connect the CMC 156 to the computer.

  • Page 14: Measuring Module

    Test Set CMC 156 3.1.4 Measuring Module The measuring module for analog signals primarily consists of a laser trimmed high-precision voltage reference, a 16-bit A/D converter with series-connected multiplexer and the appropriate input circuits (precision voltage divider, filter). The input signals V and I , the output voltages, amplifier temperatures, etc.

  • Page 15: Internal Current And Voltage Amplifiers

    Design and Operation 3.1.5 Internal Current and Voltage Amplifiers The output amplifiers are designed as linear amplifiers and direct voltage coupling with MOSFET output stages. Using this technology, excellent harmonic distortion and frequency response specifications can be realized in a very compact design. The direct voltage coupling allows accurate representation of any transient function.

  • Page 16: Power Supply

    For more information, please refer to the CMC software manual, chapter ‘System configuration’. 3.1.6 Power Supply The following power supplies are used in the CMC 156: a. The mains-sided power supply with power factor correction creates an intermediate circuit voltage for the supply of the connected isolated power supplies.

  • Page 17: Signal Generation

    The requirement for 6 fixed-phase coupled signals suggests a digital implementation. In the CMC 156 the quality of the signals is achieved due to the use of a modern and powerful signal processor. The implemented algorithm linearly interpolates between the basic values of...
  • Page 18 Figure 3 Block diagram of the generator outputs of the CMC 156 The CMC 156 test system supplies four generator triples of three signals each. The generator triples 1 and 2 are output via the internal amplifiers to the outputs of the front panel.

  • Page 19: Accuracy

    Design and Operation Accuracy The data sheet values for the CMC 156 are not typical values but guaranteed values over one year from the time of factory calibration at 23 °C ± 5 % (73 °F ± 10 °F). Some factors had to be taken into account during development in order to achieve the desired accuracy.

  • Page 20: Connectors And Interfaces

    Test Set CMC 156 4 Connectors and Interfaces Connectors on the Front Panel BINARY OUTPUT Combination jack for BINARY INPUT 4 internal floating binary outputs ANALOG INPUT routed out individually. 20-pole combination jack for the following connections: - current measuring input...
  • Page 21 Connectors and Interfaces Figure 6 Outputs and inputs of the front panel...

  • Page 22: Generator Combination Socket For Voltage Output, Current Output

    VOLTAGE OUTPUT, CURRENT OUTPUT The combination socket CURRENT OUTPUT / VOLTAGE OUTPUT serves for easy connection of the test object to the CMC 156. All signals of the connection sections CURRENT OUTPUT and VOLTAGE OUTPUT are brought out at this connector.
  • Page 23 Felix -Wankel-Str. 1, 85221 Dachau, Tel.: +49 (0)8131 2808-0 or NCV GmbH, Erzbischof Buchberger Allee 14, 93051 Regensburg, Tel.: +49 (0)941 98041, FAX: +49 (0)941 999772 Table 3 Suppliers  If you want to order from OMICRON, refer to section 7.2 "Ordering Notes “.

  • Page 24: Measurement Combination Socket For Binary Input And Analog Input

    BINARY INPUT and ANALOG INPUT The combination socket BINARY INPUT / ANALOG INPUT serves for easy connection of the test object to the CMC 156. All signals of the connection sections BINARY INPUT and ANALOG INPUT are brought out at this connector.
  • Page 25 Binary input 1 gy/bn Binary input 4 GND_A wh/pk Analog GND UDC_IN pk/bn DC voltage input The shield is not connected within the CMC 156 and has therefore to be connected within the signal source. Table 4 Assignment Measurement Combination Socket...
  • Page 26 Tel.: +1 (0)707 5788811, Fax: +1 (0)7075780869 LEMOSA GmbH , Stahlgruberring 7, 81829 München 82 Tel. +49 (0)89 423085, Fax +49 (0)89 427192 Table 6 Manufacturer / Supplier  If you want to order from OMICRON, refer to section 7.2, "Ordering Notes “.

  • Page 27: Connections On The Back Panel

    For connection to this socket use the cable which is included in the scope of delivery of the external amplifier (connection cable CMC 156 - amplifier). The outputs are isolated from mains and the power outputs by reinforced isolation (SELV interface) and supply calibrated signals in the range 0 to 5V (7.07V...
  • Page 28 Test Set CMC 156 Figure 10 Plug for Interface "Gen. out 7-12" (lower 16-pole Lemo jack); (view onto cable connection side) Function Pin 1 Gen. Out 7 Pin 2 Gen. Out 8 Pin 3 Gen. Out 9 Pin 4 GND_A (electrically connected to ground) Pin 5 Gen.

  • Page 29: Ext. Interface

    Connectors and Interfaces 4.2.2 ext. Interface On the connection socket ‘ext. Interf.’ two counter inputs are supplied for meter testing with input frequencies of up to 100kHz. In addition, there are four additional transistor binary outputs 11-14. Compared to the relay binary outputs these have the advantage that they do not bounce and that only minimal response times occur.
  • Page 30 Plug with 2 guide cams and pull relief For ext. Interface: FGG.2B.316.CLAD 72Z Plug with 1 guide cam and pull relief Bend protection spout black GMA.2B.070 DN Table 9 Manufacturer designation  If you want to order from OMICRON, refer to section 7.2"Ordering Notes “.

  • Page 31: Technical Data

    Technical Data 5 Technical Data The following data refer to a CMC 156 test set with standard design, without external amplifiers.  For test sets with the EP option (Extended Precision), technical data regarding the power amplifiers are different from the corresponding data of standard devices: therefore, these data can be found separately in chapter 6, "Technical Data EP Option".

  • Page 32: Outputs

    Test Set CMC 156 Outputs The data given in the following table are valid for all generator outputs, regardless of the amplifiers used (internal or external ones); the following tables are valid only for equipment with internal amplifiers.  For the block diagram of the generator outputs available please refer to Figure 3 on page 18.

  • Page 33: Current Outputs Current Output 1-3

    Technical Data 5.2.1 Current Outputs CURRENT OUTPUT 1-3 3 current outputs for standard design Output currents 3 × 0 to 12.5 A 3-phase AC (L-N) 1 × 0 to 12.5 A 1-phase AC (L-N) 1 × 0 to 21 A in parallel 1-phase DC (L-N) 1 ×...
  • Page 34 Test Set CMC 156 Ptyp in [VA] Pgar in [VA] 9 10 10 11 11 12 12 13 I in A Figure 12 Typical (Ptyp.) and guaranteed (Pguar.) output power of the internal current amplifiers with standard design For a parallel connection of two current outputs a maximum output power of Pout >...

  • Page 35: Voltage Outputs Voltage Output 1-3

    Technical Data 5.2.2 Voltage Outputs VOLTAGE OUTPUT 1-3 3 voltage outputs for standard design Output voltages 3 × 0 to 125 V 3-phase AC (L-N) 1 × 0 to 250 V 1-phase AC (L-L) 3-phase DC (L-N) 3 × 0 to ±125 V Resolution 6 mV Power...

  • Page 36: Interface For An External Amplifier 'Gen. Out 7-12

    Test Set CMC 156 3 x sym. guar. 3 x sym. typ. L2 only guar. L2 only typ. DC L2 only typ 0,00 25,00 50,00 75,00 100,00 125,00 V (L-N) in Vrms Figure 14 Typical (Ptyp) and guaranteed (Pmin) output power of the voltage amplifiers1 with standard design 5.2.3...

  • Page 37: Binary Outputs Relays

    Technical Data 5.2.4 Binary Outputs Relays 4 Binary outputs relays (Binary outputs 1-4) Type potential free contacts, software controlled AC break capacity 250 V 8 A; P 2000 VA DC break capacity 300 V 8 A; P 50 W (see the following limit curve) Inrush current 15 A (max.

  • Page 38: Binary Outputs Transistor

    < 3 µs (V = 5 V, R =4k7) external pullup Connector Socket "ext. Interf." (Back panel CMC 156) Isolation SELV to all other potential groups of the test set. Electrically connected to Gen. Out 7-12 and ground. Table 16 Binary outputs transistor...

  • Page 39: Inputs

    Technical Data Inputs 5.3.1 Binary Inputs 10 Binary inputs Response time typ. 220 µs (debounced) Sampling rate < 100 µs Measurement accuracy See Table 18 and Table 19 Counter function Counting frequency 3 kHz (per input) Pulse width > 150 µs (for high and low signal) Operating threshold for - Guaranteed 0: input open or load against N >...
  • Page 40 Test Set CMC 156 Time measurement on binary inputs Due to the sampling rate and to the features of the input filters, a signal present on binary inputs can only be sampled with a certain time tolerance. All input binary signals are filtered on a period of 100 µs to remove possible noise and therefore this time represents a delay in all measurements.

  • Page 41: Counter Inputs 100 Khz

    < 1 ms ± 30 V max. input voltage Connector Socket "ext. Interf." (rear panel CMC 156 ) Isolation SELV to all other potential groups of the test set. Electrically connected to Gen. Out 7-12 and ground.

  • Page 42: Measuring Inputs

    Test Set CMC 156 5.3.3 Measuring Inputs 1 Direct current measuring input Measuring range 0 to ± 20 mA max. input current 600 mA Accuracy typ. error 0.01 % guaranteed error < 0.05 % Connection 4 mm banana sockets or measuring comb. socket.

  • Page 43: Computer Interface

    Designation Host Interface The Host Interface (parallel interface) serves as connection from the CMC 156 test set to the computer (LPT or USB). If the computer is equipped with a parallel printer port, too, use the 25-pole cable (VEHK0002) that was supplied with the test set to connect the CMC 156 to the computer.

  • Page 44: Shock And Vibration

    Test Set CMC 156 5.5.2 Shock and Vibration Dynamics Vibration Tested according to IEC68-2-6 (operating mode) frequency range 10 to 150 Hz; acceleration 2 g continuous (20 m/s ); 10 sweeps, each axis. Shock Tested according to IEC68-2-27 (operating mode) 15 g/11 ms, half-sine, each axis.

  • Page 45: Safety

    Technical Data Safety Safety standards and certificates complied with European standards EN 61010-1:1993 EN 60950 +A1:1993-05 International standards IEC 1010-1 CAN/CSA-C22.2 No 1010.1-92 Certificates UL/CSA certified up to test set serial number Pxnnnx . (Example: a test set with serial number N D224C is UL/SCA-certified, a test set with the serial number Q B111D not).
  • Page 46 Test Set CMC 156...

  • Page 47: Technical Data Ep Option

    • higher output power • two current ranges (from 0 to 12.5 A and from 0 to 1.25 A)  Technical data valid for a CMC 156 test set with standard design can be found in chapter 5, "Technical Data".

  • Page 48: Outputs (Ep Option)

    Test Set CMC 156 Outputs (EP option) The power output specifications of test sets with EP option (Extended Precision) may differ in substantial extent from the standard design. For the standard design specifications, please refer to Paragraph 5.2 “Outputs”. ...

  • Page 49: Current Outputs Current Output 1-3

    Technical Data EP Option 6.1.1 Current Outputs CURRENT OUTPUT 1-3 3 current outputs range 12.5A Output currents 3 × 0 to 12,5 A 3-phase AC (L-N) 1 × 0 to 12, 5A 1-phase AC (L-N) 1 × 0 to 27 A at >45 Hz in parallel 1 ×...
  • Page 50 Test Set CMC 156 3 current outputs range 1.25A Output currents 3-phase AC (L-N) 3 × 0 to 1.25 A 1 × 0 to 1.25 A 1-phase AC (L-N) 1 × 0 to 3.75 A in parallel 1 × 0 to ± 1.25 A...
  • Page 51 Technical Data EP Option 50.0 P typ in [VA] 45.0 P gar in [VA] 40.0 35.0 30.0 25.0 20.0 15.0 10.0 I in A Figure 18 Typical (Ptyp.) and guaranteed (Pguar.) output power of the internal current amplifiers in the 12.5 A range for EP option. For a parallel connection of three current outputs a maximum output power of Pout >...
  • Page 52 Test Set CMC 156 Ptyp in [VA] Pguar in [VA] I in A Figure 20 Typical (Ptyp.) and guaranteed (Pguar.) output power of the internal current amplifiers in the 1.25 A range for option EP.

  • Page 53: Voltage Outputs Voltage Output 1-3

    Technical Data EP Option 6.1.2 Voltage Outputs VOLTAGE OUTPUT 1-3 3 voltage outputs Output voltages 3 × 0 to 127.5V 3-phase AC (L-N) 1-phase AC (L-L) 1 × 0 to 255 V (240 V + 6 % or 230 V + 10 %) 3 ×...
  • Page 54 Test Set CMC 156 160.0 3 x symm. typ. 3 x symm. typical 140.0 nur L2 belastet garantiert burden on L2 only, guarant. nur L2 belastet typ. burden on L2 only, typical 120.0 DC nur L2 belastet typ DC, burden on L2 only, typ.

  • Page 55: Output Power With Ep Option

    Technical Data EP Option 6.1.3 Output Power with EP option The output power accuracy is defined only for the system CMC 156 with EP option. Output power accuracy Accuracy (VA) 0.05 % typical; 0.1 % guaranteed Temperature drift 0.005 % / ° C max.
  • Page 56 Test Set CMC 156...

  • Page 57: Appendix

    7.1.1 Current Amplifier CMA 56 The CMA 56 is controlled via the CMC 156 . The current amplifier is located in the same compact housing as the CMC 56 test set and supplies 3 × 50 A (max. 135 VA per phase).

  • Page 58: Current Amplifier Cma 156

    The six current phases are arranged in two isolated groups and can be used independently from the phases of the CMC 156 (e.g. for differential protection testing). By connecting the current phases in series, a power of up to 280 VA can be output, which allows the testing of a wide range of electromechanical relays.
  • Page 59 Appendix Most important specifications of the CMA 156: Output currents 6-phase AC 6 x 0 to 25 A 3-phase AC 3 x 0 to 50 A 1 x 0 to ± 25 A Power 6-phase AC 6 x 70 VA at 7.5 A 3-phase AC 3 x 140 VA at 15 A 1-phase AC (L-L)

  • Page 60: Voltage And Current Amplifier Cms 156

    The three voltage phases and the three current phases of the amplifier are isolated from each other and can be used independently from the phases of the CMC 156 . This allows testing of differential relays with six independent current phases, or synchronizing devices with six independent voltage phases.
  • Page 61 Appendix Most important specifications of the CMS 156: Output voltages 3-phase AC (L-N) 3 x 0 to 250 V 1-phase AC (L-L) 1 x 0 to 500 V 3 x 0 to ± 250 V DC (L-N) Voltage outputs power 3-phase AC (L-N) 3 x 75 VA at 75 to 250 V 1-phase AC (L-N)

  • Page 62: Cmlib B - Optional Connection For Meter Testing

    Test Set CMC 156 7.1.4 CMLIB B - Optional connection for meter testing With the option CMLIB B it is easily possible to connect auxiliary equipment needed for meter testing to a CMC test set. The devices involved are: •...
  • Page 63 Appendix Principle setup: VEHK0003 Power supply CMLIB B Optical head e.g.: SH2003 Wattmeter BNC to banana connection cable VEHK0005...

  • Page 64: Ordering Notes

    Test Set CMC 156 Ordering Notes In this section ordering notes for additional devices and accessories to the CMC 156 are found. For easier identification of cables and plugs these items are represented graphically below. Plug for Plug for (CMC...
  • Page 65 Appendix Connecting cable CMC 156 – amplifier VEHK0003 Ampl. in Amplifier (CMA, CMS) Notebook (USB) Ampl. in Ampl.out Connection to computer via CMUSB-P converter VEHZ2007 ext. Interf. CMC 156 Gen. out 7 - 12 Connecting cable CMC 156 – CMLIB B...
  • Page 66 VEHS0103 Plug for Measuring Combination socket VEHS0104 Accessories CMUSB-P VEHZ2007 Converter for controlling a CMC 156 by a computer with USB port (replaces VEHK0002; see below). Option FL-6 In a number of countries (e.g., Japan), the VEHO0599 export of multiphase generators able to output steady signals with a frequency between 600 Hz and 2000 Hz is not permitted.
  • Page 67 VEHZ0005 Carrying bag for CMC 156 (mini) VEHP0100 for CMA/CMS VEHP0010 Transport case Case for CMA/CMS VEHP0011 Case for CMC 156 / 151 (mini) VEHP0101 Additional user manuals CMC 156 VESD1002 (specify language when ordering) Table 36 Ordering notes (continued)
  • Page 68 Test Set CMC 156...

  • Page 69: Contact Information/Technical Support

    OMICRON electronics GmbH Oberes Ried 1 6833 Klaus, Austria Phone: +43 5523 507-333 E-Mail: support@omicron.at Web: www.omicron.at For addresses of OMICRON offices with customer service centers. regional sales offices or offices for training. consulting and commissioning please see our website.
  • Page 70 Test Set CMC 156...

  • Page 71: Index

    Index Index output power of the internal current amplifiers ........34, 36 output power of the internal current amplifiers (EP) ......51, 52, 54 ϕ ............32, 48 parallel connection of the outputs .... 34 parallel connection of the outputs (EP) ..51 protection of the current and voltage outputs ..........
  • Page 72 Test Set CMC 156 Direct voltage measuring input ....42 Disconnection temperature ......15 Display ............11 Cables DSP .............. 13 ordering notes on ........64 CAN/CSA-C22.2 No 1010.1-92 ....45 Changing the mains fuse ........ 4 Clicking when starting up ......10 EN 61010-1/1993 .........
  • Page 73 Index Inputs binary ..........14, 39 counter inputs ........... 41 Gen. out 7-12 front panel ..........21 Installing the CMC 56 ........10 assignment ..........28 Instructions for your safety ......3 Assignment ..........30 Internal amplifer Generator Combination connector protection of the current and voltage Assignment ..........
  • Page 74 Test Set CMC 156 National standards........45 traceability ..........19 communication with ........13 Phase angle ϕ ........32, 48 Nominal frequency ........31 Nominal voltage ..........31 Phase error ..........32, 48 binary inputs ..........14 Phase resolution ........32, 48 Plugs ordering notes on ........
  • Page 75 Index Suppliers for plugs ........26 Suppliers of plugs ........23 Supply ............31 Range Switching OFF due to an overtemperature ....... 16 voltage outputs (EP) ......... 53 System components ........9 Rated (= nominal) voltage ......31 connecting the ..........9 Rated voltage System start ...........
  • Page 76 Test Set CMC 156 measuring input ........42 Warranty ............4 Ventilation slots ..........10 Weight ............45 Vibration and Shock ........44 Wiring the system components ..... 9 View front panel ..........20 rear view ........... 27 VNom ............31 Voltage amplifer CMS 156 ...........

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