Circutor CVM-MINI SERIES, CVM-MINI-ITF-HAR-RS485-C2, CVM-MINI-ITF-Plus-RS485-C2, CVM-MINI-Shunt, CVM-MINI-ITF Instruction Manual

POWER ANALYZER

CVM-MINI SERIES

INSTRUCTION MANUAL

M98174001-03-19A

CIRCUTOR, SA

Page 2 of 26

CONTENTS

1 BASIC INSTRUCTIONS .............................................................................................................. 3

1.1 Checks on receipt. ............................................................................................................ 3

1.2 Main features ................................................................................................................... 3

1.3 Electrical parameters ........................................................................................................ 3

1.4 Other features .................................................................................................................. 4

1.5 Available models ............................................................................................................. 4

2 INSTALLATION AND START-UP ............................................................................................... 5

2.1 Installation ...................................................................................................................... 5

2.1.1 Power supply voltage .................................................................................................. 5

2.1.2 Maximum voltage in the voltage measurement circuit ................................................... 5

2.1.3 Maximum permanent current in the current circuit ........................................................ 5

2.1.4 Transistor output features ............................................................................................ 5

2.1.5 Temperature probe features ......................................................................................... 5

2.1.6 Operating conditions .................................................................................................. 6

2.1.7 Safety ........................................................................................................................ 6

2.2 Start-up ........................................................................................................................... 6

2.2.1 Description of terminals .............................................................................................. 6

2.2.2 Connection diagrams .................................................................................................. 7

3 OPERATING MODE .................................................................................................................... 7

3.1 Keypad ........................................................................................................................... 8

3.2 Default settings ................................................................................................................ 8

3.2.1 Default display ........................................................................................................... 9

3.2.2 LED Indicators......................................................................................................... 10

4 SETTING SET-UP ...................................................................................................................... 10

4.1 Measurement Set-up ....................................................................................................... 10

4.1.1 Transformation Ratios .............................................................................................. 11

4.1.1.1 Voltage primary value ........................................................................................ 11

4.1.1.2 Voltage secondary value ..................................................................................... 11

4.1.1.3 Current primary value ......................................................................................... 11

4.1.1.4 Current secondary value ..................................................................................... 12

4.1.2 Measurement in 2 or 4 quadrants ............................................................................... 12

4.1.3 Power demand meter parameterisation ....................................................................... 13

4.1.3.1 Integrated parameter ........................................................................................... 13

4.1.3.2 Integration period ............................................................................................... 13

4.1.3.3 Clearing power demand meter value .................................................................... 14

4.1.4 Display and backlight ............................................................................................... 14

4.1.4.1 Selection of screens to be displayed ..................................................................... 14

4.1.4.2 Selection of start page ........................................................................................ 14

4.1.4.3 Backlight (Backlit display).................................................................................. 15

4.1.5 Clearing energy meter values .................................................................................... 15

4.1.6 Setting THd or d ...................................................................................................... 15

4.1.7 Digital output for the transistor (2) ............................................................................. 15

4.1.7.1 Impulse per n KW·h or Kvar·h consumed or generated ......................................... 16

4.1.7.2 Alarm condition ................................................................................................. 16

4.2 Communication Set-up ................................................................................................... 19

4.2.1 Default settings ........................................................................................................ 19

4.2.2 Peripheral number .................................................................................................... 20

4.2.3 Transmission speed .................................................................................................. 20

4.2.4 Parity ...................................................................................................................... 20

4.2.5 Data bits .................................................................................................................. 21

4.2.6 Stop bits .................................................................................................................. 21

4.2.7 Protection of data Set-up using password ................................................................... 21

5 APPENDIX – CVM-MINI-ITF-HAR-RS485-C2 SERIES .............................................................. 22

6 MODBUS RTU PROTOCOL ...................................................................................................... 23

6.1 MODBUS memory map ................................................................................................. 23

6.2 RS485 Connection diagram ............................................................................................ 26

7 TECHNICAL SERVICE ............................................................................................................. 26

Page 3 of 26

1 BASIC INSTRUCTIONS

This manual is designed to familiarise the user with operating the CVM-MINI power
analyzer in order to get the best from its features.

1.1 Checks on receipt.

Please check the following points on receipt of the analyzer:

• The equipment delivered matches your order specifications.

• Check that the equipment has not been damaged during delivery.

• Check that it has the correct instruction manual.

This manual contains information and warnings about the CVM-MINI

analyzer which must be followed to guarantee the proper operation of all
instrument functions and to maintain it in a safe condition.

Installing and maintenance for this analyzer must be carried out by a
qualified person.

1.2 Main features

The CVM-MINI panel analyzer is a programmable measuring instrument; it offers a
series of options for using it, which may be selected from configuration menus on the
instrument itself. Before starting the analyzer carefully read sections: power supply,
connection and setting and select the most suitable form of operation in order to obtain
the required data.

The CVM-MINI measures, calculates and displays the main electrical

parameters for three-

phase, balanced or unbalanced industrial

systems.

Measurements are taken in true effective value using the three
alternating and neutral voltage inputs and three current inputs to

measure IN /1A or IN

/5A secondaries from external measurement

transformers.

Figure 1. [CVM-MINI]

The CVM-MINI allows the display of all electrical parameters, using the backlit LCD
display, showing three instant electrical parameters, maximum or minimum on each
page jump.

1.3 Electrical parameters

By using its internal processor, the CVM-MINI shows on the screen and through
communication (according to model), over 100 parameters, which may be either single­phase or three-phase. These parameters may or may not be displayed on the screen,
according to the equipment’s preset values.

Page 4 of 26

PARAMETER

UNIT

L1

L2

L3

III

Phase-neutral voltage

V f-n

• • • Phase-phase voltage

V f-f

• • •

Current

A

• • •

••

Frequency

Hz

•

Active power

kW

• • •

•

Reactive power L

kvarL

• • •

•

Reactive power C

kvarC

• • •

•

Apparent power

kVA

• • • • Power factor

PF

• • • • Cos ϕ

Cos ϕ

•

Maximum demand

Pd

• • •

•

Neutral current

IN

•

Voltage THD

% THD - V

• • •

Current THD

% THD - A

• • •

kWh (consumption and generation)

W·h

•

kvarh.L (consumption and generation)

W·h

•

kvarh.C (consumption and generation)

W·h

•

kVAh (consumption and generation)

W·h

•

Harmonic content (V and A) *

%

• • •

15th

Temperature

ºC

•

( • ) Available through display and communications.
( •• ) Only available through communications.
( * ) Harmonic content in HAR model.

1.4 Other features

• A small sized instrument with a 85x52x70mm (3 steps).

• Measurement in true effective value (TRMS).

• Instant, maximum, minimum values for each parameter.

• Energy measurer function.

• 1 GW·h counter in consumed energy.

• 100 MW·h counter in generated energy.

• Backlit LCD display.

• Built in RS485 communications (Modbus RTU®).

• Temperature probe built in the equipment.

1.5 Available models

CODE

REFERENCE

Ci r c
ut or
UER1 .0 0

M52000

CVM-MINI-Shunt

M52010

CVM-MINI-ITF

M52021

CVM-MINI-ITF-RS485-C2

M52031

CVM-MINI-ITF-HAR-RS485-C2

M52022

CVM-MINI-ITF-Plus-RS485-C2

Page 5 of 26

2 INSTALLATION AND START-UP

This manual contains information and warnings about the analyzer which must be
followed to guarantee the proper operation of all instrument functions and to maintain it
in a safe condition. The analyzer must not be switched on until it is finally connected to
the electrical board.

If the equipment is handled in a way not specified by the manufacturer, the

equipment's protection may be compromised.

When it is likely that the equipment has lost its protection (i.e. with visible damage), it
must be disconnected from the auxiliary supply. In this event, contact a qualified
technical service representative.

2.1 Installation

The following features must be taken into consideration before supplying power to the
equipment:

2.1.1 Power supply voltage

Standard model power supply: Single-phase 230 V AC.
Plus model power supply: 85…265 V AC. / 95…300 V DC.
Frequency: 50 Hz … 60 Hz
Power supply tolerance: -15 % / +10%
Connection terminals: 14 - 15
Equipment consumption: 3 VA

2.1.2 Maximum voltage in the voltage measurement circuit

Voltage: 300 V ∼ AC. phase-neutral

520 V ∼ AC. phase-phase

Frequency: 50 Hz … 60 Hz

2.1.3 Maximum permanent current in the current circuit

In scale IN /1A: 1.2 amperes
In scale I

N

/5A: 6.0 amperes

2.1.4 Transistor output features

Type NPN transistor: Opto-insulated / Open Collector
Maximum operating voltage: 24 V DC.
Maximum operating current: 50 mA
Maximum frequency: 5 impulses / second
Impulse length: 100 ms

2.1.5 Temperature probe features

The CVM-MINI has a built in temperature sensor. The sensor has a ± 2ºC
accuracy and a temperature measurement range of -10ºC +50ºC.

The interior temperature of the CVM-MINI has been estimated at 14.0 ºC above
the interior of the cabinet where it has been installed, if the cabinet has no
ventilation. If the cabinet has forced ventilation then the temperature of the CVM
is 3.5 ºC higher.

Page 6 of 26

2.1.6 Operating conditions

Operating temperature: -10 ºC / +50ºC
Relative humidity: 5 to 95 % RH (without condensation)
Altitude: Up to 2000 metres

2.1.7 Safety

Designed for category III installations, 300 V ∼ AC (EN 61010).
Class II double insulation against electric shock protection.

2.2 Start-up

The equipment is mounted on a DIN rail 46277 (EN 50022). All connections must
remain inside the electrical board.

Note that when the instrument is switched on, the terminals may be dangerous

when touched and opening or removing parts may access dangerous areas.

Therefore, the equipment must not be used until it is properly installed.

The equipment must be connected to a power supply circuit protected with gl (IEC 269)
or type M fuses between 0.5 and 2 A. It must have an overload/short circuit switch or
equivalent device in order to disconnect the equipment from the power supply system.
An earth leakage switch or similar device must be fitted to disconnect the equipment
from the power supply system. The power supply circuit and the voltage measurement
circuit are connected with a cable with a minimum diameter of 1 mm

2

.
The secondary line for the current transformer shall have a minimum diameter of 2.5
mm

2

.

2.2.1 Description of terminals

TERMINAL

TERMINAL DESCRIPTION

1

Current input AL1 - S1

2

Current input AL1 - S2

3

Current input AL2 - S1

4

Current input AL2 - S2

5

Current input AL3 - S1

6

Current input AL3 - S2

7

Transistor output RL2

8

Common transistor output

9

Transistor output RL1

10

Measurement VL3

11

Measurement VL2

12

Measurement VL1

13

Neutral V measurement

14

Power supply voltage input

15

Power supply voltage input

A

RS-485 (+)

S

RS-485 (GND)

B

RS-485 (-)

Page 7 of 26

2.2.2 Connection diagrams

S2

P2

S1

P1

L1

L2

L3

N

S2

P2

S1

P1

S2

P2

S1

P1

N

Alimentacion

Power Supply

S2

P2

S1

P1

L1

L2

L3

S2

P2

S1

P1

S2

P2

S1

P1

b

B

a

A

b

B

a

A

L1

L2

L3

b

B

a

A

b

B

a

A

S2

P2

S1

P1

S2

P2

S1

P1

Alimentacion

Power Supply

Figure 2. [4-wire / 3-wire - Low Voltage]

Figure 3. [2 voltage transformers -

3 current transformers]

Figure 4. [2 voltage transformers -

2 current transformers]

3 OPERATING MODE

When power is supplied to the CVM-MINI, the equipment will start its software interface
on the screen showing the version of the firmware and its setting. After a few seconds
the equipment is ready to operate and shows all available screens.
Once started the power analyzer will display the programmable electrical parameters
via the measurement Set-up. If there is no previous setting, the analyzer will display the
voltage between phase and neutral for L1, L12 and L1

Ci r c
ut or
UER1 .0 0

Figure 5. CVM-MINI

-

-

-

8 .8 .8 .8
8 .8 .8 .8

8.8.8.8.88

L1

L2

L3

THD

PF

OS

C

I

N

Pd

kvVArCh

Hz

Figure 6. CVM-MINI display - LCD SEGMENTS

Page 8 of 26

3.1 Keypad

The keypad comprises a total of seven silicon buttons which are used to set the
equipment. Some buttons have a rapid access function, i.e. entering the Set Up
interface is not required. Only the rapid access key needs to be pressed to run the
function.
Only three of the seven buttons may be pressed when the upper cover is down. This is
because the remaining five keys have a high risk factor if they were to be accidentally
pressed.

KEY

FUNCTION

resetN

Starting the equipment and clearing maximum and minimum values

for all instant parameters. Pressing the Reset

key is equivalent to

starting the equipment in the absence of voltage.

Nsetup

Using a long press, after starting the equipment (in the absence of

voltage, or after pressing the Reset key), Communication Set-up is
accessed. Here the

RS485 port parameters may be set and all

communication and measurement parameters may be blocked

using a password.
Using a long press, after starting the equipment (runtime mode),
Measurement Set-up

is accessed. Each and every parameter for

measurement may be changed.

clear

energy

Rapid access function; using a long press (pressed for 5 seconds),

all enabled energy counters are cleared (kW·h / kvarL·h / kvarC·h /

kVA·h in power consumption or consumption and generation).

max Pd

clear

Rapid access function; using a long press (pressed for 5 seconds),

the Power demand parameter previously set in Measurement Set-

up is cleared (Power demand) (kW III / kV·A III / A III / A ph).

Displaying all electrical variables by repeated presses, in runtime

mode. In Set-up

mode has the function of advancing the setting

screens.

min

Pressing in runtime mode, displays the minimum value of displayed

variable/s. In Set-up

mode it has the function of moving 1 digit

sideways.

max

Pressing in runtime mode, maximum variable values are displayed.

In Set-up

mode it has the function of increasing 1 digit cyclically

(from 0 to 9

), or selecting between two possible preset

configurations (for example: yes or no).

3.2 Default settings

The CVM-MINI Analyzer has a factory setting for display, communication and
measurement. For this reason and due to the fact that this default setting is not valid in
nearly all cases, the user must properly set-up the display, measurement and
communication in accordance with the installation’s requirements.

Page 9 of 26

3.2.1 Default display

Figure 7. Phase-neutral

voltage

(1)

Figure 8. Phase-phase voltage

(1)

503,2

570.9

550.8

L1

L2

L3

A

Figure 9. Current per phase

117,2
132,5
128,5

L1

L2

L3

kvV

Figure 10. Active power per

phase

7 .6

14.1
7 .6

L1

L2

L3

K VAr

Figure 11. Reactive power per

phase

117.9

133.4

128.5

L1

L2

L3

K VA

Figure 12. Apparent power per

phase

0.

99

0

.

9

9

0.99

L1

L2

L3

Pd

PF

Figure 13. Power factor per

phase

1 .3
1 .3
1 .0

L1

L2

L3

THD

V

Figure 14. % harmonic

distortion in voltage per phase

6 ,4
5 .0
4 ,9

L1

L2

L3

THD

A

Figure 15. % harmonic

distortion in current per phase

0.99

377.9

PF

kvV

Figure 16. PF III / Active power

III

0.99

29.2

PF

K VArL

Figure 17. PF III / Inductive

reactive power III

0.99
0

PF

K VArC

Figure 18. PF III / Capacitive

reactive power III

0.99
379,4

OS

C

K VA

Figure 19. Cos ϕ III / Apparent

power III

96,2

50.0
24,6oC

I

N

Hz

Figure 20. Neutral current /

Frequency / Temperature

375,5

Pd

kvV

Figure 21. Maximum demand

52349.1

kvV h

Figure 22. Imported / Consumed

active energy

1246.4

K VArLh

Figure 23. Imported / Consumed

inductive reactive energy

253.2

K VArCh

Figure 24. Imported / Consumed

capacitive reactive energy

52668.6

K VA h

Figure 25. Imported / Consumed

apparent energy

2349.1-

kvV h

Figure 26. Exported / Generated

active energy

- 1246.4

K VArLh

Figure 27. Exported / Generated

inductive reactive energy

- 253.2

K VArCh

Figure 28. Exported / Generated

capacitive reactive energy

- 2668.6

K VA h

Figure 29. Exported / Generated

apparent energy

(1)

The device display voltage as:

0 … 999 V :  … . V The dot indicates 1 decimal,
1000 … 9999 V :  …  V without decimal.
10000 … 99999 V : . … . V , the dot indicates a multiplying factor of 100.

389.5

390.1

V

229.5

229.8

230.1

L1

L2

L3

V

Page 10 of 26

3.2.2 LED Indicators

The CVM-MINI power analyzer is supplied with two LED indicators which give
information on the status of:

LED

FUNCTION

CPU

The slow flashing of the LED CPU shows that the equipment has

auxiliary power supply and is operative.
The rapid flashing of the LED CPU shows that there is an internal

problem with the start up software.

CO MM

The slow flashing of the COMM LED shows that the equipment is
communicating with a master peripheral via its RS485

communications port. The CVM-MINI power analyzer’s

communications protocol is Modbus RTU.

4 SETTING SET-UP

The CVM-MINI power analyzer has two very different Set-up configurations which can
set the parameters for all the measurement and communication settings.

Measurement set-up: All parameterisation of the equipment’s measurements are
carried out from this menu; voltage display (phase-neutral or phase-phase voltages
and current transformer ratios, setting the power demand meter, setting the start page,
backlight setting, returning the energy counters to zero and maximum demand, type of
harmonic distortion and setting the transistor outputs.

Communication set-up: All of the analyzer’s RS485 RTU Modbus communications are
parameterised from this set-up menu. Also the option to enter a password to protect
previous data settings in both Set-ups is possible from this menu.

4.1 Measurement Set-up

The measurement parameters for the CVM-MINI and all its functions are changed from
this menu (according to type); it may start the eight energy meters and reset maximum
demand (Pd), maximums and minimums recorded.
The analyzer does not store the setting changes until all of the setting has been
finished; the analyzer does not store the changes to the settings until the whole setting

program has been completed. If

resetN

is pressed before the end of the setting, the

setting entered is not stored in the memory.

 To access MEASUREMENT Set-Up the SETUP key has to be pressed with a

long press with the equipment started until setting mode is entered.

On entering setting mode, the message "SETUP loc", or as a default "SETUP unlo" is
displayed for a few seconds indicating that it is in setting and is informing of their status
(locked or unlocked respectively).

SETUP unlo: on entering setting mode it is possible to view and change the setting.
SETUP loc: on entering setting mode it is possible to view the parameterisation but it is
not possible to change it.

Page 11 of 26

4.1.1 Transformation Ratios

This menu accesses the voltage and current ratios and the voltage and current
primary and secondary may be changed.

4.1.1.1 Voltage primary value

The display shows ”set PriU” followed by six digits; these allow the setting of
the transformer voltage primary.
To write or change the voltage transformer primary value, repeatedly press the

max

key increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to change the remaining values.

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. To enter the data
and access the next setting process, press

.

set
Pr i U
000001

Figure 30. Voltage primary ratio

4.1.1.2 Voltage secondary value

The display shows ”set SecU” followed by three digits; these allow the setting of
the transformer voltage secondary.
To write or change the voltage transformer secondary value, repeatedly press
the

max

key increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to change the remaining values.

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. To enter the data
and access the next setting step, press

.

set
Sec U
001

Figure 31. Secondary voltage ratio

4.1.1.3 Current primary value

The display shows ”set PrIA” followed by five digits; these allow the setting of
the transformer current primary.
To write or change the current primary value, repeatedly press the

max

key
increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to change the remaining values.

Page 12 of 26

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. To enter the data
and access the next setting step, press

.

set
pr i a
00005

Figure 32. Current primary ratio

4.1.1.4 Current secondary value

Due to the fact that the CVM-MINI analyzer has a double scale for measuring
the current secondary, the secondary to be measured by the analyzer must be
set (I

N

/1A or IN /5A).

To select one of the two display measurement options, press the

max

key and

the two options will alternate. Once the required secondary of current has been
selected, press the

key to enter the data and access the next setting step.

set
Sec a
5

set
Sec a
1

Figure 33. Current secondary value IN /5A

Figure 34. Current secondary value IN /1A

4.1.2 Measurement in 2 or 4 quadrants

The CVM-MINI power analyzer may measure in two quadrants (power
consumption), or in four quadrants (power consumption and generation). If
measurements are only to be taken in power consumption, the two quadrant
option is recommended to avoid exported or generated energies being displayed
(-kW·h / -kvarL·h / -kvarC·h / -kVA·h).

0º

90º

180º

-90º

Capacitive

Capacitive

Inductive

Inductive

Page 13 of 26

To select one of the two display options (2 or 4 measurement quadrants), press
the

max

key and the two options will alternate. Once the required option is

selected, press the

key to enter the data and access the next setting step.

set
quad
4

set
quad
2

Figure 35. Measurement in 4 quadrants

Figure 36. Measurement in 2 quadrants

4.1.3 Power demand meter parameterisation

The CVM-MINI power demand meter is the integration in the time of a preset
instant parameter. The amplitude of this window is preset by the integration time.

4.1.3.1 Integrated parameter

The display shows ”Pd Code” followed by two digits which identify the code or
variable to be integrated as Maximum Demand.

To select one of the four integration parameters available, press the

max

key

and the four options will alternate in turn. Once the required option is selected,
press the

key to enter the data and access the next setting step.

Pd
Code
16

Figure 37. Active power III

Pd
Code
34

Figure 38. Apparent power III

Pd
Code
36

Figure 39. Current III

Pd
Code
a- ph

Figure 40. Current per phase

If “Pd Code 00” is selected, the instant integration of the power demand meter
will be deactivated.

4.1.3.2 Integration period

The Integration Period of the power demand meter may vary between a
minimum of 1 minute up to a maximum of 60 minutes.
To write or change the integration time value, repeatedly press the

max

key
increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to allow the remaining values to be changed.

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. To enter the data
and access the next setting step, press

.

Page 14 of 26

4.1.3.3 Clearing power demand meter value

To clear or save maximum demand, press the

max

key and the two options will

alternate. Once the required option is selected, press the

key to enter the

data and access the next setting step.

Cl r
pd
no

Cl r
pd
yes

Figure 41. No-clearing power demand meter value

Figure 42. Clearing power demand meter value

4.1.4 Display and backlight

4.1.4.1 Selection of screens to be displayed

Due to the fact that the CVM-MINI power analyzer has a large number of
default screens (as shown in section 3.2.1 Default display), the user has the
option of setting a personalised display by selecting screens to be displayed.

The display shows as default “def page yes”; the

max

key has to be pressed to

proceed to the personalised display option. The analyzer will show “def page
no” on the screen; to enter the data and proceed to this setting, press

.

Once the personalisation option has been entered, by using

key the
screens shown in section 3.2.1 Default display will be displayed in turn. By
using the

max

button, the screen to be displayed is selected. Select “yes” or

“no” respectively.

4.1.4.2 Selection of start page

In order to select the equipment’s preferred start up screen, repeatedly press
the

max

key up to display the screen to be selected. Once the required option

is selected, press the

key to enter the data and access the next setting

step.

set
init
page

L1

L2

L3

V

Figure 43. Select preferred page

Rotating function: Using the rotating display function, the Power analyzer
automatically displays every available screen for five seconds each.

The

must be used to enter the rotating display function when all electrical

parameters are flashing at the same time.

Page 15 of 26

4.1.4.3 Backlight (Backlit display)

The time in which the back lighting will be on after the last use is set by using
the keypad in this menu. The display is permanently on if 00 is set.

4.1.5 Clearing energy meter values

Clearing energy meters refers to the four consumed or imported energy meters.
To select clear these meters of kw·h, press the

max

key and the two options will

alternate. Once the required option is selected, press the

key to enter the

data and access the next setting step.

cl r
ener
no

cl r
ener
yes

Figure 44. No-clearing energy meters

Figure 45. Clearing energy meters

4.1.6 Setting THd or d

Harmonic distortion rate measurements may be made using two measurement
options: the effective value or the fundamental value.
To select one of the two calculation options, press the

max

key and the two

options will alternate. Once the required option is selected, press the

key to

enter the data and access the next setting step.

set
HAR
THD

set
HAR
D

Figure 46. Harmonic distortion value for the

effective value (RMS)

Figure 47. Harmonic distortion value for the

fundamental value

4.1.7 Digital output for the transistor (2)

Two types of setting may be made using the CVM-MINI’s digital transistor
outputs:

• Impulse per n kW·h or kvar·h (Energy): the value for the energy consumed

or generated may be set to generate an impulse.

• Alarm condition: associates a parameter to a digital output, setting a

maximum, minimum and delay (delay) for the trip condition.

In the event that no condition needs to be set, the 00 code is typed and entered
using the

key.

Page 16 of 26

4.1.7.1 Impulse per n KW·h or Kvar·h consumed or generated

In order to generate an impulse for consumed n kW·h, the energy meter to be
used has to be selected:

PARAMETER

SYMBOL

CODE

Active energy III

kW·h III

31

Inductive reactive energy III

KvarL·h III

32

Capacitive reactive energy III

KvarC·h III

33

Apparent energy III

kVA·h III

44

Active energy generated III

kW·h III (-)

45

Inductive reactive energy generated III

KvarL·h III (-)

46

Capacitive reactive energy generated III

KvarC·h III (-)

47

Apparent energy generated III

kVA·h III (-)

48

Once the energy code has been selected and entered using the key, the
watts·time per impulse is entered or as a default, kilowatts·time per impulse.

For entering the watts·time rate per impulse, repeatedly press the

max

key
increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to allow the remaining values to be changed.

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. To enter the data
and access the next setting step, press

.

Ou t 1
Pul s

000.000

Figure 48. Watts / impulse

4.1.7.2 Alarm condition

In order to link an alarm condition to an energy parameter, the code for the
selected parameter has to be entered. A list of electrical parameters and their
codes is shown below.

Page 17 of 26

PARAMETER

PHASE

SYMBOL

CODE

Phase-neutral voltage

L1

V 1

01

Current

L1

A 1

02

Active power

L1

kW 1

03

Reactive power L/C

L1

KvarL/C 1

04

Apparent power

L1

kV·A

38

Power factor

L1

PF 1

05

% THD V

L1

THD V1

25

% THD A

L1

THD A1

28

Phase-neutral voltage

L2

V 2

06

Current

L2

A 2

07

Active power

L2

kW 2

08

Reactive power L/C

L2

KvarL/C 2

09

Apparent power

L2

kV·A

39

Power factor

L2

PF 2

10

% THD V

L2

THD V2

26

% THD A

L2

THD A2

29

Phase-neutral voltage

L3

V 3

11

Current

L3

A 3

12

Active power

L3

kW 3

13

Reactive power L/C

L3

KvarL/C 3

14

Apparent power

L3

kV·A

40

Power factor

L3

PF 3

15

% THD V

L3

THD V3

27

% THD A

L3

THD A3

30

Temperature

-

ºC

41

PARAMETER

SYMBOL

CODE

PARAMETER

SYMBOL

CODE

Active power III

kW III

16

cos ϕ three-phase

cos ϕ

19

Inductive power III

kvarL III

17

Power factor III

PF III

20

Capacitive power III

kvarC III

18

Frequency

Hz

21

Active energy

kW·h

31

L1- L2 Voltage

V 12

22

Inductive reactive energy

Kvarh·L

32

L2- L3 Voltage

V 23

23

Capacit. reactive energy

Kvarh·C

33

L3- L1 Voltage

V 31

24

Apparent power III

kV·A III

34

Temperature

ºC

41

Maximum demand

Md (Pd)

35

Maximum demand L1

Md (Pd)

35*

Current III

AIII

36

Maximum demand L2

Md (Pd)

42*

Neutral current

IN

37

Maximum demand L3

Md (Pd)

43*

* Variables only valid if the Maximum Demand for current has been set per phase.

There are also some codes which refer to the three-phases at the same time
(Function OR). If one of these variables has been selected, the alarm will go off
when any of the three-phases, or all three at the same time, match the preset
conditions.

Page 18 of 26

PARAMETER

SYMBOL

CODE

Phase-neutral voltage

V1 / V2 / V3

90

Current

A1 / A2 / A3

91

Active power

kW1 / kW2 / kW3

92

Reactive power

Kvar1 / kvar2 / kvar3

93

Apparent power

kV·A1 / kV·A2 / kV·A3

98

Power factor

PF1 / PF2 / PF3

94

Phase-phase voltage

V12 / V23 / V31

95

% THD V

Thd1 / Thd2 / Thd3 V

96

% THD I

Thd1 / Thd2 / Thd3 A

97

Once the Alarm Condition code has been selected and the data entered using
the

key, the maximum value, minimum value and the delay in seconds

(hysteresis) for the alarm condition must be entered.

For entering the maximum, minimum and hysteresis values, repeatedly press
the

max

key increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to allow the remaining values to be changed.

When the last digit has been changed, press

min

to move back to the first

digit, allowing the previously set values to be changed again. In order to enter
one of the pieces of data, press the

key. Once the delay has been set,

press the

key entering the data and ending the setting.

Ou t 1
HI

000.0

Ou t 1
lo

000.0

Ou t 1
del a
0000

Figure 49. Maximum value

Figure 50. Minimum value

Figure 51. Hysteresis / Delay

Setting the number 2 digital output is shown on the display as “Out 2”. This
must be set by using the settings shown below.

MIN +

MAX +
max > min

ON OFF ON

======

0 Min Max

MIN +

MAX +
max < min

OFF ON OFF

==============

0 Max Min

MIN -- MAX +

ON OFF ON

=======

Min 0 Max

MIN + MAX --

OFF ON OFF

=============

Max 0 Min

MIN --

MAX -­max > min

ON OFF ON

=====

Min Max 0

MIN --

MAX -­max < min

OFF ON OFF

================

Max Min 0

Activating the outputs of the programmable values as Maximums and
Minimums.

Page 19 of 26

4.2 Communication Set-up

One or more CVM-MINI instruments may be connected to a computer or PLC in order
to automate a production process or an energy control system. As well as the usual
operation of each instrument, this system may centralize data at one single point; for
this reason the CVM-MINI has an RS-485 communication output.
If more than one instrument is connected to one single series line (RS-485), it is
necessary to assign to each a number or address (from 01 to 255) so that the central
computer or PLC sends the appropriate requests to these addresses for each
peripheral.

From communication Set-up, the CVM-MINI's communication parameters may be
displayed and/or changed; this may match these parameters to the requirements of the
system topologies and/or applications.
The analyzer does not store the setting changes until all of the setting has been
finished. If it is Reset before the end of the setting, the setting entered is not stored in
the memory.



To access the COMMUNICATION Set-up, first press the Reset key and

immediately press the Set-up key for a long time to enter a setting.

On entering setting mode the message "SETUP inic" appears for a few seconds,
informing the user that the equipment has entered communications display or setting
mode.

set
pr ot
bus

Figure 52. Protocol information

Using this information screen, the equipment is informing the user that the
Communication protocol via the RS-385 series port is standard MODBUS©.

To enter setting mode, press the

key.

4.2.1 Default settings

This menu option allows the automatic selection of a predefined communication
parameter; the default preset parameters are: Peripheral number 1, speed 9,600
bps, parity NO, data bits 8 and stop bit 1.

If a different preset communication setting is not required, “no” should be
selected.

To select one of the two options, just press the

max

key and the two options will

alternate. Once the required option is selected, press the

key to enter the

data and access the next setting step.

Page 20 of 26

set
Cdef
no

set
Cdef
yes

Figure 53. Non-standard communication

parameters

Figure 54. Predefined communication

parameters

4.2.2 Peripheral number

The peripheral number varies between 0 and 255 (0 and FF in hexadecimal).
To write or change the number of the peripheral, repeatedly press the

max

key
increasing the value of the digit which is flashing at the time.
When the required value is on the screen, move on to the following digit by
pressing

min

, to allow the remaining values to be changed.

When the last digit has been changed, press

min

to move back to the first digit,

allowing the previously set values to be changed again. To enter the data and
access the next setting step, press

.

set
nper
001

Figure 55. Peripheral number

4.2.3 Transmission speed

The transmission speed of RS485 communication bus may be: 1,200 bps, 2,400
bps, 4,800 bps, 9,600 bps or 19,200 bps. To select one of the transmission
speeds available, press the

max

key and the four options will alternate in turn.

Once the required option is selected, press the

key to enter the data and

access the next setting step.

set
baud
19200

Figure 56. Transmission speed

4.2.4 Parity

Parity may be selected, even or odd; to select the type of parity, press the

max

key and the three options will alternate in turn. Once the required option is
selected, press the

key to enter the data and access the next setting step.

Page 21 of 26

set
Pa r i
no

Figure 57. Parity

4.2.5 Data bits

7 or 8 data bits may be selected; to select the number of bits, press the

max

key

and the two options will alternate in turn. Once the required option is selected,
press the

key to enter the data and access the next setting step.

Figure 58. Data bits

4.2.6 Stop bits

1 or 2 stop bits may be selected; to select the number of bits, press the

max

key

and the two options will alternate in turn. Once the required option is selected,
press the

key to enter the data and access the next setting step.

set
st op
1

Figure 59. Stop bits

4.2.7 Protection of data Set-up using password

This menu option aims to protect the data set in Measurement Set-up.
As a default the equipment does NOT protect data with the “unlo” option. By

pressing the

key the data is entered and setting the equipment is finalised.

If, on the other hand, the parameters in Measurement Set-up are to be protected,
the option “Loc” has to be selected using the

max

key and then the key
pressed. The protection password as a default will always be 1234; any other
password code entered will be incorrect.

set
pass
0000

set
pass
1234

Figure 60. Password request to
protect Set-up data

Figure 61. Enter password to protect
Set-up data

For entering the password, repeatedly press the

max

key increasing the value of

the digit which is flashing at the time.

Page 22 of 26

When the required value is on the screen, move on to the following digit by
pressing

min

, to allow the remaining values to be changed.

When the last digit has been changed, press

min

to move back to the first digit,

allowing the previously set values to be changed again. In order to enter the
password, press the

key. Once the password has been set, press the

key entering the data and ending the setting.

In the event that the measurement SETUP parameters are to be changed again,
the equipment has to be first unlocked by the same procedure (position “unlo”),
and the appropriate changes are made.

5 APPENDIX – CVM-MINI-ITF-HAR-RS485-C2 SERIES

The CVM-MINI Series has an analyzer for the harmonic content up to the 15th
harmonic in voltage and current, showing the content on the LCD display. Therefore,
the HAR has a high number of display screens, where the value of the current and
voltage fundamental and the content of each harmonic may be seen.
The equipment’s display diagram is obtained by using the following procedure:

Figure 62. Display of Harmonic Content in Voltage and Current

Page 23 of 26

6 MODBUS RTU PROTOCOL

The CVM-MINI power analyzer communicates using the MODBUS© protocol. In the
MODBUS protocol the RTU (Remote terminal Unit) mode is used; each 8-bit per byte
in a message contains two 4-bits hexadecimal characters.

The format for each byte in RTU mode is:

Code 8 bit binary, hexadecimal 0-9, A-F.

2 hexadecimal characters contained in each 8-bit field in

the message.
Bits per byte 8 data bits.
Field Check-Error CRC Type (Cyclical Redundancy Check).

Modbus functions used:

Function 01 Reading the status of the relays.

Function 03 and 04 Reading n Words (16 bits-2 bytes). Function used for

reading the electrical parameters that the CVM-MINI is
measuring. All electrical parameters are long with 32 bits,
because of this two Words are required to request each
parameter.

(4 bytes - XX XX XX XX)

Function 05 Writing a relay.

6.1 MODBUS memory map

PARAMETER

SYMBOL

Instant

Maximum

Minimum

Units

Voltage phase

V L1

00-01

60-61

C0-C1

V x10

Current

A L1

02-03

62-63

C2-C3

mA

Active power

kW L1

04-05

64-65

C4-C5

w

Reactive power

Kvar L1

06-07

66-67

C6-C7

w

Apparent power

kV·A L1

4A-4B

AA-AB

10A-10B

Power factor

PF L1

08-09

68-69

C8-C9

x 100

Voltage phase

V L2

0A-0B

6A-6B

CA-CB

V x10

Current

A L2

0C-0D

6C-6D

CC-CD

mA

Active power

kW L2

0E-0F

6E-6F

CE-CF

w

Reactive power

Kvar L2

10-11

70-71

D0-D1

w

Apparent power

kV·A L2

4C-4D

AC-AD

10C-10D

w

Power factor

PF L2

12-13

72-73

D2-D3

x 100

Voltage phase

V L3

14-15

74-75

D4-D5

V x10

Current

A L3

16-17

76-77

D6-D7

mA

Active power

kW L3

18-19

78-79

D8-D9

W

Reactive power

Kvar L3

1A-1B

7A-7B

DA-DB

W

Apparent power

kV·A L3

4E-4F

AE-AF

10E-10F

w

Power factor

PF L3

1C-1D

7C-7D

DC-DD

x 100

Temperature

ºC

50-51

B0-B1

110-111

ºC x 10

Page 24 of 26

PARAMETER

SYMBOL

Instant

Maximum

Minimum

Units

Active power III

kW III

1E-1F

7E-7F

DE-DF

w

Inductive power III

KvarL III

20-21

80-81

E0-E1

w

Capacitive power III

KvarC III

22-23

82-83

E2-E3

w

Cos φ III

Cos φ III

24-25

84-85

E4-E5

x 100

Power factor III

PF III

26-27

86-87

E6-E7

x 100

Frequency

Hz

28-29

88-89

E8-E9

Hz x 10

Voltage line L1-L2

V12

2A-2B

8A-8B

EA-EB

V x10

Voltage line L2-L3

V23

2C-2D

8C-8D

EC-ED

V x10

Voltage line L3-L1

V31

2E-2F

8E-8F

EE-EF

V x10

% THD V L1

%THD VL1

30-31

90-91

F0-F1

% x 10

% THD V L2

%THD VL2

32-33

92-93

F2-F3

% x 10

% THD V L3

%THD VL3

34-35

94-95

F4-F5

% x 10

% THD A L1

%THD AL1

36-37

96-97

F6-F7

% x 10

% THD A L2

%THD AL2

38-39

98-98

F8-F9

% x 10

% THD A L3

%THD AL3

3A-3B

9A-9B

FA-FB

% x 10

Apparent power III

KvaIII

42-43

A2-A3

102-103

w

Maximum demand

Md (Pd)

44-45

A4-A5

104-105

w/VA/mA

Three-phase current (average)

A_AVG

46-47

A6-A7

106-107

mA

Neutral current

In

48-49

A8-A9

108-109

mA

Maximum demand A2

Md (Pd)

52-53

B2-B3

112-113

mA

Maximum demand A3

Md (Pd)

54-55

B4-B5

114-115

mA

PARAMETER

SYMBOL

Instant

Units

Active energy

kW·h III

3C-3D

w·h

Inductive reactive energy

kvarL·h III

3E-3F

w·h

Capacitive reactive energy

kvarC·h III

40-41

w·h

Apparent energy

kVA·h III

56-57

w·h

Active energy generated

kW·h III (-)

58-59

w·h

Inductive energy generated

kvarL·h III (-)

5A-5B

w·h

Capacitive energy generated

kvarC·h III (-)

5C-5D

w·h

Apparent energy generated

kVA·h III (-)

5E-5F

w·h

Page 25 of 26

* Recordings available in HAR model

MODBUS VARIABLES

PARAMETER

SYMBOL

L1

L2

L3

Units

Harmonic content in VOLTAGE

RMS current

V

2AE-2AF

2CC-2CD

2EA-2EB

Vx10

Harmonic 2

2B0-2B1

2CE-2CF

2EC-2ED

%

Harmonic 3

2B2-2B3

2D0-2D1

2EE-2EF

%

Harmonic 4

2B4-2B5

2D2-2D3

2F0-2F1

%

Harmonic 5

2B6-2B7

2D4-2D5

2F2-2F3

%

Harmonic 6

2B8-2B9

2D6-2D7

2F4-2F5

%

Harmonic 7

2BA-2BB

2D8-2D9

2F6-2F7

%

Harmonic 8

2BC-2BD

2DA-2DB

2F8-2F9

%

Harmonic 9

2BE-2BF

2DC-2DD

2FA-2FB

%

Harmonic 10

2C0-2C1

2DE-2DF

2FC-2FD

%

Harmonic 11

2C2-2C3

2E0-2E1

2FE-2FF

%

Harmonic 12

2C4-2C5

2E2-2E3

300-301

%

Harmonic 13

2C6-2C7

2E4-2E5

302-303

%

Harmonic 14

2C8-2C9

2E6-2E7

304-305

%

Harmonic 15

2CA-2CB

2E8-2E9

306-307

%

* Recordings available in HAR model

MODBUS VARIABLES

PARAMETER

SYMBOL

L1

L2

L3

Units

Harmonic content in CURRENT

RMS current

A

1F4-1F5

212-213

230-231

mA

Harmonic 2

1F6-1F7

214-215

232-233

%

Harmonic 3

1F8-1F9

216-217

234-235

%

Harmonic 4

1FA-1FB

218-219

236-237

%

Harmonic 5

1FC-1FD

21A-21B

238-239

%

Harmonic 6

1FE-1FF

21C-21D

23A-23B

%

Harmonic 7

200-201

21E-21F

23C-23D

%

Harmonic 8

202-203

220-221

23E-23F

%

Harmonic 9

204-205

222-223

240-241

%

Harmonic 10

206-207

224-225

242-243

%

Harmonic 11

208-209

226-227

244-245

%

Harmonic 12

20A-20B

228-229

246-247

%

Harmonic 13

20C-20D

22A-22B

248-249

%

Harmonic 14

20E-20F

22C-22D

24A-24B

%

Harmonic 15

210-211

22E-22F

24C-24D

%

Page 26 of 26

6.2 RS485 Connection diagram

A1

A

2

5

1

2

B ( - )

A ( + )

S GND

5

1

2

7

5

2

3

5

7

3

2

RS-485

RS-232

CONVERTIDOR

DB-9

RS-232 / RS-485

PC

7 TECHNICAL SERVICE

In the event of any equipment failure or any operational queries please contact the
technical service of CIRCUTOR S.A.
CIRCUTOR S.A. - After sales service.
Vial Sant Jordi, s/n
08232 - Viladecavalls.
Tel. – 902 449 459 (Spain) / [phone] ( Out of Spain)
E-mail - [e-mail]

RS-232 / RS-485
CONVERTER