Mastervolt CS15TL RP, CS30TL RP, CS20TL RP Installation Manual

SunMaster

CS15TL RP / CS20TL RP / CS30TL RP

HIGH POWER GRID CONNECTED SOLAR INVERTER

UK | USERS AND INSTALLATION MANUAL | P01

NL | GEBRUIKERS- EN INSTALLATIEHANDLEIDING | P45

DE | BEDIENUNGS- UND INSTALLATIONSANLEITUNG | P93

FR | MANUEL UTILISATEURS ET D’INSTALLATION | P141

ES | MANUAL DEL USUARIO Y DE INSTALACIÓN | P189

IT | MANUALE DI USO E MANUTENZIONE | P237

10000000186/04

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OVERVIEW CS15TL RP/ CS20TL RP/ CS30TL RP

Figure 0-1: Overview of the SunMaster CS15TL RP / CS20TL RP / CS30TL RP

1. 3-phase 400V grid connection

2. Fan module (air inlet)

3. Communication module

4. External grounding (PE) facility

5. Multi-language display

6. Solar input 1

7. Solar input 2

8. Foot stands

9. Air outlets

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CONTENT

1 GENERAL INFORMATION 6

1.1 PRODUCT DESCRIPTION 6

1.2 USE OF THIS MANUAL 6

1.3 VALIDITY OF THIS MANUAL 6

1.4 SCOPE OF GUARANTEE 6

1.5 LIABILITY 6

1.6 CHANGES TO THE INVERTER 6

1.7 IDENTIFICATION LABEL 6

2 SAFETY GUIDELINES AND WARNINGS 7

2.1 WARNINGS AND SYMBOLS 7

2.2 USE FOR INTENDED PURPOSE 7

2.3 INSTALLATION, MAINTENANCE, REPAIR 7

2.4 WARNING OF SPECIAL DANGERS 7

3 HOW IT WORKS 8

3.1 PV MODULE, STRING, ARRAY AND COMBINER BOX 8

3.2 GRID CONNECTED INVERTER 8

3.3 NON-ISOLATED (TRANSFORMERLESS) 8

3.4 GRID INTERFACE 8

3.5 DISPLAY AND MONITORING 9

3.6 INGRESS PROTECTION AND OPTIMA COOLING 9

3.7 ANTI ISLANDING 9

3.8 STABIGRID FUNCTION 9

3.9 REACTIVE POWER 9

4 BEFORE YOU START 10

4.1 TRANSPORT, LIFTING AND STORAGE 10

4.2 INSTALLATION ENVIRONMENT 10

4.3 DC INPUT SPECIFICATIONS 10

4.4 SOLAR ARRAY CAPACITANCE 11

4.5 AC OUTPUT SPECIFICATIONS 12

4.6 LIGHTNING PROTECTION 12

5 GENERAL INSTALLATION AND COMMISSIONING 13

5.1 THINGS YOU NEED FOR INSTALLATION 13

5.2 UNPACKING THE CS INVERTER 13

5.3 MOUNTING THE INVERTER 14

5.4 AC 3-PHASE CONNECTOR 14

5.6 CONNECTING AND COMMISSIONING 15

6 OPERATION AND MAINTENANCE 16

6.1 GENERAL 16

6.2 MAINTENANCE 16

6.3 DE-COMMISSIONING 16

7 COMMUNICATION 17

7.1 COMMUNICATION MODULE 17

7.2 MASTERBUS NETWORK 17

7.3 MASTERBUS CONNECTORS 17

7.4 RS485 CONNECTORS 18

7.5 REMOTE MONITORING WITH RS485 18

7.6 PLANT TOTALS 18

7.7 ALARM CONTACTS 18

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8 DISPLAY 19

8.1 BUTTONS 19

8.2 THE HOME SCREEN 19

8.3 MAIN MENU 19

8.4 ENERGY TOTALS 19

8.5 PLANT TOTALS 20

8.6 MULTIMETER & STRINGMASTER 21

8.7 DATALOGGER 22

8.8 LOGBOOK 23

8.9 CONFIGURATION MENU 23

9 SPECIFIC DC CONFIGURATIONS 28

9.1 ISOLATION DETECTION 28

9.2 USING A STRINGMASTER PRO 28

9.3 DC SWITCH 28

10 SPECIFIC AC CONFIGURATIONS 29

10.1 SUPPORTED COUNTRIES 29

10.2 FUNCTION TEST FOR ITALIAN INSTALLATIONS 29

10.3 ACTIVE POWER MANAGEMENT 31

10.4 REACTIVE POWER EXPLANATION 32

10.5 REACTIVE POWER MANAGEMENT 32

10.6 USING AN ISOLATION TRANSFORMER 33

11 FUNCTIONAL GROUNDING 35

11.1 FUNCTIONAL GROUNDING 35

11.2 INSTALLATION REQUIREMENTS 35

11.3 INVERTER SETTINGS 35

11.4 MULTIPLE CS INVERTERS ON A
SINGLE TRANSFORMER 35

12 TROUBLE SHOOTING 36

12.1 LED INDICATION AND SOLUTION TABLE 36

13 TECHNICAL SPECIFICATIONS 37

13.1 OUTLINE DRAWINGS 38

14 ORDERING INFORMATION 39

15 CERTIFICATES 40

15.1 VDE0126-1-1 CERTIFICATE OF COMPLIANCE 40

15.2 RD 1699 COMPLIANCE 41

15.3 ENEL CERTIFICATE 42

15.4 BDEW CERTIFICATE 43

15.5 EC DECLARATION OF CONFORMITY 44

1 GENERAL INFORMATION

1.1 PRODUCT DESCRIPTION

The SunMaster CS15TL, CS20TL and CS30TL, further
referred to as “SunMaster CS” or “CS inverter” are grid
connected solar inverters. This inverter type is used to
convert photovoltaic power and feed this into a three phase
grid. The CS inverter is not suitable for stand-alone use
(i.e. use without utility grid).

1.2 USE OF THIS MANUAL

Copyright © 2013 Mastervolt. All rights reserved.
Reproduction, transfer, distribution or storage of part or all of
the contents in this document in any form without the prior
written permission of Mastervolt is prohibited.
This manual serves as a guideline for the safe and effective
use and installation of the SunMaster CS:

• For the installer this manual gives directions for the
installation, operation and commissioning.

• For the end user, this manual gives directions for the

operation, maintenance and possible correction of minor
malfunctions of the CS inverter.

• Every person who works with the apparatus should be

familiar with the contents of this manual, and must
carefully follow the instructions contained herein.

• Store the manual in an accessible place.

1.3 VALIDITY OF THIS MANUAL

This manual is valid for the following models:
Part no Model
131210150 SunMaster CS15TL RP
131210200 SunMaster CS20TL RP
131210300 SunMaster CS30TL RP

All the specifications, provisions and instructions contained
in this manual apply solely to the Mastervolt-delivered stand­ard version of the CS inverter.

1.4 SCOPE OF GUARANTEE

Mastervolt assures the product guarantee of the SunMaster
CS during five years after your purchase, on the condition
that all instructions and warnings given in this manual are

taken into account during installation and operation.

Among other things, this means that installation is carried
out by a qualified electrician, that installation and mainte­nance are executed according to the stated instructions and

correct working sequence, and that no changes or repairs

may have been performed on the CS inverter other than by
Mastervolt.
The warranty is limited to the costs of repair and/or replace­ment of the product by Mastervolt only. Costs for installation
labour or shipping of the defective parts are not covered by
this warranty.

For making an appeal on warranty you can contact your

supplier directly, stating your complaint, application, date of
purchase and part number / serial number.

1.5 LIABILITY

Mastervolt accepts no liability for:

• consequential damage due to use of the SunMaster CS;

• possible errors in the manuals and the results thereof.

1.6 CHANGES TO THE INVERTER

Changes to the SunMaster CS hardware are not allowed.
Changes to the SunMaster CS software/ firmware, except
for the settings made available to the user or installer, are not
allowed.

1.7 IDENTIFICATION LABEL

Figure 1-1

The identification label is positioned at the right side of the
CS inverter, see figure 1-1.

CAUTION!

Never remove the identification label.

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Part no : 131210200
Type : CS20TL RP
Input : 200-980Vdc, 1000Vdc Max
: MPP 350-800Vdc, 2x30A
Output : 400/230Vac, 3ph/N/PE, 50/60Hz,
: 32Amax, 20kVAnom

: cos φ 0.85 ind - 0.85 cap

VDE 0126-1-1

VDE AR-N-4105

ENEL GCR Ed. 2.1

G59/2-1
RD1663

SYNERGRID C10-11

Serial no: X402-0007

Made in PRC

IP65

CAT III 1000V

2 SAFETY GUIDELINES AND WARNINGS

2.1 WARNINGS AND SYMBOLS

Safety instructions and warnings are marked in this manual

by the following pictograms:

A procedure, circumstance, etc which
deserves extra attention.

CAUTION!

Special information, commands and
prohibitions in order to prevent damage.

WARNING

A WARNING refers to possible injury to
the user or installer or significant material
damage to the inverter if the installer / user
does not (carefully) follow the stated
procedures.

2.2 USE FOR INTENDED PURPOSE

The SunMaster CS is constructed as per the applicable
safety-technical guidelines. Use the CS inverter only in
installations that meet the following qualifications:

• in permanent installations;

• connected to a separate, grounded three phase AC group,
to which no other electrical equipment is connected;

• the electrical installation must meet the applicable

regulations and standards (must be carried out correctly)

and must be in a good condition;

• according to the technical specications as stated

in section 10.1.

WARNING

Never use the SunMaster CS in situations
where there is danger of gas or dust explosion
or potentially flammable products!

Use of the inverter other than as mentioned under section 2.2
is considered to be conflicting with the intended purpose.
In such cases, Mastervolt will not accept liability for any
damage or injury caused by the functioning or malfunctioning
of the inverter.

2.3 INSTALLATION, MAINTENANCE, REPAIR

WARNING

As dangerous voltages exist, only allow
installation, maintenance and repair of the
SunMaster CS to be carried out by
qualified electricians.

Connections and safety features must be executed according
to the locally applicable regulations.
In case of decommissioning and/or demounting follow the
instructions as stated in section 6.3.
If repairs or replacements are required, only use original
Mastervolt spare parts.

2.4 WARNING OF SPECIAL DANGERS
Two primary energy sources are present:

• solar panels (DC)

• utility grid (AC).

Switch off both sources before starting any

work on the installation. Block the switching

device against unintentional reconnection.
Verify the de-energizing of both DC and AC
connections using a suitable metering
instrument.

The voltages present at the grid and solar side
of the CS inverter are not safe to touch.

Make sure two persons are present when
working on the installation, at least until the

installation has been de-energized and verified
by a suitable metering instrument.

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3 HOW IT WORKS

The CS inverter is a grid connected photovoltaic power
inverter. It converts the high voltage DC power coming from
the photovoltaïc (PV) panels into AC power. The AC voltage

is fed back into the public utility grid.

A series of PV panels is called a string. One string can be
connected to one solar input of the inverter.

Figure 3-1: Schematic example of the CS inverter in a PV plant

3.1 PV MODULE, STRING, ARRAY AND COMBINER BOX

PhotoVoltaïc (PV) modules convert light into DC power. To
reduce cable losses, PV modules are connected in series: a
so-called “string”. A plane of PV modules is called a PV ar­ray and consists of multiple strings of the same length, being
connected in parallel. PV strings can be paralleled in a string
(combiner) box. These boxes may provide over current
protection and/ or over voltage (surge) protection, DC
isolating switch and string monitoring functionality.

3.2 GRID CONNECTED INVERTER

See figure 3-1.
The SunMaster CS main task is to convert DC power
produced by the PV modules into AC power and to feed it
back into the public utility grid. The SunMaster CS is not
suitable to be operated in stand-alone mode (independently
from the utility grid). The SunMaster CS has two
independent DC inputs. The PV arrays connected to these
inputs are each operated at their optimum voltage for an

optimal yield (MPP tracking).

3.3 NON-ISOLATED (TRANSFORMERLESS)

The SunMaster CS is a non-isolated (transformerless)
inverter. During operation, it couples the PV array potential to
the utility grid. An optional isolating transformer is available
for applications where galvanic isolation is required
(functional grounding, see chapter 11).

3.4 GRID INTERFACE

The DC PV input is inverted to an AC output: 230/400V AC
(3-Ph/N/PE) output in Wye (Y) configuration. For the PV input
operating voltage range refer to the specifications.
Anti- islanding is provided according to national standards.

The grid interface contains numerous safety mechanisms to
guarantee a level of safety better than an isolated inverter.
Redundant relays isolate the inverter from the grid in case
one of the following circuits detects a fault:
Isolation resistance detection: monitors PV array isolation
resistance.

• RCMU (residual current monitoring unit): monitors and
protects against ground leakage currents.

• DC injection: Monitors DC current injection into the grid.

• Grid voltage- and frequency monitoring

• Anti islanding protection: loss of utility detection

• Low voltage ride through

• Reactive Power

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DC power

Stringbox CS Inverter

AC power

3.5 DISPLAY AND MONITORING

3.5.1 CS inverter display

The CS inverter is equipped with a multi language display
for on site monitoring and control. Refer to chapter 8
Display for details.

3.5.2 Remote monitoring via RS485

The SunMaster CS supports RS485. This bus facilitates
remote monitoring via the RS485 network using a
DataControl datalogger. Monitoring can be accomplished via
internet or via a telephone connection. See also section 7.4.
If you opt for remote Monitoring & Control, please contact
your Mastervolt supplier.

3.5.3 Remote monitoring and control via MasterBus

The CS inverter can communicate with an optional
StringMaster and isolation transformer via the

MasterBus network.

3.6 INGRESS PROTECTION AND OPTIMA COOLING

The SunMaster CS consists of two separate compartments.
Rubber seals provide IP65 protection of the power
electronics against ingress of dust and humidity. The
cooling compartment provides IP44 protection and contains

only components resistant to dust and humidity. By keeping

the inverter cool, the intelligent Optima Cooling algorithm
helps to reduce losses and extend inverter life.

3.7 ANTI ISLANDING

The SunMaster CS is equipped with an anti-islanding system
that ensures instant disconnection in case of grid failure.
European countries maintain different regulations with
regard to anti-islanding devices and grid connection of
distributed generation in general. The common islanding
device switches off the inverter if the grid voltage or
frequency is out of range. The CS inverter is set to
local regulations by setting the country in the configurations
menu. This setting is password protected. The password is
available for installers on request.

CAUTION!

NEVER connect the CS inverter to a utility
grid other than specified, refer to section 4.5.

3.8 STABIGRID FUNCTION

SunMaster CS inverters have a high level of immunity to
voltage fluctuations caused by industrial loads. The inverter
stays online in case of minor grid fluctuations, thereby
supporting the utility network and increasing the daily
energy yield.

3.9 REACTIVE POWER

As per January 1st 2012, PV installations in Germany

capable of generating more than 3,68 kVA will be required to

provide reactive power.
Reactive power is used by the utility operators to control the
voltages in the power grid. As the share of power
generated by PV installations grows every year, it becomes
increasingly important for PV plants to support the grid similar
to conventional power plants.

The SunMaster CS “RP” version has been developed to
meet the new requirements according to the new VDE­AR-4105 norm. The specific features required in this norm
will
automatically be enabled when the installation country
“Germany” is selected:

• Active Power Derating; which can be self-controlled by

the inverter depending on the grid frequency, or set by
the grid operator via telecommand.

• Reactive Power Provision; which can be self controlled by

the inverter, depending on different variables (grid voltage
or inverter output power)

Active grid support functions limit the capacity of active
power and therefore should be taken into account when
designing a PV system. Mastervolt provides a “SysCalc”
design tool to assist customers with system design work.
It is available for free on www.mastervoltsolar.com. Refer to
section 10.4 for more information on Reactive Power.

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4 BEFORE YOU START

4.1 TRANSPORT, LIFTING AND STORAGE

Ensure adequate and secure packaging during

transportation of the CS inverter. Always use
suitable handling equipment for transportation.
More than two persons may be required to
hang the CS inverter to a wall, refer to local
safety standards.

The CS inverter is shipped in a wooden crate that can be

handled with a fork lift. In order to prevent damage, always

transport the CS inverter in its transportation crate. Minimum

two persons are required to unpack the CS inverter and to lift

it out of its box.

4.2 INSTALLATION ENVIRONMENT

The CS inverter is designed for both indoor and outdoor use,
protection degree is IP65.
Operating conditions:

• -20 to 60°C, relative humidity 4% to 100% condensing.

• Power derating at temperatures above 45 °C.

• Start-up at temperatures above -10 °C

CAUTION!

Do not install in aggressive environments like

ammonium, acids and salt air.

CAUTION!

Do not install in areas that are subject to the

risk of gas- or dust explosions.

4.2.1 For all installations

• If the CS inverter is installed in the immediate vicinity of
living areas, take into account that it can produce a certain

noise level when operating.

• Hang the CS vertically to a sufciently strong, solid wall,

no other angle other than straight up is allowed.

• Keeping at least 50 cm space around the CS inverter is

recommended, see fig. 4-1.

4.2.2 For indoor installations

• Maintain sufcient ventilation and enough distance around

each inverter to prevent build up of hot air.

4.2.3 For outdoor installations

• Prevent placement in direct sunlight as this warms up the

inverter, resulting in performance loss.

• Shield the inverter against direct rain when possible to

avoid corrosion.

• In humid atmospheres with large temperature differences,

moisture may gather behind the display screen. If this
persists, contact your Mastervolt supplier.

Figure 4-1: Mounting distance

4.3 DC INPUT SPECIFICATIONS

The PV installation to which the inverter is connected should
meet the following input specifications.

DC Input specifications per input
Model CS15TL RP CS20TL RP CS30TLRP

Absolute max. 1000VDC 1000VDC 1000VDC
Input Voltage
Operating 200VDC – 980VDC
voltage
Full power 350VDC – 350VDC – 460VDC –
voltage 800VDC 800VDC 800VDC
Max. input 23ADC 30ADC 34ADC
current

Maximum 9,5 kWp 12,5 kWp 19,0 kWp

PV power
Recommended 9,0 kWp 11,5 kWp 17,5 kWp
PV power
Maximum array 6 µF total for 2 inputs
capacitance
Max. PV ISC 30A 30A 34A

Never connect voltages higher than 1000V DC
to the inverter, as this will cause permanent
damage to the inverter.

The inverter will automatically limit the input
current and power to its specified rating. Excess
power will not be converted.

Air inlet Air inletAir inlet

Air outlet Air outletAir outlet

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4.3.1 Recommended cabling

All devices within the PV installation (panels, wiring, terminal

blocks, fuse holders, fuses, switches, etc.) must be rated for

the applicable maximum voltage and current ratings.
Use double isolated DC cabling for all connections.
A sufficiently large copper cross section will help reducing
the cable losses.

Current 10ADC 20 ADC 30ADC
Length

<10 m 2.5 mm2 4.0 mm2 6.0 mm2
10-20 m 4.0 mm2 6.0 mm2 10 mm2 *
>20 m >4.0 mm2 >6.0 mm2 * >10 mm2 *

*Cable adapter may be necessary for cross sections >6.0 mm

2

4.3.2 DC Connectors and switch

The SunMaster CS inverters use MC4 compatible DC
connectors with a 4 mm pin diameter.

Do not reverse the polarity of the PV
connections. The inverter will be permanently
damaged, and large short-circuit currents
may occur.

For safety reasons, the use of a suitable DC switch between
the PV modules and the inverter is recommended.
Depending on locally applicable regulations, such a switch
may be mandatory.

4.3.3 Parallel or independent operation

The SunMaster CS has two independently controlled inputs,
labelled “Input 1” and “Input 2”. These inputs can be used as
separate inputs or they can be connected in parallel depend­ing on the PV installation. The inverter will automatically detect

if the inputs have been paralleled. Make sure to divide the PV

power over the two inputs as equally as possible.

Parallel operation Independent operation

For uneven number of Per input different array
strings in the array. configuration or orientation
possible.
Required when applying Reduce losses in case of local
functional grounding. shadowing.
Refer to chapter 11.

To accommodate more than 1 PV string on each input, a DC
combiner box such as StringMaster should be used. Refer to
the StringMaster manual for specific installation instructions.
When more than three strings are paralleled in an array, they
must be fused. Use only DC rated fuses with appropriate
voltage and current ratings.
To avoid excessive losses, always make sure the string
voltages are equal to each other before paralleling them.
Never use different string lengths or different module types
in the same array.

Figure 4-2: Parallel and independent operation

Figure 4-3: Functional scheme StringMaster

4.4 SOLAR ARRAY CAPACITANCE

Every solar panel has a small parasitic (virtual) capacitance
between the photo-sensitive material and the external
structure. In the PV array all these capacitances add up to
one larger (virtual) capacitance.

If this capacitance is too large, it causes a high leakage

current to flow from the main electrical path to the external
structure. Such currents can be dangerous to humans and
may further degrade the performance of the installation.

< 3 strings > 3 strings

U U

Fuses

DC
Switch

Surge
protection

CS15TL
CS20TL
CS30TL

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< 3 strings

U

Inverter

DC Switch

Surge protection

PV array

The SunMaster CS is designed to operate with a solar ar­ray capacitance up to 6 µF. Larger array capacitances may

cause too large leakage currents, and can trip the internal

RCD protection.

If the RCD trips because of large PV array capacitance,
installing an isolation transformer may be necessary. Consult
your Mastervolt distributor for assistance.

4.5 AC OUTPUT SPECIFICATIONS

The SunMaster CS is intended for use in a permanent
installation, connected to a separately fused three-phase
AC branch to which no other equipment is connected. All
electrical connections must comply with locally applicable
installation codes and regulations.
The CS inverter is designed to operate in the following grid
conditions:

AC specifications
Model CS15TL RP CS20TL RP CS30TL RP

Nominal Power 15.000VA 20.000VA 30.000VA
Maximum Power 15.750VA 21.000VA 31.500VA
AC Voltage 3 Phase - 4 Wire Y
UGRID = 230VRMS +20%/–20%
Max. Phase
Current 3 x 24,2 ARMS 3 x 32,2 ARMS 3 x 46 ARMS
Max. Neutral
Current <1 ARMS
AC Frequency (50Hz) 45Hz – 55Hz
AC Frequency (60Hz) 55Hz – 65Hz
Max. Inrush Current 28.2A

Short circuit L-N 150A peak/12.9A RMS(3 cycl) during 8ms
Short circuit L-L 298A peak/21.8A RMS (3 cycl) during 4ms

4.5.1 Fusing

The SunMaster CS does not have internal fuses. External
fuses or circuit breakers are mandatory on every phase
according to the following ratings:

AC fuses

Model CS15TL RP CS20TL RP CS30TL RP

Fuse B
Characteristic 32A 40A 63A

Not installing a properly rated fuse (Icu > 2.1 kA) will pose a

safety hazard and will void the warranty of the inverter.

4.5.2 Wiring

The AC output is arranged in a 230/400V AC (3-Ph/N/PE)
Wye configuration. The neutral connection does not carry
any current, but must be connected to the inverter. The PE
connection must have a cross section as large as the largest
line conductor used, with a minimum of 4 mm2. For easy
installation, using a flexible cable type is recommended.
Refer to the locally applicable installation codes and
regulations for cable sizing.

AC wiring

Model CS15TL RP CS20TL RP CS30TL RP

Minimum cable
cross section 4 mm2 6 mm2 10 mm

2

Maximum AC
connector capacity 10 mm2 16 mm

2

Flexible cable
outer diameter 20 mm 25 mm

4.5.3 RCD

The SunMaster CS is equipped with an internal RCD, refer to
specifications for tripping values. If an external RCD is used,
Mastervolt advises to use A, B, or AC sensitive devices with
a trip current of at least 300 mA.

CAUTION!

If you use RCD’s in your installation, connect
maximum one CS inverter to an RCD

4.6 LIGHTNING PROTECTION

In a solar installation, precautions must be taken to avoid

damage from surges induced by lightning. The CS inverter
is equipped with class III (micro) protection devices against
over voltages on all DC, AC and communication
connections. Additional external surge protection and use of
flexible cable is strongly recommended. StringMaster string
boxes feature class II surge protectors and are available from
Mastervolt. When used, surge protectors must be installed
less than 10m away from the inverter.

Figure 4-4: Surge protection in a PV installation

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This chapter describes the general installation of one single
inverter. For example, specific installations with more than
one inverter and transformers are explained in chapter
9 and 10.

CAUTION

At least until all components have been verified
to be de-energized, 2 persons are required
during installation.

CAUTION!

Read chapters 2 and 4 prior to installation.

WARNING

High voltages (up to 1000 VDC) may exist on
the PV strings! Switch off the solar voltage and
verify that no dangerous voltage is present, be
fore starting the cable work. Use suitable
testing equipment

CAUTION!

Short circuiting, miswiring or reverse polarity
may lead to damage to the CS inverter, the
cabling and/or the terminal connections.
Follow all steps of the installation instructions
in order of succession as described.

5.1 THINGS YOU NEED FOR INSTALLATION

Make sure you have all the parts you need to install the
CS inverter:

• 1 CS inverter (included)

• 1 mounting bracket (included)

• 1 AC 3-phase output plug (included)

• String combiner box like the StringMaster or the

Switchmaster.

• 2 MasterBus terminating devices (included)

• This user’s and installation manual (included)

• M6 bolts and plugs to x the CS enclosure to the wall. Use

mounting materials that are suitable for the application.

• Tools for wall mounting

• Tools to connect, AC, DC and communication wiring

• A suitable multimeter

5.2 UNPACKING THE CS INVERTER

The CS inverter is packed in a plastic bag and delivered in a

special transport box, refer to figure 5-2.

1. Cut open the card board box with a sharp knife.

2. Remove manual and bracket and take away the cover.

3. Cut the tie wraps and lift the inverter from the box.
The inverter can be put on its four foot stands before
hanging it to the wall. Take care not to bend parts of
the enclosure.

Figure 5-1: Foot stands

After unpacking, check the contents for

possible damage. Do not use a damaged
product. If in doubt, contact your supplier.

Figure 5-2: Unpacking

5 GENERAL INSTALLATION AND COMMISSIONING

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5.3 MOUNTING THE INVERTER

Fix the CS inverter to the wall, starting with the mounting

bracket. See gure 5-3. Use suitable screws and plugs.

Figure 5-3: Drilling dimensions of bracket and display

After hanging the SunMaster CS to the bracket, secure the

enclosure to the wall using the fixing plate. See figure 5-4.

Figure 5-4: Fixing plate

Figure 5-5: Bottom view of the SunMaster CS connections

See figure 5-5.
AC connector: refer to section 5.4,
Communication module: refer to chapter 7,
PV input: refer to section 4.3.

5.4 AC 3-PHASE CONNECTOR

The AC connector has five wire terminals, figure 5-6 shows
the connector. Connect PE first (yellow-green). On the
CS30TL connector, the PE terminal is located at the bottom

when the two white markings at the other side of the

connector are facing upwards.

Protective Earth

1. Line 1 (L1)

2. Line 2 (L2)

3. Line 3 (L3)

4. Neutral (N)

Figure 5-6:
AC 3-phase connector for CS15TL RP and CS20TL RP (left) and for
CS30TL RP (right)

A ground stud has been provided, see figure 5-7.

Figure 5-7: Ground stud

5.5 DC CONNECTORS

The DC connectors on the SunMaster CS are compatible
with connectors of the MC 4 type.

105M6 4,13

188 7,41 270 10,6

32312,73

272 10,7

80 3,15

592,49 23,33

488 19,21

125 4,92

AC

Communication
module

PV input

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5.6 CONNECTING AND COMMISSIONING

To check the correct operation of the CS inverter,
commissioning should be carried out during daytime only.

Follow these steps to switch On the SunMaster CS:

1 Connect the earth cable to the ground stud.

2 Check AC and DC cabling and connectors.

3 Connect the AC cables.

4 Connect the DC cables.

5 If applicable, switch on the AC grid.

6 Move the DC switch (if applied) of the solar array
to the ON position.

5.6.1 Language and country selection

Until the CS inverter is configured in
accordance with the local regulations for grid
connection, it will stay in standby mode. This
means that no power will be converted.

Figure 5-8: Select language

1 Select the language, using the display. This setting is
found under Configuration/ Display settings/ Language.

Figure 5-9: Select country

2 Select the country, using the display. This setting is found
under Configuration/ Grid interface/ Country.

Figure 5-10: Set date and time

3 Set the day and time.

4 Check the PV input DC voltage. Check the AC voltage
at the grid side of the AC circuit breaker using the display

multimeter menu (see section 8.6). The AC voltages
should be:

L1 - N 230V AC +/- 10%
L2 - N 230V AC +/- 10%
L3 - N 230V AC +/- 10%

If DC and AC voltages are within range and
solar irradiation is sufficient, the CS inverter will
switch on automatically. This may take a
few minutes.

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6 OPERATION AND MAINTENANCE

This chapter describes the operation of one single inverter.

6.1 GENERAL

After installation and commissioning the CS inverter will
switch on automatically if solar irradiation is sufficient. The
CS inverter operates automatically: there is no need to
operate it manually. If the irradiation of the PV modules is
insufficient, for instance at night, the CS inverter switches
off automatically. The LCD screen however stays operational
as long as AC power is available. No live measurements are
available in this situation.

6.2 MAINTENANCE

Switch off the DC switch before any

maintenance takes place!

6.2.1 Cleaning

Cleaning of the CS inverter enclosure is not necessary under
normal circumstances. If cleaning is still preferable, use a
soft damp cloth to clean the enclosure of the CS inverter.
Never use any aggressive or abrasive cleaning agents. Use
of high pressure cleaning equipment is prohibited as it may
damage the sealing.

High Pressure cleaning of the Sumaster CS
is not allowed!

6.2.2 Fan module

Only remove the fan module when the CS
inverter is switched off.

The fan module (gure 6-1) needs checking and cleaning
every 12 months, in dusty environments checking is needed

more often. Unscrew the 4 hand screws as indicated.
Carefully move out the fan module, bottom first and unplug
the four fans before removing the module completely. If
necessary, clean the fans using compressed air.

Figure 6-1: Fan module with hand screws

6.2.3 Air outlet

The CS inverter is provided with wire mesh behind the air
outlets (fig. 6-2).

Figure 6-2: Removing the air outlets

Remove the two air outlets by unscrewing the two Phillips
screws on top. Clean if necessary.

6.2.4 Electrical connections

Have your electrical installation checked by a
qualified installer at least once a year. Defects such as
loose connections, burnt wiring etc. must be corrected
immediately.

6.3 DE-COMMISSIONING

If it is necessary to put the CS inverter out of operation,
follow the instructions in order of succession as
described below:

CAUTION!

Follow below mentioned instructions in order
of succession as described.

1 Switch Off the DC switch
2 Cut off the grid voltage by switching off the AC

circuit breaker

3 Release the AC connector
4 Release the DC connectors. A special tool may be needed
to release the DC connectors.
5 Disconnect the ground (PE) connection

Now the SunMaster CS can be demounted in a safe way.

CAUTION!

Never release the DC plugs during operation

of the CS inverter. A spark or an electric arc

may develop, in which case both plug and

socket of the CS inverter must be replaced.

CAUTION!

Be sure to disconnect all other cables before
disconnecting PE.

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7 COMMUNICATION

7.1 COMMUNICATION MODULE

The CS inverter is equipped with a detachable communication
module (drawer) for inserting the MasterBus and RS485 plugs.
It also facilitates mounting the alarm wiring.

Figure 7-1: Communication module

Install the communication wiring, see the steps below:

• Loosen the Phillips screws at both sides of the front plate

(see figure 7-1).

• Pull out the module, taking care not to damage the
connectors and components.

• Release glands and remove plugs where applicable.

• Insert the connectors and mount the alarm wiring.

See the label in figure 7-2 for more information.

Figure 7-2: Communication label

MasterBus connectors are similar to RS485
connectors! Wrong installation causes
communication failure.

7.2 MASTERBUS NETWORK

All devices that are suitable for MasterBus are marked by the

MasterBus symbol.

MasterBus is a fully decentralized data network for
communication between the different Mastervolt system

devices. The communication network is based on CAN-bus

which has proven a reliable bus-system. New devices can be

added to the existing network by just extending the network.
This gives the MasterBus network a high degree of exibility

for extended system configuration. Mastervolt also offers

several interfaces, making even non-MasterBus devices
suitable to operate in the MasterBus network.

CAUTION:

Never connect a non-MasterBus device to the
MasterBus network directly! This will void
warranty of all MasterBus devices connected.

7.3 MASTERBUS CONNECTORS

The CS inverter is equipped with 2 x 2 MasterBus connec-

tors (A and B) to install two MasterBus networks. Network A

is reserved for the string box or a transformer
connected to the CS inverter. The other network (B) is
reserved for communication and updating the inverter.

Figure 7-3: MasterBus network example

Proceed as follows to remount the communication module:

• Close any unused holes in the glands, using the
premounted caps.

• Insert communication module, using the guidance rails.

• Fix the Phillips screws at both sides of the front plate

(see figure 7-1).

For MasterBus connection of the CS-IT20
isolation transformer, refer to section 6.5.3.

Install the communication cables separated
from the AC and DC cables to prevent
communication loss caused by interference!

7.3.1 How to set up a communication network

Every device that is suitable for the RS 485 and MasterBus

network is equipped with two data ports. When two or more

devices are connected using these ports, together they form

a local data network.

NO
NC

COM

COMMUNICATION

A

Max 30V/1A

ALARM

CONTACT

!

B

485

485

Mastervolt

StringMaster

COM

NO
NC

!

!

COM

NO
NC

Max 30V/1A A B

485

485

485

485

Max 30V/1A

Mastervolt

StringMaster

USB

Interface

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Figure 7-4

7.4 RS485 CONNECTORS

The two connectors in the centre of the connection blockare

RS485 connectors. They can be used for connecting up to 20
CS inverters. They also connect your inverter to an optional

Datalogger. We recommend not to make a ringnetwork or
T-connections in your RS485 network. The maximum network

length is 1000m.

Connections between the devices are made by standard
straight UTP cables. Mastervolt can supply these cables.
These cables are also commonly available at computer
supply stores.

Figure 7-5

7.5 REMOTE MONITORING WITH RS485

Mastervolt provides several monitoring solutions like PC

software, dataloggers, remote monitoring and so on.
Consult www.mastervoltsolar.com for a comprehensive
overview of all possibilities.

Figure 7-6: RS485 connections

7.6 PLANT TOTALS

RS 485 connection of the inverters also enables display
of the plant totals. These are the power totals, calculated
by adding the individual powers of all connected inverters.
Refer to section 8.5.1.

7.7 ALARM CONTACTS

See figure 7-7, left part. The three alarm contacts (maximum
load 30V/1A) are Common (Com), Normally Open (NO) and
Normally Closed NC), see figure 7-7. Refer to section 8.9.5
for alarm contact settings.

Figure 7-7: Alarm contacts schematic example

Max 30V/1A

ALARM

CONTACT

+

_

NO
NC

COM

!

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8 DISPLAY

The SunMaster CS is fitted with a multi-lingual graphic
display allowing to view operational data and access all
setting parameters. It also provides access to plant data
and StringMaster Pro measurements when connected in the
installation.

8.1 BUTTONS

The CS inverter dislay has six buttons and a two-colour LED,
refer to figure 8-1.

Figure 8-1: Display, buttons and LED

8.2 THE HOME SCREEN

The default screen shown in the display is the Home Screen.
It is presented in figure 8-2. If no buttons have been pushed
for some time, the inverter automatically returns to this
screen. The Home Screen shows a summary of the actual
inverter status, warning and error messages and additional
information if available.

Figure 8-2: Home screen

a. Current date
b. Inverter ID
c. Current time

d. Today’s power generation
e. Inverter status, error messages and warnings
f. StringMaster status and messages or Plant
Totals information
g. Current output power
h. Energy generated today
In case an alarm occurs, it will appear on the screen.

8.3 MAIN MENU

Pushing the BACK button allows to switch back and forth

between the Home Screen and the Main Menu. The Main
Menu, shown in figure 8-3, is the starting point to access all
inverter information and settings.

Figure 8-3: Main menu

The Main Menu shows 6 icons. Select one of the icons using
the Navigation buttons and press OK to enter one of the
following menus:

1. Energy Totals. Total power generated since
first commissioning.

2. Plant Totals. Actual measurements and status info of all
inverters connected in the PV plant.

3. Multi Meter. Detailed measurements of this inverter and
the connected StringMaster.

4. Data Logger. History of power and energy generated by
this inverter.

5. Logbook. History of error and warning messages
for this inverter.

6. Config. Access to the settings menu.

The BACK button has the display return to the
Home Screen

8.4 ENERGY TOTALS

The Energy Totals screen (see figure 8-4) shows the total
power generated by this inverter since its commissioning
to date, the related financial savings and the CO2 emissions
that have been avoided with this renewable energy source.

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Figure 8-4: Energy totals

The BACK button has the display return to the Main Menu.

8.5 PLANT TOTALS

If multiple CS inverters have been connected to each other
via RS485 cables, the Plant Totals function screen will
collect information from all connected inverters and show
a summary on the display. Refer to section 7.6 for more
information on how to set up the PV plant with Plant Totals
functionality. The Plant Totals function is split into 4 different
screens, shown in figures below.

8.5.1 Plant Totals – Overview

The Plant Totals (PT) Overview screen shows a bar graph
summarizing the performance of the entire PV plant. Each
bar represents the actual* AC power output of one inverter.
In case a particular inverter has an error, an exclamation
symbol is shown instead of the power bar.
See figure 8-5. Below each bar, each inverter is referenced
with a number. This number corresponds with the inverter
number used in the next Plant Totals screens.
In the bottom of the screen, the actual* sum of all power
generated by the plant is shown. Pushing the BACK
button has the display return to the Home Screen.
Pushing the LEFT or RIGHT navigation button will scroll to
the previous/next Plant Totals screen.

* Due to delays in the communication line and a limited
update frequency, the power figures shown in the plant to­tals screens may differ from the information presented
on that particular inverter.

Figure 8-5: Plant Totals screens 1

Figure 8-6: Plant Totals screens 2

8.5.2 Plant Totals – Inverter Information

The performance of each inverter in the plant is further
detailed in the Inverter Info screens. By using the LEFT and
RIGHT Navigation buttons, the information table can be
shifted to the left or right. The following information is
available for each inverter:

Figure 8-7: Plant Totals Info 1

Figure 8-8: Plant Totals Info 2

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a. Inverter Number. This number relates to the power bar
shown in the PT Overview screen.
b. Inverter ID. A four-character code to identify each
inverter. This ID list is sorted alphabetically.
c. Inverter Error. If a particular inverter has an error, an
exclamation symbol is shown in the list.
d. Actual Power. The power currently generated by
that inverter.
e. Energy Generated. The energy generated today by
that inverter.
f. Relative Performance. The actual inverter power
relative to the rated PV panel capacity installed on
that inverter.
g. Serial Number. The serial number of that inverter.
When identical inverter IDs are used, the list is sorted on
the serial number.
h. Status Info. The current status of that inverter. If the
inverter has an error, concise information of the error
type is shown here.

8.5.3 Plant Totals – Setup

The fourth screen in the plant totals menu allows to set up
the Plant Totals configuration.

Figure 8-9: Plant Totals Setup

Select one of the options by using the UP and DOWN
Navigation buttons:

a. Search Inverter

If not all inverters are shown in the previous screens, select
this option and press OK to search the bus for new inverters.

b. Refresh

Select this option and press OK if the plant configuration has
been changed. (for example, when replacing an inverter).

c. Inverter ID

A four-character alphanumeric identification can be given
to each inverter in the plant. It is possible to use the same
ID multiple times. Select this option and press OK to adjust
the ID
The first character of the ID is now highlighted. Use the UP/
DOWN navigation buttons (push or hold down) to scroll
through all possible characters. When the desired character
is highlighted, use the LEFT/RIGHT navigation button to
select the next or previous character. Pressing OK will
save the ID to the inverter memory. BACK will cancel the
operation and returns to the settings menu.

d. PV power

The rated PV panel capacity installed on this particular
inverter. Setting this number will provide a more accurate
calculation of the relative inverter performance shown in the
PT Inverter Info screens. Select this option and press OK to
adjust this value. The first number will be highlighted. Use
the UP/DOWN/LEFT/RIGHT navigation buttons to adjust
each number and select the next/previous number. Pressing
OK will save the new value to the inverter memory. BACK will
cancel the operation and has the display return to the
settings menu.

8.6 MULTIMETER & STRINGMASTER

The Multimeter screen shows actual voltage, current and
power measurements for the inverter. If a StringMaster CS
2-6 SW Pro is connected to the inverter, current
measurements and health monitoring of each string are
provided as well.

Figure 8-10: Multimeter inputs/output

Figure 8-10 shows the general Multimeter screen. Voltage,
current and power measurements are shown for both DC in­puts. The output measurements show RMS voltage, current
and grid frequency on each phase.

The measurements shown in the Multimeter menus are sub­ject to metering inaccuracies and may not be correlated to
each other in time. These values can therefore not be used
for performance evaluations such as efficiency calculation

and power point tracker performance.

Each SunMaster CS inverter can communicate to one
StringMaster CS 2-6 SW Pro String Combiner Box using
the Masterbus protocol. Refer to sections 7.1 to 7.4 for

information on how to set up a MasterBus network between

the CS inverter and the StringMaster.

When connected, the inverter will automatically detect the
StringMaster and show the measurements in the Multimeter
screen shown in figure 8-11.

Use the LEFT/RIGHT navigation buttons to switch between
the Multimeter and StringMaster screens. The BACK button
will return the display to the Main Menu.

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Before showing accurate information, the StringMaster
measurements must be configured in the StringMaster
Settings menu. Refer to section 8.10.9 for additional
information.

Figure 8-11: Multimeter inputs per string

The StringMaster screen provides the following information:
a. StringMaster Status. Refer to the table below for
status information.
b. String Current. The current measured for each string.
c. String Info. Monitoring information for that particular
string. Refer to the table below for status information.
d. OVP Status. Trip status of the Surge Protectors inside
the StringMaster.
If the StringMaster is not connected or has an error, some or
all items may show three dashes (---) instead of a value. The
table below shows the Status and String info messages and
their meaning.

StringMaster Status Information

OK StringMaster is ON and operating normally
ALARM StringMaster has detected a problem in
the PV installation
ERROR StringMaster has an internal error or has
lost communication
Not Connected StringMaster is not connected
(and has not been connected previously)

StringMaster String Info

--- String is not configured, StringMaster has
an error or is not connected
OK String is healthy
OC String has exceeded maximum current
of 30A
NEG String current is reversed
LOW String current is below PV array
performance. See section 8.9.9 to
configure health monitoring

8.7 DATALOGGER

Every SunMaster CS inverter is fitted with an internal
Datalogger that allows the user to track the inverter
performance over the past. The datalogger can store energy
data for up to 10 years with adaptive resolution. With
adaptive resolution, energy data becomes more summarized

when looking further back in the past:

• Day-to-day energy shows a 10-minute accurate prole of

the energy generated for the past 30 days.

• Month-to-month energy shows the daily energy yield for

the past 12 months.

• Year-to-year energy shows the monthly energy yield for

the past 10 years.

Figure 8-12: Datalogger, day-to-day energy.

Figure 8-13: Datalogger, month–to-month energy.

Figure 8-14: Datalogger, year- to-year energy.

Use the buttons to navigate through the datalogger
information. LEFT/RIGHT will select the next/previous day,
month or year. UP will zoom in, increasing the resolution,
DOWN will zoom out, showing a larger timespan. The BACK
button will return the display to the Main Menu. In the bot­tom of the Datalogger screen, some statistics are shown:

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• Best hour/day/month. For example, how much energy

was generated at the best hour of the shown day.

• Day/Month/Year Energy. The total energy generated over

the time span shown.

• Savings. The amount of cost saved over the time
span shown.

8.8 LOGBOOK

The Logbook lists the 30 last errors and warnings that have

occurred in the inverter. Refer to figure 8-15.

Figure 8-15: Log book

Every notification is listed together with a time stamp (date
& time), and an error reference. The error reference can be
used for trouble shooting (see chapter 12) or getting
technical support. Use the UP/DOWN navigation buttons to
scroll through the list. The BACK button will return the dis­play to the Main Menu. For each selected notification a short
description, possible cause or possible solution is provided
in the comments box.

StringMaster errors and warnings are not

recorded in the LogBook.

8.9 CONFIGURATION MENU

The Configuration Menu provides access to all inverter
settings except Plant Totals. Note however that some
settings may be password protected and are not accessible
unless the Installer Code is provided.

Figure 8-16: Configuration screen

The Main Menu shows 8 icons as presented in figure 8-16.
Select one of the icons using the Navigation buttons and
press OK to enter one of the following menus:

1. Time and Date (see section 8.9.1)

2. Grid Interface (see section 8.9.2)

3. Display Settings (see section 8.9.3)

4. Device Info (see section 8.9.4)

5. Alarm Contact (see section 8.9.5)

6. Installer Code (see section 8.9.6)

7. Reset to Factory (see section 8.9.7)

8. StringMaster (see section 8.9.8)

9. Automatic string performance monitoring (see 8.9.9)

Pressing the BACK button has the display return to the
Main Menu. In every menu, each parameter or part of it can
be selected and modified using the four navigation buttons.
Pressing OK will confirm the selection or store the modified
value. The BACK button will cancel the current action or
return to upper menu level.

8.9.1 Date and time settings

The SunMaster CS inverter has an integrated real-time clock

that operates even with no AC or DC power applied. The
date and time settings can be adjusted in the menu shown in
figure 8-17.

Figure 8-17: How to set values on the LCD screen

The following parameters can be adjusted:

• Set date. Set the current date.

• Date view. Switch between DD/MM/YYYY and

MM/DD/YYYY

• Set time. Set the current time.

8.9.2 Grid Interface

The grid interface is locked with the installer password.
Under normal circumstances it is not necessary to modify
these settings. Every SunMaster CS inverter is pre­programmed with default country settings that comply with
the grid code requirements of the installation country.

Do not modify any of these settings unless you are a
qualified installer.

The Grid Interface Menu is split in 5 sub-menus shown in
figure 8-18.

Set date

14 / 04 / 2010

05

03

OK

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Figure 8-18: Grid Interface

• Country. The currently selected installation country. The
SunMaster CS supports all countries listed in chapter 10.

• Grid Settings. The grid protection settings for the
currently selected country

• Options. Isolation fault detection and transformer control

• Active Power Control. Options to allow controlling the

inverter active power output.

• Reactive Power Control. Options to allow controlling
the inverter reactive power output.

8.9.2.1 Grid Settings

For every country listed in the country table, Mastervolt has
prepared a default set of parameters to comply with the grid
code applicable for that country. These settings do not
need to be adjusted in any normal case. Only if absolutely
necessary, or if the installation country is not listed (yet),
the grid settings can be modified in this menu. If the grid
settings for a country are modified, the inverter will
automatically show “Custom” as the selected country.
Selecting the original country again will revert the inverter
to the default country settings.

Changing the grid settings should not be done
under normal circumstances. Without prior
written permission from Mastervolt, changing
these settings will void the warranty and could
void compliance to the national grid codes.

8.9.2.2 Options

The options menu controls the Insulation Fault detection and
the isolation transformer relay. Refer to figure 8-19.

Figure 8-19: Options

Insulation
a. Function. Describes how the insulation detection should

respond to a fault. There are several options:

On For normal installations. Inverter will shut down in case of
insulation failure. (Default Setting)
Neg GND For functional grounding on the Negative PV
Terminals. Inverter will shut down in case the
grounding is released.
Pos GND For functional grounding on the Positive PV
Terminals. Inverter will shut down in case the
grounding is released.
Input 2 NC Setting to operate the inverter with input 2 not
connected. Inverter will shut down in case of
insulation failure on Input 1.
Input 1 NC Setting to operate the inverter with input 1 not
connected. Inverter will shut down in case of
insulation failure on Input 2.
Off Ignore insulation failures.

Setting the Insulation Detection to OFF may present a safety
hazard in case the insulation fails. It is not recommended to
use this setting unless absolutely necessary.

b. R limit. This value sets the limit below which the inverter
will show an inverter failure. Depending on the inverter
model, the limits are different:
For detailed information about insulation detection levels,
please visit the Mastervolt website.

c. Input 1. In this screen, the last insulation measurement
results for input 1 are shown. Refer to section 9.1.

d. Input 2. In this screen, the last insulation measurement
results for input 2 are shown.

Isolation Transformer
e. Night Shutdown. Set this option to off (default) to disable

transformer control. When set to ON, the inverter will switch
the transformer off during the night to save energy.

8.9.2.3 Active Power Control

The CS inverter can reduce its active power output under
several circumstances, such as the grid frequency. The
active power control settings can be used to change the
inverter behaviour.

Figure 8-20: Active Power Control configuration

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8.9.2.4 DNO Power Control

For some PV installations, the local grid operator (Distribu-

tion Network Operator, DNO) may require the possibility to

reduce the power output of the PV plant by remote com­mands. In such case, a Telecontrol receiver must be in­stalled. Refer to section 10.3.1.

8.9.2.5 Frequency dependent Power Control

The SunMaster CS can reduce its output power
autonomously if the grid frequency exceeds the nominal
value. Refer to section 10.3.2.

8.9.2.6 Reactive Power Control

The CS inverter can produce reactive power with different
control mechanisms. The reactive power control settings
can be used to change the inverter behaviour. Refer to
section 10.5.

Figure 8-21: Reactive Power Control configuration

• Select control law

• Cos-phi control

• Constant cos-phi

• Q-U control

• Constant Q

8.9.2.7 Function test

This option only appears if you selected Country code Italy.
Refer to chapter 10.2

8.9.3 Display Settings

This menu allows to adjust the user preferences for the
Display. Refer to figure 8-22.

Figure 8-22: Display settings

a. Sleep Mode. Sleep mode switches off the backlight, and

returns the display to the Home Screen, when no buttons
are pressed for more than 5 minutes

b. Remuneration. Set this value to the price per kWh ap

plicable for the installation
c. Demo Mode. Shows samples for some measurements.

Table with display settings ranges

Display Settings

Setting Range
Brightness 1 – 5
Contrast 1 – 5
Sleep Mode On, Off
Language English, Dutch, Spanish,
Italian, French, German
Currency $ , €
Remuneration 0.00 – 9.99
Demo Mode On, Off

8.9.4 Device Info

These screens show the inverter model, serial number and
firmware revision numbers.

The commissioning date is the date when more than 10 kWh

has been produced or when more than 30 operating hours
have been accumulated.

Figure 8-23: Device information

8.9.5 Alarm Contact Settings

The alarm contact settings allow to configure the
potential-free alarm contact available in the communication
drawer. Refer to section 7.7 for connection examples
using the alarm contact.

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The following settings are available:

Alarm Contact Settings

Alarm On, Off
Select Event On, Insulation Error,
Solar OK, Grid Fault, Error
Alarm ON Delay 0 – 60 min
Alarm OFF Delay 0 – 60 min

8.9.6 Entering installer code

To unlock several settings, such as grid settings and String­Master configuration, the installer code must be entered in

this screen (see gure 8-24). If OK, the inverter unlocks (see

figure 8-25). The inverter logs out automatically after some
time. Contact Mastervolt to obtain your installer code.

Figure 8-24: Installer code

Figure 8-25: Settings unlocked

8.9.7 Reset to Factory settings

If the inverter is reset to the factory settings, all user settings
and datalogger information will be removed. If this menu is
selected, a warning screen appears. See figure 8-26.

Figure 8-26: Installer code

Pressing Continue confirms to reset the inverter to the
factory settings.

The installer password must be entered before
the inverter can be reset to factory defaults.

A confirmation screen will appear when all settings have
been reset.

8.9.8 StringMaster Settings

This section allows to set up the StringMaster monitoring
such, that it will suit the PV installation.

See the table below for the available settings.

StringMaster Settings
Info

StringMaster On, Off Switch to Off if the
Detect StringMaster is no
longer used.
Software StringMaster Firmware Revision
Serial Number StringMaster Serial Number

Input 1

String 1 … String 6 On, Off Enables monitoring for
this particular string

Deviation 0 – 100% See explanation below

Threshold 0,5A – 30A

Input 2

String 7 … String 12 On, Off Enables monitoring for
this particular string

Deviation 0 – 100% See explanation below

Threshold 0,5A – 30A

OVP

OVP1 Alarm On, Off Shows or ignores the
OVP Alarm
OVP2 Alarm On, Off

Settings

Alarm Message On, Off Shows or ignores
StringMaster errors in
the Home Screen and
on RS485
Alarm Delay 0 – 1440 min Sets the duration of
an error condition
before it is reported.

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8.9.9 Automatic String Performance Monitoring

Together with the StringMaster Pro, the CS inverter can
autonomously monitor the performance of each string
and compare it to the rest of the plant. If one string
underperforms (for example, because of dust deposits or
connector failures) compared to the others in that input,
the inverter will issue a warning on the home screen and
on both communications buses.

The performance warning is issued when:

1. The current of the failing string deviates more than [D]%

from the best performing string, AND

2. The current of the failing string is [T] Ampere less than
the best performing string, AND condition 1. and 2. are
true for at least [A] minutes.

[D] = String Deviation (Range: 0 – 100%)

[T] = String Threshold (Range: 0,5 – 30A)
[A] = Alarm Delay (Range: 0 – 1440 min)

Figure 8-27 shows the Performance Monitoring function
graphically.

Figure 8-27: Performance Low warning graph

15 A

15

OK

LOW

A

D (%)

0

Max String current

String current

input 1(2)

Offset

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9 SPECIFIC DC CONFIGURATIONS

This chapter describes specific features of special
installations and options using the CS inverter. It was
written to be an addition to chapter 5 General Installation
and Commissioning.

9.1 ISOLATION DETECTION

Every morning, before the SunMaster CS connects itself
to the grid and initiates power conversion, it measures the
isolation resistance of the PV installation. This measurement

is an important safety check and a mandatory procedure for

transformerless inverters.
Due to conflicting safety requirements in different European
grid and safety standards, it is possible that a healthy PV
installation still triggers the isolation protection mechanism
causing unwanted warnings and reducing the installation’s
energy yield. For more information about this topic, please
visit the Mastervolt website or contact your supplier.
In order to retain the flexibility of use with different PV
installations, Mastervolt CS inverters offer the option to
adjust the protection trip levels for the isolation measurement.
The following settings are available:

CS15TL RP CS20TL RP CS30TL RP
High Setting

Complies with

VDE 0126-1-1 1200 kΩ 1200 kΩ 1200 kΩ

Default Setting

Complies with

UL 1741 700 kΩ 550 kΩ 350 kΩ

Low Setting

Complies with
UL 1741 when
PV inputs

are paralleled 400 kΩ 300 kΩ 200 kΩ

The default settings in the inverter are safe. Do not change
the settings unless the installation requires to do so.

9.2 USING A STRINGMASTER PRO

9.2.1 DC Distribution

The CS inverter has two independent solar inputs. To
accommodate more than two strings, StringMaster and
Switchmaster string boxes are available.
Refer to the StringMaster manual for installation instructions.
To release the MultiContact connectors, use of the special
MultiContact tool is recommended.
When more than three strings are paralleled, they must be
fused. For fuse ratings refer to specifications of used fuse.
All strings connected to the same Solar-input should consist
of the same number of identical PV modules. Measure the
solar voltage for each input.
The calculated string voltage equals the open circuit voltage
(Uoc) per PV module (refer to the specifications of the PV
module), multiplied by the number of PV modules
in each string.

9.3 DC SWITCH

A DC switch may be mandatory in your country. It can be
purchased separately or integrated in a StringMaster
stringbox. Refer to section 9.3 for more information and to
chapter 14 for ordering information. The DC switch is
included in the optional Switch- and StringMasters.

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10 SPECIFIC AC CONFIGURATIONS

This chapter describes specific features of special installations
and options using the CS inverter. It was written to be an
addition to chapter 5 General Installation and Commissioning.

10.1 SUPPORTED COUNTRIES

In the next table, the selectable country codes are displayed.

COUNTRY

Netherlands
Belgium
France
Spain
Italy
Greece
Austria
Germany

Denmark

England
Ireland
Singapore
Taiwan
Korea
China
Custom

10.2 FUNCTION TEST FOR ITALIAN INSTALLATIONS

GENERAL

The Self Test Function is meant to check the upper and

lower limits of the AC voltage and AC frequency at which the
inverter will disconnect from the grid.

To enter the Self Test, enter the country selection menu in
the Grid Interface menu and choose Italy. In the Grid Inter­face, select the Self Test menu.

During the self test, next tests are possible:

• Uac Max (high off limit AC voltage);

• Uac Min (low off limit AC voltage);

• Fac Max (high off limit AC frequency);

• Fac Min (low off limit AC frequency).

After each test you have to press Confirm before the inverter
starts the reclosure count down and reconnects to the grid.

The standard reclosure time of 300 sec has
been reduced to shorten the testing time.
This is not an error.

The test accuracy is better than 1V/ 0.1Hz if grid voltage and
frequency are stable.

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Figure 10-1

Figure 10-2

Figure 10-3: Function test summary

Uo Max-TEST (Uac Min-TEST)

Figure 10-1 shows:

Measured value: = the actual grid voltage;

Setting: = the set maximum / minimum inverter
voltage limit
Max. Trip time = Maximum time for inverter to shut
down after tripping

During this test the high (low) voltage limit is changed with
Rate -11.5V/sec (+11.5V/sec) until it trips: it reaches the
actual grid voltage. The time to trip is called Test duration.
The time the inverter needs to shut down after tripping is
called the Trip Time.

Result OK if the calculated limit is within range.
Trip Time Measured time between tripping and inverter shut
down Calculated limit Calculated Uac Max (Uac Min), equals
Measured value plus (minus) Rate x Test duration

Fac Max-TEST (Fac Min-TEST)

Figure 10-2 shows:

Measured value: = the actual grid frequency;

Setting: = the set maximum / minimum inverter
frequency limit
Max. Trip time = Maximum time for inverter to shut
down after tripping

During this test the high (low) frequency limit is changed with
Rate -0.05Hz/sec (+0.05Hz/sec) until it trips: it reaches the
actual grid frequency. The time to trip is called Test duration.
The time the inverter needs to shut down after tripping is
called the Measured Trip Time.

Result OK if the calculated limit is within range.
Measured Trip Time Time between tripping and inverter shut
downCalculated limit Calculated Fac Max (Fac Min), equals
Measured value plus (minus) Rate x Test duration

Figure 10-4: Function test selection

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10.3 ACTIVE POWER MANAGEMENT

This section describes all types of power management
available on the SunMaster CS inverter.

10.3.1 Power management by Telecontrol

For some PV installations, the local grid operator (Distribution

Network Operator, DNO) may require the possibility to reduce

the power output of the PV plant by remote commands. In
such case, a Telecontrol receiver must be installed.
The SunMaster CS can respond to the power commands
when a Data Control Premium II or Data Control Pro is
connected to the inverter by RS485. A single datalogger
can control up to 20 inverters at the same time. Contact your
Mastervolt supplier for more information.
In case the DNO sends a Power Management request to
the plant, the CS inverter dislay will show the current
reduction value in the display in the Home Screen.
Refer to figure 10-5.

Figure 10-5: Home screen, the Warning can be a power reduction

10.3.2 Frequency dependent power control

The SunMaster CS can reduce its output power
autonomously if the grid frequency exceeds the nominal
value. The inverter has two available control laws.

1. Control Law 1 (compliant to VDE-AR-4105)

2. Control Law 2 (compliant to BDEW)

Figure 10-6: Control Law 1 (compliant to VDE-AR-4105)

The inverter will start reducing the output power when the
grid frequency exceeds the fstart value. The power reduction
(Gradient) is defined as a percentage of actual output power
per hertz, according to the following formula:

∆P = Gradient*fstart - factual
Pm is the inverter output power when fstart was exceeded
Gradient is the relative power reduction per hertz
fstart is the control trip frequency
factual is the actual measured grid frequency

• When the grid frequency rises above fstart, the inverter

memorizes the actual output power generated at that
moment. The memorized power is stored as Pm.

• For any grid frequency above fstart, the output power is

reduced with the defined Gradient.

• When the grid frequency drops below fstart, the inverter

will return to full power operation

Figure 10-7: Control Law 2 (compliant to BDEW)

Refer to figure 10-7. The inverter will start reducing the
output power when the grid frequency exceeds the fstart
value. When the grid frequency is reduced, the inverter will
clamp the output power to the lowest value achieved, until
the frequency has dropped below the predefined recovery
frequency frecover.

Available Parameters

A single set of parameters are available to fine-tune the
inverter behavior for both control laws. If the VDE compliant
control law is selected, frecover parameter is ignored. The
Ramp-Up parameter specifies the speed at which the inverter

0

P

m

f [Hz]

P

f

start

P

G r a d i e n t : % / H z

f

recover

0

P

m

f [Hz]

P

f

start

P

G r a d i e n t : % / H z

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10.4 REACTIVE POWER EXPLANATION

A growing share of power coming from PV installations results

in a demand to keep the utility grid stable. Reactive power is an

inverter function which helps to stabilize the utility grid. It
enables adaptation of the power factor to reduce output power
when there is more supply than demand.
SunMaster CS inverters can generate Reactive power as
required by the VDE-AR-N 4105 regulations in Germany, which
will be introduced 1 September 2011. These regulations state
the following reactive power requirements:

Installation size Power factor

<3.68 kVA 1.00

3.68-13.8 kVA 0.95
>13.8 kVA 0.90

A power factor of 0.9 means the power fed back is reduced by
10%. In other words: there is 90% active (useful) power and
10% reactive (useless) power. In this case, a 30 kVA inverter
feeds 27 kW back into the grid.

Control for the reactive output can be adjusted to meet local
demands. To calculate the effect of reactive power on the
sizing of the installation, please download Mastervolts system
calculator SysCalc which is available for free on
www.mastervoltsolar.com. SysCalc takes into account the
effects of reactive power on cable losses. Mastervolt inverters,
if set to German country settings, will select default reactive
power settings. For adjustment of these settings, refer to
chapter 8.

10.5 REACTIVE POWER MANAGEMENT

Reactive power is needed in some installations to support
the local grid quality. A default configuration is programmed
for each installation country that is compliant to the applica­ble national grid codes. In some cases, the local network
operator (DNO) may require to adjust the inverter settings.

The SunMaster CS supports four different control laws, out
of which one can be selected.

If the inverter is operating at an output power
below 20% of its nominal rating, the Reactive
Power output may deviate from the provided
settings. This is normal behavior for the
CS inverter.

The inverter can be set up to reduce the reactive power in
four different ways:

1. Cos phi – P

2. Q – U

3. Constant cos-phi

4. Constant Q

10.5.1 Power dependent power factor control

This control law (cos phi – P control) sets the phase angle
between voltage and current as a function of the inverter
output power. It is the default control loop selected for
operation in Germany. Figure 10-8 shows an example
demonstrating the available parameters.

Figure 10-8: Cos phi – P Control

The user (installer) can provide 4 independent setpoints:

Name Range Resolution Default

cos phi P1 0,90 ind -> 0,90 cap* 0,01 1,00
(Upper Limit)
cos phi P2 0,90 ind -> 0,90 cap* 0,01 0,95 ind
(Lower Limit)
Power Setpoint 1 0% -> 100% P/ Pnom 1% 50%
(P1)
Power Setpoint 2 0% -> 100% P/ Pnom 1% 100%
(P2)

cap = Capacitive generator
(i.e. over-excited generator, current lags voltage)
ind = Inductive generator
(i.e. under-excited generator, current leads voltage)

P2 cannot be set to a value equal to or below P1 (P1 < P2);

The Upper Limit cannot be set to a value below the Lower
Limit.

will increase its output power after the frequency has
recovered, or after a grid fault has been cleared.
4 independent setpoints are available:

Name Range Resolution Default

fstart 50 – 55 Hz / 60 – 65 Hz 0,01 Hz 50,20 Hz
frecover 50 – 55 Hz / 60 – 65 Hz 0,01 Hz 50,05 Hz

Gradient 0% _ 100% P/Pm/Hz 1% 40%
Ramp-Up 0% _ 6000%

P/Prated/min 10% 10%
Mode VDE / BDEW VDE

fstart can only be set to a value higher than fhigh,off (fhigh,off > fstart)

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10.5.2 Voltage dependent Q control

This control law (Q – U control) produces an amount of
reactive power based on the actual grid voltage. Figure 10-9
shows an example demonstrating the available parameters.

Figure 10-9: Q – U control

Name Range Resolution Default

Value

Upper Limit 53%ind–53%cap 1% 44% cap
Lower Limit 53%ind–53%cap 1% 44% ind

VMIN 184 – 264 V 0,1 V 184 V
VMAX 184 – 264 V 0,1 V 253 V
V1 184 – 264 V 0,1 V 230 V
V2 184 – 264 V 0,1 V 230 V
Hysteresis 0 – 100 V 0,1 V 0 V

The reactive power values for the Upper and Lower Limits
are defines as a percentage of the nominal apparent inverter
power (Snominal). For example, a value of 20% cap
programmed in a CS20TL inverter, will correspond to

20.000VA * 20% = 4000var

Removing the hysteresis is possible by programming the
value to 0V. In case a hysteresis is provided, the V1 and V2
points will be centered inside width of the hysteresis. In
figures 10-10 and 10-11, two possible configurations are
shown with different parameters:

Figure 10-10: Example with V1 = V2 and Hysteresis > 0V

Figure 10-11: Example with Hysteresis = 0

Refer to www.mastervoltsolar.com for more information
about reactive power.

10.5.3 Constant Power Factor output

It is possible to fix the inverter phase angle regardless of the
output power by selecting the “Constant cos phi” control
law. Any value between 0,90 ind and 0,90 cap can be se­lected.

10.5.4 Constant Reactive Power output

The “Constant Q” control law sets the inverter to generate
a fixed amount of reactive power regardless of the inverter

output power or the grid voltage. Like in the Q-U control law,

the reactive power setting is defined as a percentage of the
nominal apparent inverter power (Snominal).

10.5.5 Response Delay

The Response Delay determines how fast the inverter should
respond to changes in the output power or in the grid volt­age, if the “cos phi – P control” or “Q – U control” laws are

used. Al larger Response Delay setting will make the inverter

respond slower.

10.6 USING AN ISOLATION TRANSFORMER

An isolation transformer may be necessary for several reasons:

1. To allow functional grounding of the PV array.

2. High Solar Array capacitance

3. Local regulations

10.6.1 Y-configuration

The secondary windings (on the inverter side) of the isolation
transformer must be in Y (wye, star) configuration with a
neutral connection available at the star point of the three
windings. Refer to figure 10-12 for a simplified installation
schematic.

Figure 10-12: 3-ph isolation transformer in Y-configuration

Lower

Limit

Q/S

nom

Upper

Limit

V

MIN

V

MAX

Inductive

Capacitive

Hysteresis

V1

V2

Lower

Limit

Q/S

nom

V

AC

Upper

Limit

V

MIN

V

MAX

Inductive

Capacitive

V1 = V2

Lower

Limit

Q/ S

nom

V

AC

Upper

Limit

V

MIN

V

MAX

Inductive

Capacitive

V1

V 2

NL1 L2

L3

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10.6.2 PV array earthing

If the PV array is not grounded and local regulations require
this, it is allowed to ground the neutral at the transformer

side (TN network)

If the PV array is functionally earthed it is recommended
to use a separate transformer for each inverter, or to use a
transformer with multiple isolated windings.

10.6.3 CS-IT20 transformers

The CS-IT20 isolation transformer is designed to provide
the necessary isolation for one CS20 inverter. It features a
MasterBus controlled relay to switch off during the night,
reducing night-time losses to a minimum

Figure 10-13 shows how the MasterBus network can be in­stalled to a CS-IT20 transformer. MasterBus supports cable
lengths up to 100m.

When installed, the CS inverter will automatically detect the
transformer relay and load all appropriate settings. No user
configuration is necessary to set up the transformer control.

If desired, the transformer control can be switched off in the
display menu. Refer to section 8.9.2.2 for instructions.

10.6.4 MasterBus connections

The CS-IT20 transformer is equipped with a MasterBus relay

for MasterBus controlled switching. Network A is used for

this purpose. Refer to figure 5-7 and chapter 5.

Figure 10-13: MasterBus network A: CS-IT20, CS20TL, CS30TL,
StringMaster Pro

485

485

A B

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11 FUNCTIONAL GROUNDING

11.1 FUNCTIONAL GROUNDING

During normal operation, the CS inverter will balance the DC
voltage on its terminals around the PE potential. This means
the negative DC terminal will operate on a negative poten­tial with respect to PE and vice versa for the positive DC
terminal. Certain PV module types cannot withstand this bal­anced operation and may suffer accelerated degradation in
case the array is left floating. In such a case, one of the DC
terminals of the PV array must be grounded. This is called
Functional Grounding. For more information, refer to www.
mastervoltsolar.com.

The SunMaster CS inverter cannot operate
when functionally grounded, unless an isolation
transformer is used.

Protective grounding is not the same as
functional grounding. The mechanical structure
of the PV array should always be grounded.
This also applies for the AC side of the CS
inverter (see section 5.4)

11.2 INSTALLATION REQUIREMENTS

The CS inverter can support operation with functional
grounding if the following conditions are satisfied:

• A suitable isolating power transformer such as
CS-IT20 is installed.

• The secondary neutral terminal of the isolation
transformer is NOT grounded.

• Both DC inputs are paralleled.

• The inverter PE terminals are always grounded.

Either the Positive or Negative DC terminal can be
grounded. Refer to figure 11-2 for a SIMPLIFIED
installation diagram.

11.3 INVERTER SETTINGS

When the installation is complete, the inverter can be
commissioned according to the procedure described in
section 5.6. After the initial start-up and first configuration
steps, the inverter will report an insulation failure on the
DC terminals. The inverter will not switch on.

1. On the CS inverter display, go to Configuration Page.

2. Enter the Installer Code.

3. Go to the Grid interface menu and select Options

4. The Options menu will show the isolation detection
settings. Refer to section 8.9.2.3 for details.

Figure 11-1: Isolation detection

5. Set the Function parameter to “Pos GND” or “Neg GND”
depending on which DC terminal has been grounded.
Push the OK button to confirm.

6. Adjust the Rlimit value to the lowest setting. Push the OK
button to confirm.

7. The settings are now saved in the inverter memory. You
can return to the Home Screen with the BACK button.

The inverter will now start up.

During every start-up from now on, the inverter will check

the integrity of the functional grounding.
If grounding has failed and the isolation resistance of the PV
array is higher than the Rlimit threshold value, the inverter
will issue an error message and remain in stand-by mode.

Figure 11-2: PE at DC input isolation transformer

11.4 MULTIPLE CS INVERTERS ON A
SINGLE TRANSFORMER

If more than one inverter is connected to one transformer,
the ground connections may cause the insulation detection
to trip.
It is not recommended to install multiple CS inverters on a
single transformer. Ground loops may occur and trigger the
RCD protection in the inverter. Installations with multiple CS
inverters requiring functional grounding can best apply a
separate transformer for each inverter. Alternatively, a
transformer with multiple isolated windings may be used.

DC

+

-

+

-

PE

CS 30 TL

DC

AC

CS-IT20

N AC 3-P

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EN / SunMaster CS15TL RP / CS20TL RP / CS30TL RP

12 TROUBLE SHOOTING

12.1 LED INDICATION AND SOLUTION TABLE

Fast blink= 2 blinks per second, slow blink = 1 blink per second

LED indication Display indication Description What to do

No LED function

Red, fast blink

Red

Red

Red

Grid faults

Hardware faults

Ambient faults

Normal operation

StringMaster faults

Red AC freq high, low Grid frequency out of range If this happens often, contact installer.
Red AC phase jump Disconnect: fast frequency fluctuations If often, contact your installer.
Red AC quality Disconnect due to bad grid quality If often, contact your installer.

Red No grid No grid available Check the fuses.

Red AC volt low, high Grid voltage low, high If often, contact your installer.
Red TR AC volt high Transient AC voltage high If often, contact your installer.
Red SL AC volt high Grid voltage high for 10 minutes If often, contact your installer.
Red A C Phase Balance Grid phase balance out of range If often, contact your installer.

Red, slow blink Reclosure Time Reclosure time counting Nothing, reclosure may take 5 minutes.

White ON Normal operation

HW Error Refer to StringMaster manual.

OC Over current: Installation error Check cabling and scheme.
NEG Reverse polarisation Check string polarisation.

Warning. Refer to section 8.7 for warning decriptions.

No display function

HW …\...
HW insulation

Temperature high

Sol 1,2 high

Solar low

AC not connected and:

1. insufficient irradiation

2. DC switch in Off position

3. DC fuse blown

4. No PV power (voltage out of range)

Hardware problem
Isolation fault. Resistance between DC
and PE is too low.
Disconnect due to too high internal heat

sink temperature

Solar input 1 and/ or 2 over voltage (DC
> 1000 V). Inverter may be damaged.

Solar 1 and 2 voltage low due to low
irradiation. Inverter has shut down.

If no display appears during daytime,
contact your installer.
Move DC switch to the ON position.

Check string fuses.

The DC voltage should be 200-1000V.

Contact your installer.

Check the PE connections.

The inverter will start up again as soon
as It has cooled down.

Check PV array open circuit voltage,
check OVP in your StringMaster

Contact your installer.

Check: string fuses, DC switch, DC

cable. Wait till sunrise.

White

White

White

ON, Derating

ON, Pwr Mgmt xx%

xx ranges 100, 60,
30, 0

ON, Sol1 Low , Sol2
Low

Not Connected

LOW

OVP 1 (2)

Power Reduction due to: 1. internal tem-

perature, 2. fan failure (max. 75% load

then), 3. DC voltage <350V or >800V, 4.
Lower AC voltage.
Power reduction by request of the grid
operator (via DataControl Premium/ Pro

II). Range 0% (no power), 30%, 60% and
100% (maximum power).

Solar input voltage 1 and/ or 2 low.
The inverter is still operating.

StringMaster has no connection to
MasterBus. StringMaster has not been
configured.

Performance (current) low

Over Voltage Protection of Input 1 or 2

Check the fan, MasterBus power
setting and the voltages.

Check the string fuses, DC switch if
applicable, DC cable; wait till sunrise.

Check MasterBus cabling and

MasterBus configuration.

Check fuse, cabling, irradiation
of PV modules (shadows spoil the
performance).

Check Input 1 or 2 varistor.

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13 TECHNICAL SPECIFICATIONS

CS15TL RP CS20TL RP CS30TL RP
GENERAL SPECIFICATIONS

Operating temp. Ambient temperature -20°C to 60°C (full power up to 45 °C. )

Enclosure Powder coated aluminum
Protection degree IP65 electronics for outdoor application
Pollution degree II

Relative humidity 4 – 100% condensing.

Operation altitude 2000m
Safety class Class I metal enclosure with protective earth

Weight 65 kg (143 lbs) 65 kg (143 lbs) 75 kg (165 lbs)

Dimensions See section 13.2 See section 13.2 See section 13.2

SOLAR INPUT (DC)

Recommended PV power range 13 kWp – 19 kWp 18 kWp – 25 kWp 26 kWp – 38 kWp
Maximum input power 17 kW DC 22 kW DC 33 kW DC

Start up power 20 W 20 W 20 W
Operating voltage 200 V DC – 950 V DC 200 V DC – 950 V DC 200 V DC – 950 V DC
Nominal voltage 650 V DC 650 V DC 650 V DC
MPP voltage range @ nominal
power 350-800 V DC 350-800 V DC 460-800 V DC
Absolute maximum voltage 1000 V DC 1000 V DC 1000 V DC
Maximum array capacitance 6 µF total for 2 inputs

Number of inputs 2 MPP trackers / 2 inputs,

Connectors 2 x 2 PV MultiContact 2 x 2 PV MultiContact 2 x 2 PV Phoenix Contact
Rated current 2 x 23 A (can be paralleled) 2 x 30 A (can be paralleled) 2 x 34 A (can be paralleled)
PV module safety qualification The connected PV modules must be IEC 61730 Class A rated.
String connections Optional string box with DC switch, surge protection and string fuses available.

GRID OUTPUT (AC)

Voltage 230V (3phase, 4 wire Y) +/- 20%
Nominal power 15 kVA 20 kVA 30 kVA
Maximum power 15.75 kVA 21 kVA 31.5 kVA

Nominal current 3 x 24 A 3 x 32 A 3 x 46 A
Max. Inrush Current 28.2A

Short circuit L-N 150A peak/ 12.9A RMS(3 cycl) during 8ms
Short circuit L-L 298A peak/ 21.8A RMS (3 cycl) during 4ms

Frequency 50 / 60 Hz
Nominal power factor > 0.99 at full power
Reactive power control 0.80 inductive – 0.80 capacitive
DC current injection < 20 mA

Harmonic distortion < 3 % THD

Stand by power < 2 W

EU efciency 97.6 % 97.7 % 97.7 %
Maximum efciency 98 % 98.1 % 98.1 %
Connector 3 Ph + N + PE ; IP67 3-phase AC plug

Fuse External fuses required

SAFETY DEVICES

Anti Islanding protection Compatible with national standards.

Safety devices DC side

Safety devices AC side

• isolation resistance measurement • polarity protection (diodes) • class III surge
protection (varistors) • overpower / overcurrent • temperature controlled power derating

• voltage / frequency window • redundant AC relays • integrated RCD (AC/DC sensitive),
trip levels: 30 mA jump, 300 mA continuous • DC current injection protection

• class III surge protection (varistors)

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SYSTEM INFORMATION

User interface

Diagnostics

Enclosure

External communication

MISCELLANEOUS

MasterBus powering Yes, if AC and/or DC is available

MasterBus languages English, Nederlands, Deutsch, Français, Castellano, Italiano, Norsk, Svenska, Suomi, Dansk *

* The number of menu languages may change without prior notice.

13.2 OUTLINE DRAWINGS

Figure 13-1:
Outline drawings of the CS inverter.
All dimensions are in mm (inch).

Cooling User replaceable fan bracket

String box option

Transformer option

Multi-language black-on-white graphical LCD display. Languages: English, Nederlands, Deutsch,

Français, Castellano, Italiano

• 10 years datalogger and real time clock

• 10 years diagnostic memory

Aluminium with powder coating.
Rubber foot stands are part of the enclosure.

Mounting bracket.
IP65 enclosure; Integrated DC load switch 2x1000V DC /30A; Integrated string fuses;
Integrated string current monitoring via Masterbus connection to inverter;

12 (2 x 6) string connections with 4 mm type connectors or glands.

3-phase transformer in IP54 enclosure; Cooling: natural convection; Transformation losses : max 2%
Weight 200 kg.

A: MasterBus stringbox and transformer interface with two connectors
B: MasterBus field service interface with two connectors
C: 2 RS485 connections for DataControl Professional, max. 20 inverters, 1000 m max. cable length

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39

EN / SunMaster CS15TL RP / CS20TL RP / CS30TL RP

14 ORDERING INFORMATION

Part number Description

131210150 SunMaster CS15TL RP with Reactive Power
131210200 SunMaster CS20TL RP with Reactive Power
131210300 SunMaster CS30TL RP with Reactive Power
131300500 SwitchMaster CS 2-3 SW 30 string box for maximum 2x3 strings.
131300600 SwitchMaster CS 2-3 SW 30 OVP, SwitchMaster plus overvoltage protection.
131300700 SwitchMaster CS 2-5 SW 40 OVP, max 2x5 strings plus overvoltage protection plus string fusing.
131300100 Isolation transformer CS-IT20
77040000 MasterBus terminating device
77040020* MasterBus connection cable (UTP patch cable), 0,2m / 0.6ft
77040050* MasterBus connection cable (UTP patch cable), 0,5m / 1.6ft
77040100* MasterBus connection cable (UTP patch cable), 1,0m / 3.3ft
77030100 MasterBus - USB interface (required as interface between your PC and the CS inverter)
77010105 MasterView Easy MkII. (monitoring and control panel for conguration of the power modules
with the local regulations for grid connection).

130394000 MasterLog – Free software package to monitor your photovoltaic (PV) system using your PC or
notebook. Use of PC Link is compulsory.
130500610 USB PC Link

130397000 Data Control ‘Premium’ II local – Datalogger to monitor up to 6 CS inverters locally
130397100 Data Control ‘Premium’ II remote – Datalogger to monitor up to 6 CS inverters over the Internet
130397200 Data Control ‘Pro’ Analogue – Datalogger to monitor up to 20 CS inverters locally or over the Internet
130397210 Data Control ‘Pro’ ISDN – Datalogger to monitor up to 20 CS inverters locally or over the Internet
130397220 Data Control ‘Pro’ GSM – Datalogger to monitor up to 20 CS inverters locally or over the Internet
130397230 Data Control ‘Pro’ Ethernet – Datalogger to monitor up to 20 CS inverters locally or over the Internet
130010905 RS485 modular communication cable, cross wired, 8 pole, 1 meter / 3 ft
130010906 RS485 modular communication cable, cross wired, 8 pole, 5 meter / 16 ft
130010910 RS485 modular communication cable, cross wired, 8 pole, 10 meter / 33 ft
130010915 RS485 modular communication cable, cross wired, 8 pole, 15 meter / 49 ft
120107000 Complete set to assemble RS485 modular communication cables.

Delivery includes: 100 meter modular cable, 100 pcs. modular jacks and crimping tool.

*Other lengths of MasterBus connection cables upon request

See chapter 5 for an overview of parts that are included with the delivery of the CS inverter.
Mastervolt offers a wide range of products for both grid connected and independent autonomous electrical installations.
See www.mastervolt.com for an extensive overview of all our products.