ISO 20690:2018

INTERNATIONAL ISO
STANDARD 20690
First edition
2018-02
Graphic technology — Determination
of the operating power consumption
of digital printing devices
Technologie graphique — Lignes directrices pour déterminer la
consommation électrique des dispositifs d'impression numérique
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions . 5
4.1 Condition, age and machine combination . 5
4.2 Connection conditions . 6
4.3 Printing conditions and operational modes . 7
4.3.1 General. 7
4.3.2 Measurements required for energy efficiency . 7
4.3.3 Measurements required for power consumption . 8
4.4 Measuring conditions . 8
4.5 Measurement cycle . 8
4.6 Calculation and documentation of measurement results .11
Annex A (normative) Measurement data sheet .13
Annex B (informative) Operating power consumption measurement procedures for digital
printing devices .17
Bibliography .23
Foreword
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URL: www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 130, Graphic technology.
iv © ISO 2018 – All rights reserved

Introduction
Estimates of operating costs for digital printing devices often include a calculation of energy
consumption. However, energy efficiency comparisons are currently impossible to make, as there is no
standard reference for their calculation.
It is common industry practice to estimate energy usage based solely on the connected load of a machine.
This is not a very reliable method, however, as this means that, in many cases, the calculated values
(e.g. 70 % of the power consumption) do not reflect the actual usage of the machine and its energy
[7] [8]
consumption . Actual energy consumption often differs significantly from the estimated values .
Using these methods, power consumption data across devices can, therefore, not be compared, since the
calculations have not followed a common framework that takes into account the influence of peripheral
equipment such as IR or UV dryers and measurement cycles. This document provides requirements for
the measurement of the parameters needed to estimate the energy efficiency (e.g. 1 000 A4 sheets/kWh)
that correspond to the actual energy consumption for a defined machine combination.
This document specifies a method for the estimation of energy efficiency for digital production printing
presses, also known as professional digital printing presses. It is up to the manufacturer of a digital
printing system to declare whether it is suitable for use as a digital production printing press and, in
such cases, this document is applicable.
Specifications to calculate the energy consumption of conventional sheet-fed and web-fed offset
[5] [6]
machines and office equipment exist and are widely used. This document is therefore, not
applicable for the calculation of energy efficiency of conventional sheet-fed and web-fed offset printing
machines, or for office equipment.
The universal availability of accurate and verifiable energy consumption data will enable printing
machinery buyers, printers and their customers to assess the energy efficiency of digital production
printing presses. However, the user of this document should understand that the effectiveness of power
does not dictate quality acceptance levels of the expected output that a customer may require. Power
consumption is an important part of all the output requirements and quality standards necessary for
maintaining the quality and repeatability required by the print buyer. Energy efficiency can be reported
in various ways, such as the number of prints printed per kWh, or as the amount of energy required in
kWh to produce a specific number of prints. This information can be used to
— assess the power consumption and energy efficiency of machines including peripheral devices,
— estimate operating costs for investment planning,
— benchmark energy efficiency of digital production presses,
— measure energy efficiency improvements of digital printing devices over time or for dedicated
process variations, and
— provide data to enable companies to claim environmental subsidies, when replacing equipment
with more energy efficient equipment.
This document defines how to calculate the electrical energy requirements and thus the energy
efficiency of digital printing devices.
When comparing the results obtained from this document, care should be taken that the devices being
compared were set up to produce the same print quality using comparable types of printing technology,
process and device configurations. This document may not be suitable for all devices, such as those
resulting from continuous developments. It is intended to be revised as the technology evolves.
INTERNATIONAL STANDARD ISO 20690:2018(E)
Graphic technology — Determination of the operating
power consumption of digital printing devices
1 Scope
This document provides requirements and recommendations for measuring the electricity consumption
of small-format and wide-format digital production presses printing in different modes of operation. It
is intended for use on equipment that has been declared by the manufacturer to be suitable for use as a
digital production printing press.
This document provides a means to compare the energy efficiency figures according to two or more
characteristic machine combinations: Best Quality (BQ), Best Productivity (BP) or other combinations.
This document is not suitable for determining the power consumption of individual device components
such as servos, fans, compressors, control boards and so on. It excludes digital presses designed to print
textiles intended for clothing or machines, which similarly depend on additional processes to produce
the printed product, such as ceramics.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60204-1, Safety of machinery — Electrical equipment of machines — Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
electrical energy
E
equivalent to electrical energy converted to other forms of energy (power, light, heat) for the operation
of machines and devices
Note 1 to entry: Electricity generated in this way is calculated using the following formula:
t
E =×ut() it()dt
∫
t
where u(t) and i(t) are the instantaneous values of voltage and current.
3.2
energy usage
power required for the operation of a given process over time
Note 1 to entry: Energy usage or electric energy consumption is typically measured in watt seconds, kilowatt-
hours or watt-hours; Symbol Ws, kWh or Wh.
3.3
connected load
theoretically possible maximum power consumption of a machine, which can be expected when
components of the printing machine are running at maximum load
Note 1 to entry: The connected load is the power specified by the manufacturer and used to rate the electrical
power supply of the printing house (power rating, fuse rating, cable cross section). This ensures fail-safe
operation of the machine under any possible operating condition. Determination of the connected load value has
not been uniformly regulated so machine manufacturers handle it differently.
Note 2 to entry: The connected load should not be used to calculate a device’s actual power consumption. This is
always lower, and in most applications, it is significantly lower.
3.4
operational power consumption
power consumption of a machine in a defined operating condition (operational mode)
Note 1 to entry: Active power, reactive power and apparent power are distinct operational power consumptions.
Typical operating modes are Sleep, Print Ready and Production (also known as active mode).
3.5
active power
P
power available for conversion into other types of power
Note 1 to entry: Mechanical, thermal or chemical power. In general, the active power of a consumer in a periodic
AC voltage system can be determined with the formula
T
PT=×1/(ut)(it)dt
∫ 0
where T is the desired period.
Note 2 to entry: standard unit: watt, kilowatt; symbol: W, kW.
3.6
reactive power
Q
power caused by inductive, capacitive and non-sinusoidal consumers placing additional burden on
supply network
Note 1 to entry: Standard unit: volt ampere reactive; Symbol: var, kvar.
3.7
apparent power
S
geometric sum of active power, P, (3.5) and reactive power, Q, (3.6) and/or t
...