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Omicron CMC256-6 Relay Test Set – Advanced, Universal and Protection. The CMC 256-6 is the first choice for applications requiring very high accuracy. This unit is not only an excellent test set for protection devices of all kinds but also a universal calibrator. Its high precision allows the calibration of a wide range of measuring devices.

The CMC 256plus is the first choice for applications requiring very high accuracy. This unit is
not only an excellent test set for protection devices of all kinds but also a universal calibra-
tion tool. Its high precision allows the calibration of a wide range of measuring devices,
including: electricity meters of class 0.2, measuring transducers, power quality measurement
devices and phasor measurement units (PMU). Its unique accuracy and flexibility make the
CMC 256plus ideal for protection and measurement equipment manufacturers for research
and development, production and type testing. The CMC 256plus can either be operated by
the Test Universe software running on a PC or by the front panel control device CMControl.

CMC 256plus: 6 Phase Current + 4 Phase Voltage Test Set and Universal Calibrator

Current generators
Setting range 6-phase AC (L-N)

6 x 0 .. 12.5 A

3-phase AC (L-N)

3 x 0 .. 25 A (Group A II B)

1-phase AC (3L-N)

1 x 0 .. 75 A (Group A II B), 2 x 0 .. 37.5 A

DC (3L-N)

1 x 0 .. ±35 A (Group A II B), 2 x 0 .. ±17.5 A

Power

6-phase AC (L-N)

6 x 80 VA typ. at 8.5 A, 6 x 70 VA guar. at 7.5 A

3-phase AC (L-N)

3 x 160 VA typ. at 17 A (Group A II B)
3 x 140 VA guar. at 15 A (Group A II B)

1-phase AC (3L-N)

1 x 480 VA typ. at 51 A (Group A II B),
2 x 240 VA at 25.5 A
1 x 420 VA guar. at 45 A (Group A II B),
2 x 210 VA at 22.5 A

1-phase AC (L-L)

1 x 320 VA typ. at 8.5 A (Group A II B),
2 x 160 VA at 8.5 A
1 x 280 VA guar. at 15 A (Group A II B),
2 x 140 VA at 7.5 A

1-phase AC (L-L-L-L) 1 x 320 VA typ. at 8.5 A

(40 VRMS, Group A and B in series)
1 x 280 VA guar. at 7.5 A
(40 VRMS, Group A and B in series)

DC (3L-N)

1 x 480 W typ. at ±35 A (Group A II B),
2 x 240 W at ±17.5 A
1 x 470 W guar. at ±35 A (Group A II B),
2 x 235 W at ±17.5 A

500
400
300
200
100

0

0

10

25

50

75

Output current / A

Group A
and B in
series

1-phase
AC (L-L)

3-phase AC (L-N)

1-phase AC (L-N)

Output po

w

er (typ.) / V

A

Accuracy

2

error < 0.015 % rd.

3

+ 0.005 % rg.

3

typ.

at 0 .. 12.5 A
error < 0.04 % rd. + 0.01 % rg. guar.
at 0 .. 12.5 A

Omicron Cmc 256 6 User Manual

Distortion (THD+N)

4

< 0.025 % typ., < 0.07 % guar.

Ranges

1.25 A / 12.5 A (Group A, B) or
2.5 A / 25 A (Group A II B)

Resolution (for respective range)

50 µA / 100 µA / 500 µA / 1 mA

Max. compliance voltage (L-N)/(L-L) 15 Vpk / 60 Vpk
Connection

4 mm (0.16 in) banana sockets / combination
socket (Group A only)

Voltage generators
Setting range

4-phase AC (L-N)

4 x 0 .. 300 V (VL4(t) automatically
calculated: VL4 = (VL1+VL2+VL3)*c
or freely programmable)

3-phase AC (L-N)

3 x 0 .. 300 V

1-phase AC (L-L)

1 x 0 .. 600 V

DC (L-N)

4 x 0 .. ±300 V

Power

3-phase AC (L-N)

3 x 100 VA typ. at 100 .. 300 V
3 x 85 VA guar. at 85 .. 300 V

4-phase AC (L-N)

4 x 75 VA typ. at 100 .. 300 V
4 x 50 VA guar. at 85 .. 300 V

1-phase AC (L-N)

1 x 200 VA typ. at 100 .. 300 V
1 x 150 VA guar. at 75 .. 300 V

1-phase AC (L-L)

1 x 275 VA typ. at 200 .. 600 V
1 x 250 VA guar. at 200 .. 600 V

DC (L-N)

1 x 420 W typ. at ±300 V
1 x 360 W guar. at ±300 V

Output voltage / V

Output po

w

er (typ.) / V

A

1-phase AC (L-L)

1-phase AC (L-N)

3-phase AC (L-N)

4-phase AC (L-N)

300

250

200

150

100

50

0

0

100

200

300

400

500

600

Accuracy

5

error < 0.015 % rd.

3

+ 0.005 % rg.

3

typ. at 0 .. 300 V
error < 0.04 % rd. + 0.01 % rg. guar.
at 0 .. 300 V

Distortion (THD+N)

4

0.015 % typ., < 0.05 % guar.

Ranges

150 V / 300 V

Resolution

5 mV / 10 mV in range 150 V / 300 V

Connection

4 mm (0.16 in) banana sockets /
combination socket (1,2,3,N)

Generators, general
Frequency

range sine signals Ipod shuffle generation 4 user manual.

10 .. 1000 Hz

range harmonics /
interharmonics

6

10 .. 3000 Hz

range transient signals

6

User

DC .. 3.1 kHz

accuracy / drift

±0.5 ppm / ±1 ppm

resolution

< 5 µHz

Phase

angle range

-360° .. +360°

resolution

0.001°

error at 50 / 60 Hz

< 0.005° typ., < 0.02° guar.

Bandwidth (-3 dB)

3.1 kHz

Simulated power
S, P (calibration
of energy meters)

accuracy

7

error < 0.05 % rd. typ., < 0.1 % rd.
guar.

temperature drift

< 0.001 % / °C typ., < 0.05 % / °C guar.

Omicron Cmc 256-6 User Manual Pdf

Technical Data

1

1

All data specified are guaranteed, except where indicated otherwise.

OMICRON guarantees the specified data for one year after factory calibration,

within 23 °C ±5 °C (73 °F ±10 °F) in the frequency range from 10 to 100 Hz and

after a warm-up phase > 25 minutes

2

Rload: 0 .. 0.5 W

3

rd. = reading, rg. = range

4

THD+N: Values at 50/60 Hz, > 1 A / 20 V with 20 kHz bandwidth

5

Rload: > 250 W

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6

Amplitude derating at > 1000 Hz

7

Data are valid from 0.1 to 12.5 A (current amplifier A or B) and 50 to 300 V

(voltage amplifier) at 50/60 Hz

Permissible load for current outputs:

Range 1.25 A: 0 to 1 W and 1 VA max., cos ϕ = 0.5 to 1

Range 12.5 A: 0 to 0.5 W and 6 VA max., cos ϕ = 0.5 to 1

Permissible load for voltage outputs:

10 VA max. at 50 to 300 V, cos ϕ = 0.5 to 1

CMC 256plus

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Table of contents
  • Test Set Overview
  • CMControl
  • Test Universe Software
  • Software
    • QuickCMC
      • State Sequencer
      • Ramping
      • TransPlay: Transient Playback Tool
      • Harmonics
      • Binary I/O Monitor
      • CB Simulation
      • Pulse Ramping
      • Overcurrent
      • Overcurrent Characteristics Grabber
      • Distance
      • Differential
      • Autoreclosure
      • Advanced Distance
      • VI Starting
      • Advanced Differential
      • Annunciation Checker
      • Synchronizer
      • Transient Ground Fault
      • Advanced TransPlay
      • Meter
      • Transducer
      • OMICRON Control Center
      • Pause Module, Text View, ExeCute
      • Test Object Definition with XRIO ®
      • PTL Protection Testing Library
      • CM Engine Programming Interface
      • cm_FCS Field Calibration Software
  • Additional Software
    • NetSim Network Simulation Software
      • EnerLyzer TM
      • TransView
      • PQ Signal Generator
  • IEC 61850 Testing Tools
    • IEDScout 
      • GOOSE
      • Sampled Values (SV)
      • IEC 61850 Package
      • SVScout
      • CMC 850 Package 
  • Scheme Testing Tools
    • CommPro
      • LogicPro
      • DLogicPro
  • Test Sets
    • CMC 356: 6 Phase Current + 4 Phase Voltage Test Set and Commissioning Tool
      • CMC 353: 3 Phase Current + 4 Phase Voltage Test Set and Commissioning Tool
      • CMControl: Front Panel Control for CMC Test Sets
      • CMC 850: IEC 61850 Test Set
  • Amplifier Units
    • CMA 156: 6 Phase Current Amplifier (6 x 25 A)
      • CMS 156: 3 Phase Voltage and Current Amplifier (3 x 250 V, 3 x 25 A)
  • Accessories
    • CMGPS Synchronization Unit
      • CMIRIG-B Interface
      • CMB IO-7
      • Scanning Heads and Related Accessories
      • Cable Connector for REF 54x
      • CMLIB A Low Level Signal Connector
      • CPOL Polarity Checker
      • C-Probe 1 Current Clamp
      • C-Shunt 1
      • C-Shunt 10
      • Converter optical – electrical
      • CMUSB-P USB to Parallel Converter
      • Generator Combination Cable
      • CMC Wiring Accessory Package
      • Standard CMx Accessories
      • Transport Cases
      • Foldable Stand
      • CM Recloser and Sectionalizer Test Cables
  • Other Test Equipment
    • CPC 100 & CP CU1
      • CT Analzyer
        • Contacts
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Miscellaneous
Weight

15.9 kg (35 lbs)

Dimensions (W x H x D, without handle) 450 x 145 x 390 mm (17.7 x 5.7 x 15.4 in)
PC connection

Two 10/100 Mbit/s PoE

4

Ethernet ports:

• 10/100 Mbit/s (10/100 Base-TX,

auto-sensing, auto-crossover, RJ45
connector for twisted pair cables)

• IEEE 802.3af compliant
• Port capability limited to one Class 1

(3.84 W) and one Class 2 (6.49 W)
powered device

If equipped with PAR-1 option: Parallel
port (IEEE 1284-C connector). Replaces
the standard Ethernet interfaces by a
parallel port if required by the used PC or
if the binary extension device CMB IO-7
should be used

5

Signal indication (LED)

> 42 V for voltage outputs and AUX DC

Connection to ground (earth)

4 mm (0.16 in) banana socket (rear side)

Hardware diagnostics

Self diagnostics upon each start-up

Galvanically separated groups

The following groups are galvanically
separated from each other: mains, volt-
age amplifier output, current amplifier
group A/B, auxiliary DC supply, binary/
analog input

Protection

All current and voltage outputs are fully
overload and short circuit proof and
protected against external high-voltage
transient signals and over temperature

Certifications

Developed and manufactured under an
ISO 9001 registered system

Technical Data CMC 256plus (continued)

IEC 61850 GOOSE

1

Simulation

Mapping of binary outputs to data attributes in
published GOOSE messages.
Number of virtual binary outputs: 360
Number of GOOSEs to be published: 128

Subscription

Mapping of data attributes from subscribed GOOSE
messages to binary inputs.
Number of virtual binary inputs: 360
Number of GOOSEs to be subscribed: 128

Performance

Type 1A; Class P2/3 (IEC 61850-5).
Processing time (application to network or vice versa):
< 1 ms

VLAN support

Selectable priority and VLAN-ID

IEC 61850 Sampled Values (Publishing)

1

Specification

According to the “Implementation Guideline for
Digital Interface to Instrument Transformers Using
IEC 61850-9-2“ of the UCA International Users Group

Sampling Rate

80 samples per cycle for nominal frequencies of 50
Hz and 60 Hz; synchronized with CMIRIG-B.

Synchronization

Synchronization attribute (smpSynch) is set when
the CMC is in synchronized operation mode utilizing
CMIRIG-B.
Sample count (smpCnt) zero is aligned with top of
the second (IRIG-B and PPS)
Accuracy data see above

VLAN support

Selectable priority and VLAN-ID

Max. number of SV streams 2 (with option LLO-2: 3 SV streams)
Power supply
Nominal input voltage

2

100 – 240 VAC, 1-phase

Permissible input voltage

85 .. 264 VAC

Nominal frequency

50/60 Hz

Permissible frequency range 45 .. 65 Hz
Power consumption

1.4 kVA at 115 V

/ 2.3 kVA at 230 V

Rated current

12 A at 115 V / 10 A at 230 V

Connection

Standard AC socket (IEC 60320)

Environmental conditions
Operation temperature

3

0 .. +50 °C (+32 .. +122 °F)

Storage temperature

-25 .. +70 °C (-13 .. +158 °F)

Humidity range

Relative humidity 5 .. 95 %, non-condensing

Vibration

IEC 60068-2-6 (20 m/s

2

at 10 .. 150 Hz)

Shock

Omicron Cmc 256 6 User Manual Verizon

IEC 60068-2-27 (15 g/11 ms half-sine)

Safety Standards, Electromagnetic Compatibility
EMC

The product adheres to the electromagnetic compat-
ibility (EMC) Directive 2004/108/EC (CE conform).

Emission

Europe EN 61326-1; EN 61000-6-4; EN 61000-3-2/3

International IEC 61326-1;IEC 61000-6-4; IEC 61000-3-2/3

USA FCC Subpart B of Part 15 Class A

Immunity

Europe EN 61326-1; EN 61000-6-2;

EN 61000-4-2/3/4/5/6/11

International IEC 61326-1;IEC 61000-6-2;

IEC 61000-4-2/3/4/5/6/11

Safety

The product adheres to the low voltage Directive
2006/95/EC (CE conform).

Europe EN 61010-1 Insulation of PC and SELV interfaces

complies with EN 60950-1

International IEC 61010-1

USA UL 61010-1

Canada CAN/CSA-C22.2 No 61010-1-04

1

Testing with GOOSE and Sampled Values functionality requires software licences for

the corresponding configuration modules

2

For line inputs below 115 VAC, it is not possible to drive all outputs (voltage

output, current output, Aux DC) simultaneously at full load. All other technical

specifications (e.g. the maximum output power of a single amplifier) are not

affected

3

For an operational temperature above +30 °C (+86 °F) a duty cycle of down to

50 % may apply

4

PoE = Power over Ethernet

5

CMC 256plus with PAR-1 option is connected to the USB port of the PC by means

of the parallelport cable and the CMUSB-P (USB to Parallel Port Converter).

CMC 256plus equipped with the PAR-1 option can not be extended with the LLO-2

option and does not support the CMIRIG-B accessory

Ordering Information

CMC 256plus with Test Universe Software

VE002701

CMC 256plus Basic

Omicron Cmc 256 Manual

VE002702

CMC 256plus Protection

VE002703

CMC 256plus Advanced Protection

VE002704

CMC 256plus Universal

VE002705

CMC 256plus Meter

VE002706

CMC 256plus Measurement

CMC 256plus with CMControl (without Test Universe Software)

VE002715

CMC 256plus with CMControl-6

Omicron Cmc 256-6

The CMControl can also be ordered as add-on together with a
CMC 256plus with Test Universe software or as a later upgrade.

CMC 256plus Hardware Options

VEHO2703

Option LLO-2 if ordered with a new unit

Omicron Cmc 256 Plus Manual

VEHO2704

Option LLO-2 if ordered as an upgrade

VEHO2701

Option PAR-1 if ordered with a new unit

5

VEHO2702

Option PAR-1 if ordered as an upgrade

5

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Omicron Cmc 156

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