CMC 256plus Technical Data Sheet Brochure ENU

User Manual: CMC-256plus-Technical-Data-Sheet-Brochure-ENU

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CMC 256plus
CMC 256plus: 6 Phase Current + 4 Phase Voltage Test Set and Universal Calibrator
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 calibration tool.
Its high precision allows the calibration of a wide range of measuring devices, including: electricity meters of class 0.2S, 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.
Operation: PC or CMControl
Technical Data

1

Current generators

Voltage generators

Setting 6-phase AC (L-N)
range 3-phase AC (L-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

6-phase AC (L-N)

Group A
1-phase
and B in
AC (L-L)
series

10

Accuracy 2
Distortion (THD+N) 4
Ranges
Resolution
(for respective range)
Max. compliance voltage
(L-N)/(L-L)
Connection

1 x 0 ... 600 V

DC (L-N)
3-phase AC (L-N)

Power

4 x 0 ... ±300 V
3 x 100 VA typ. at 100 ... 300 V
3 x 85 VA guar. at 85 ... 300 V
4 x 75 VA typ. at 100 ... 300 V
4 x 50 VA guar. at 85 ... 300 V
1 x 200 VA typ. at 100 ... 300 V
1 x 150 VA guar. at 75 ... 300 V
1 x 275 VA typ. at 200 ... 600 V
1 x 250 VA guar. at 200 ... 600 V
1 x 420 W typ. at ±300 V
1 x 360 W guar. at ±300 V

4-phase AC (L-N)
1-phase AC (L-N)
1-phase AC (L-L)
DC (L-N)

300
250
200
150
100
50
0
0

1-phase AC (L-L)
1-phase AC (L-N)
3-phase AC (L-N)
4-phase AC (L-N)
100

Accuracy 5

25
50
Output current / A

75

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
< 0.025 % typ., < 0.07 % guar.
1.25 A / 12.5 A (Group A, B) or 2.5 A / 25 A (Group A II B)
50 µA / 100 µA / 500 µA / 1 mA

200 300 400 500
Output voltage / V

600

Distortion (THD+N) 4

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
0.015 % typ., < 0.05 % guar.

Ranges

150 V / 300 V

Resolution
Connection

5 mV / 10 mV in range 150 V / 300 V
4 mm (0.16 in) banana sockets /
combination socket (1,2,3,N)

Generators, general
Frequency

15 Vpk / 60 Vpk
4 mm (0.16 in) banana sockets / combination socket
(Group A only)

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 Ω
3
rd. = reading, rg. = range
4
THD+N: Values at 50/60 Hz, > 1 A / 20 V with 20 kHz bandwidth
5
Rload: > 250 Ω
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 Ω and 1 VA max., cos φ = 0.5 to 1
Range 12.5 A: 0 to 0.5 Ω 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
1

1-phase AC (L-L)

1-phase AC (L-N)

3-phase AC (L-N)
0

3-phase AC (L-N)

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

Output power (typ.) / VA

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)
1 x 480 W typ. at ±35 A (Group A II B),
DC (3L-N)
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

4-phase AC (L-N)

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

1-phase AC (3L-N)

Output power (typ.) / VA

Power

Setting range

6 x 0 ... 12.5 A

Phase

Range sine signals

10 ... 1000 Hz

Range harmonics /
interharmonics 6
Range transient
signals 6
Accuracy / drift

10 ... 3000 Hz

±0.5 ppm / ±1 ppm

Resolution

< 5 µHz

Angle range

-360° ... +360°

Resolution

0.001°

Error at 50 / 60 Hz

< 0.005° typ., < 0.02° guar.

Bandwidth (-3 dB)
Simulated power
S, P (calibration of
energy meters)

DC ... 3.1 kHz

3.1 kHz
Accuracy 7

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

Temperature drift

< 0.001 % / °C typ., < 0.005 % / °C guar.

Technical Data CMC 256plus (continued)
Low level outputs 1

Binary outputs, transistor

Number of outputs

6 (12 with Option LLO-2)

Type

Open collector transistor outputs

Setting range
Max. output current

0 ... ±10 Vpk
1 mA

Number

4

Update rate

10 kHz

Accuracy

Imax

5 mA

Resolution

Error < 0.025 % typ., < 0.07 % guar.
at 1 ... 10 Vpk
250 µV

Connection

16 pin combination socket (rear side)

Distortion (THD+N) 2

< 0.015 % typ., < 0.05 % guar.

Unconventional CT/VT simulation

linear, Rogowski (transient and sinewave)

Measuring range

0 ... ±10 V

Overload indication

Yes

Accuracy

Isolation

SELV

Input impedance

Error < 0.003 % rg. 3 typ.,
< 0.02 % rg. guar.
1 MΩ

Usability

Completely independent from internal
amplifier outputs
16 pin combination socket (rear side)

DC current measuring input

Connection
Auxiliary DC supply
Voltage ranges
Power

0 ... 264 VDC, 0.2 A / 0 ... 132 VDC,
0.4 A / 0 ... 66 VDC, 0.8 A
Max. 50 W

Accuracy

Error < 2 % typ., < 5 % guar.

DC voltage measuring input

Measuring range

0 ... ±1 mA, 0 ... ±20 mA

Accuracy

Error < 0.003 % rg. 3 typ., < 0.02 % rg. guar.

Input impedance

15 Ω

Analog AC+DC measuring inputs 4

Number

AC + DC analog voltage inputs (current
measurement with external current
clamps or shunt resistors)
10

Number

10

Nominal input ranges (RMS values)

100 mV, 1 V, 10 V, 100 V, 600 V

Trigger criteria

Amplitude accuracy

Error < 0.06 % typ., < 0.15 % guar.

Input characteristics

Toggling of potential-free contacts or DC
voltage compared to threshold voltage
0 ... ±600 VDC threshold or potential-free

Bandwidth

DC ... 10 kHz

Ranges

100 mV / 1 V / 10 V / 100 V / 600 V

Sampling frequency

28.44 kHz, 9.48 kHz, 3.16 kHz

Resolution of threshold

500 kΩ // 50 pF

Transient input buffer at 28 kHz

Sample rate

±2 mV, ±20 mV, ±200 mV, ±2 V,
±20 V in ranges
10 kHz (resolution 100 µs)

Input impedance

Time stamping accuracy

±0.00015 % of rd.3 ±70 µs

Max. measuring time

Infinite

Debounce / Deglitch time

0 ... 25 ms / 0 ... 25 ms

Counting function

< 3 kHz at pulse width > 150 µs

Galvanic isolation

5 galvanically isolated groups (2+2+2+2+2)

Max. input voltage

CAT IV / 150 V, CAT III / 300 V,
CAT II / 600 V (850 Vpk)

Input overload indication

3.5 s for 10 input channels / 35 s for 1
input channel
31 s for 10 input channels / 5 min. for 1
input channel
Threshold voltage, power quality trigger:
sag, swell, harmonic, frequency, frequency
change, notch
I (AC + DC), V (AC + DC), phase, frequency,
power, harmonics, transient recording,
event recording, trend recording
Yes

Input protection

Yes

Max. input voltage

CAT IV / 150 V, CAT III / 300 V, CAT II /
600 V (850 Vpk)
5 groups (2+2+2+2+2)

Binary inputs

Counter inputs 100 kHz
Number

2

Max. counting frequency

100 kHz

Pulse width

> 3 µs

Threshold voltage

6V

Voltage hysteresis

2V

Max. input voltage

±30 V

Isolation

SELV

Connection

16 pin combination socket (rear side)

Trigger on overload
Supported generators

Current generators

Timer accuracy

Error < 1 ms

Binary outputs, relays
Type
Number

Potential-free relay contacts, software
controlled
4

Break capacity AC

Vmax: 300 VAC / Imax: 8 A / Pmax: 2000 VA

Break capacity DC

Vmax: 300 VDC / Imax: 8 A / Pmax: 50 W

1

2

3
4

For directly testing relays with low level inputs by simulating signals from non
conventional CTs and VTs with low level interfaces and for controlling external
amplifier units
THD+N: Values at 50/60 Hz, 20 kHz measurement bandwidth, nominal value,
and nominal load
rd. = reading, rg. = range
Up to three inputs can be used for measuring RMS values, frequency, and
phase angle without the EnerLyzer software license. Full functionality requires
EnerLyzer software license

Type

Transient input buffer at 3 kHz
Transient trigger

Measurement functions

Galvanic isolation
Time synchronization
Timing accuracy
IRIG-B synchronization with CMIRIG-B
GPS synchronization with CMGPS 588
To external voltage

Error < 1 µs typ., < 5 µs guar.
Error < 1 µs typ., < 5 µs guar.
Reference signal on binary input 10:
10 ... 300 V / 15 ... 70 Hz
Precision Time Protocol (PTP)
IEEE 1588-2008
IEEE C37.238-2011 (Power Profile)
With the unique PermaSync functionality, analog and Sampled Values outputs stay
permanently in sync with the internal CMC time reference.
When a CMC is time-synchronized (IRIG-B, GPS, or PTP), the output quantities are
continuously synchronized to the external time source.
With CMIRIG-B it is also possible to transmit the internal PPS signal of the CMC to the
device under test (e.g. PMUs or IEDs stimulated with a synchronized Sampled Values
data stream).

Miscellaneous

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
Mapping of data attributes from subscribed GOOSE
messages to binary inputs.
Number of virtual binary inputs: 360
Number of GOOSEs to be subscribed: 128
Type 1A; Class P2/3 (IEC 61850-5).
Processing time (application to network or vice
versa): < 1 ms
Selectable priority and VLAN-ID

Weight

16.0 kg (35.3 lbs)

Dimensions
(W x H x D, without handle)
PC connection

450 x 145 x 390 mm (17.7 x 5.7 x 15.4 in)

Signal indication (LED)

Two PoE 4 Ethernet ports:
• 10/100/1000 Base-TX
• IEEE 802.3af compliant
• Port capability limited to one Class 1 (3.84 W) and
one Class 2 (6.49 W) powered device
USB port:
• USB 2.0 High Speed up to 480 Mbit/s
USB 1.1-compatible
> 42 V for voltage outputs and AUX DC

IEC 61850 Sampled Values (Publishing) 1

Connection to ground (earth)

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

Specification

Hardware diagnostics

Self diagnostics upon each start-up

Galvanically separated groups

The following groups are galvanically separated from
each other: mains, voltage amplifier output, current
amplifier group A/B, auxiliary DC supply, binary/
analog input
All current and voltage outputs are fully overload and
short circuit proof and protected against external
high-voltage transient signals and over temperature

Subscription

Performance

VLAN support

VLAN support

According to the “Implementation Guideline for
Digital Interface to Instrument Transformers Using
IEC 61850-9-2“ of the UCA International Users Group
80 samples per cycle for nominal frequencies of
50 Hz and 60 Hz.
Synchronization attribute (smpSynch) is set when the
CMC is in synchronized operation mode.
Sample count (smpCnt) zero is aligned with top of
the second.
Accuracy data see above
Selectable priority and VLAN-ID

Max. number of SV streams

2 (with option LLO-2: 3 SV streams)

Sampling Rate
Synchronization

Protection

Certifications

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

Rated current

12 A at 115 V / 10 A at 230 V

Connection

Standard AC socket (IEC 60320)

Developed and manufactured under an ISO 9001
registered system

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 at 10 ... 150 Hz)

Shock

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

2

Safety standards, electromagnetic compatibility
EMC
International
USA
Safety

The product adheres to the electromagnetic com­pa­
ti­bility (EMC) Directive 2004/108/EC (CE conform).
IEC 61326-1; IEC 61000-6-4; IEC 61000-3-2/3
FCC Subpart B of Part 15 Class A

The product adheres to the low voltage Directive
2006/95/EC (CE conform).
International / USA IEC 61010-1 / UL 61010-1
Canada

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

Ordering Information
CMC 256plus with Test Universe software
VE002701
CMC 256plus Basic
VE002702
CMC 256plus Protection
VE002703
CMC 256plus Advanced Protection
VE002704
CMC 256plus Universal
VE002705
CMC 256plus Meter
VE002706
CMC 256plus Measurement
VE002720
CMC 256plus Recloser
CMC 256plus with CMControl (without Test Universe software)
VE002715
CMC 256plus with CMControl P
VE002719
CMC 256plus with CMControl R
VE002721
CMC 256plus with CMControl P App activation key
VE002723
CMC 256plus with CMControl R App activation key
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
VEHO2704
Option LLO-2 if ordered as an upgrade

1

2

3

4

Testing with GOOSE and Sampled Values functionality requires software
licences for the corresponding configuration modules
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
For an operational temperature above +30 °C (+86 °F) a duty cycle of down to
50 % may apply
PoE = Power over Ethernet



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