Circutor CDP series Application Notes

Connection and configuration of a

CDP with DELTA RPI inverters

APPLICATION NOTES

(M028E0901-03-15A)

CDP

2 Application notes

CDP

Application notes 3

SAFETY PRECAUTIONS

Follow the warnings described in this manual with the symbols shown below.

DANGER

Warns of a risk, which could result in personal injury or material damage

.

ATTENTION

Indicates that special attention should be paid to a specific point.

If you must handle the unit for its ins tal l a ti on, s tar t-up or maintenance, the follow­ing should be taken into consideration:

Incorrect handling or installation of the unit may result in injury to personnel as well

as damage to the unit. In particular, handling with voltage applied may result in elec­tric shock, which may cause death or serious injury to personnel. Defective installa­tion or maintenance may also lead to the risk of fire.
Carefully read the manual prior to connecting the unit. Follow all installation and
maintenance instructions throughout the unit's working life. Pay special attention to
the installation standards of the National Electrical Code.

Consult the instruction manual before using the unit

In this manual, if the instructions marked with this symbol are not respected or fol­lowed correctly, it can result in injury or damage to the unit and /or installations

.

CIRCUTOR, SA reserves the right to modify features or the product manual without prior notification.

DISCLAIMER

CIRCUTOR, SA

reserves the right to make modifications to the device or the

unit specifications set out in this instruction manual without prior notice.

CIRCUTOR, SA

, on its web site, supplies its customers with the latest versions

of the device specifications and the most updated manuals.

www.circutor.com

CDP

4 Application notes

CONTENTS

SAFETY PRECAUTIONS .................................................................................................................... 3

DISCLAIMER ........................................................................................................................................ 3

CONTENTS .......................................................................................................................................... 4

LOG OF REVISIONS ........................................................................................................................... 5

1.- INTRODUCTION ............................................................................................................................. 6

2.- DELTA PRI M8A 8KW INVERTER ................................................................................................ 6

2.1.- COMMUNICATION CABLE ..........................................................................................................6

2.1.1. CONNECTION OF ONE INVERTER ...................................................................................7

2.1.2. CONNECTION OF SEVERAL INVERTERS .......................................................................7

2.2.- INVERTER COMMUNICATION CONFIGURATION .................................................................8

3.- CDP CONFIGURATION ................................................................................................................. 9

4.- COMMUNICATIONS TEST AND REGULATION ....................................................................... 11

4.1.- COMMUNICATIONS TEST ........................................................................................................11

4.2.- REGULATION TEST ....................................................................................................................12

5.- MAINTENANCE AND TECHNICAL SERVICE .......................................................................... 13

6.- GUARANTEE ................................................................................................................................ 13

CDP

Application notes 5

LOG OF REVISIONS

Table 1: Log of revisions.

Date

Revision

Description

08/15

M028E0901-03-15A

Original version

Note: The images of the units are solely for the purpose of illustration and may differ
from the original unit.

CDP

6 Application notes

1.- INTRODUCTION

DELTA offers several inverter models that can be managed via the CDP

Dynamic power controller.
For the CDP controller to be able to correctly manage the inverter,

communication between the two devices must be correct and both products
must be correctly programmed.

These application notes are not meant as a substitute for the CDP

or

inverter manuals, but rather as additional support for individuals who

need to interconnect the two devices.

Even so, the guides and manuals of each product should be consulted and each
company is responsible for providing technical support.

An inverter from the PRI family of inverters will be used as a model in these
application notes.

2.- DELTA PRI M8A 8kW INVERTER

The CDP and the inverter communicate via an RS-485 bus. This RS-485 bus
can connect up to 100 inverters, although the number of inverters in the vast
majority of domestic installations ranges from 1 to 3.

2.1.- COMMUNICATION CABLE

Functions of the communication cable terminals between the CDP and the
inverter:

Table 2: Functions of the communication cable terminals.

CDP

R2 channel communications

connector

INVERTER

Inverter ComCard

connector

Terminal

Description

Terminal

Description

1

A+ 3 DATA +

3

B- 4 DATA -

CDP

Application notes 7

The cable must be connected to the RS-485 port of the inverter, Figure 1.

Figure 1: Description of the inverter terminals.

2.1.1. CONNECTION OF ONE INVERTER

Figure 2 shows the connection between the CDP and a single inverter.

Figure 2: Connection between a CDP and o n e inverter.

2.1.2. CONNECTION OF SEVERAL INVERTERS

Figure 3 shows the connection between the CDP and several inverters.

Figure 3: Connection between a CDP and several inverters.

CDP

8 Application notes

The bus end terminal must always be connected to the last inverter of the RS­485 communication bus.
The bus end terminal is a resistor that is built in the communications card of the
inverter. To activate it, the switch must be configured in the ON position.

Figure 4: Bus end terminal.

2.2.- INVERTER COMMUNICATION CONFIGURATION

The following describes how to use the display to configure the inverter for
ensuring correct communication with the CDP.

The AC and DC sides of the inverter must be connected to the mains before

it can turn on.
Consult the inverter manual if you have any doubts.

The configuration of the DELTA inverter parameters is done using the 4 buttons
on the front panel of the unit. (Figure 5)

Figure 5: DELTA inverter keyboard.

The parameters to be configur ed ar e:

 Peripheral number ( Inverter ID), B y default, this parameter has the value

01. If you have several investors have to change the numbers of periph­eral to be different fro m each other.
In exceptional circumstances, if there are single-phase inverters in three­phase installations, they must be numbered as shown in Table 3:

CDP

Application notes 9

Table 3: Peripheral number in three-phase installations with single-phase
inverters.

Peripheral number

Inverter L1

Inverter L2

Inverter L3

1 to 84

85 to 168

169 to 254

 Insulation
 Country and regulation comply
 AC Connection

All parameters are in the same setup menu Inverter: Install settin g s.

To enter the Install settings menu must enter a password: 5555

Consult the manual for more information on how to configure the parameters.

3.- CDP CONFIGURATION

There is a configuration web site for the CDP where all the parameters of the
connected inverter have to be entered.

To do so, enter "/setup" at the end of the navigation bar where the CDP is
monitoring so that the following, for example, appears in the navigation bar:
“10.0.110.212/setup”

Next, the CDP configuration window will open (Figure 6).

Figure 6: CDP configuration web site.

CDP

10 Application notes

The most important inverter parameters that have to be configured in the CDP are
(Table 4):

Table 4: Parameters to be configured in the CDP.

Parameter

Description

Inverter type Inverter model. In this case select: DELTA

Inverter power

Total power to be controlled by the CDP.

Number of inverters

Number of inverters to control.

Phase

Architecture of the inverter connections

Consult the manual for more information on how to configure
the CDP.

When working with several three-phase inverters in cascade, the sum of the
power of all the inverters must be programmed in the Inverter Power variable in
the CDP so that the same regulation percentage is sent to each one.

When working wit h single-phase inverters in three-phase installations, the total
power of all the inverters must be programmed by selecting the "three single
phases" option in the "Phase" variable, and then entering the number of sets of
three single-phase inverters in the installation in the "Number of inverters"
variable.

Example: If there are six 2 kW single-phase inverters (two on the L1 phase, two
on the L2 phase and two on the L3 phase) the following configuration should be
entered:

• Inverter power: 1 200 0 W

• Number of inverters: 2

• Phase: three single phas es

However, if there are three 2 kW single-phase inverters (one inverter per phase)
the following configuration should be entered:

• Inverter power: 6 000 W

• Number of inverters: 1

• Phase: three single phases

CDP

Application notes 11

4.- COMMUNICATI ONS TEST AND REGULATION

4.1.- COMMUNICATIONS TEST

Check the communication between the inverter and the CDP, through the COM1
LED of the CDP:

 A flashing (or steady) LED means communication has been correctly

established.
The flashing rate is one flash per second (if there is one inverter) and 1/n
if there are several inverters (where "n" is the number of inverters
connected).

 If the COM1 LED is off , it means the CDP is not communicating with the

inverter. In this case check the communication cables and the inverter
communication configuration.

Correct communication between the CDP and the inverters connected to it can
be checked on the configuration web site. To do so, press the "Show system
status" button.

When this button is pressed, the CDP will scan the connected inverters and
indicate how many of the total number of inverters that the CDP has been
assigned to control have been detected.

The following image will appear if the communication is correct, Figure 7:

Figure 7: Checking communication between the CDP and the inverter.

CDP

12 Application notes

4.2.- REGULATION TEST

The following test can be performed to ensure the CDP is correctly performing
the regulation:

We assume a 3000W inverter generating 1400W.
Now we program the CDP indicating that the inverter power is 6000W. The CDP

will send the inverter a new setpoint so it can change its MPPT and the inverter
will reduce photovoltaic generation by 50%, generating 700W.

Do not forget to reprogram the CDP

with the initial inverter power value

after completing the test.

CDP

Application notes 13

5.- MAINTENANCE AND TECHNICAL SERVICE

In the case of any query in relation to unit operation or malfunction, please con­tact the

CIRCUTOR, SA

Technical Assistance Service.

Technical Assistance Service

Vial Sant Jordi, s/n 08232 - Viladecavalls (Barcelona)
Tel.: [phone] (Spain) / [phone] (outside of Spain)
email: [e-mail]

6.- GUARANTEE

CIRCUTOR guarantees its products against any manufacturing defect for two

years after the delivery of the unit.
CIRCUTOR will repair or replace any defective factory product returned during

the guarantee period.

• No r eturns will be accepted and no unit will be repaired or replaced if it is
not accompanied by a report indicating the defect detected or the reason

for the return.

•

The guarantee will be void if the unit has been improperly used or the
storage, installation and maintenance instructions listed in this manual
have not been followed. "Improper usage" is defined as any operating or

storage condition contrary to the National Electrical Code or that surpas-

sing the limits indicated in the technical and environmental features of

this manual.

•

CIRCUTOR

accepts no liability due to the possible damage to the unit or
other parts of the installation, nor will it cover any possible sanctions de­rived from a possible failure, improper installation or "improper usage" of
the unit. Consequently, this guarantee does not apply to failures occur­ring in the following cases:

- Overvoltages and/or electrical disturbances in the supply;

- Water, if the product does not have the appropriate IP classification;

- Poor ventilation and/or excessive temperatures;

- Improper installation and/or lack of maintenance;

- Buyer repairs or modifications without the manufacturer's authorisation.

CIRCUTOR, SA

Vial Sant Jordi, s/n
08232 -Viladecavalls (Barcelona)
Tel.: [phone] - Fax: [phone]

www.circutor.es [e-mail]