Zennio KEM User manual

KEM
KNX Energy Monitor
ZEMKEM
USER MANUAL
Application program version: [1.0]
User manual edition: [1.0]_a
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CONTENTS
Contents........................................................................................................................................ 2
1 Introduction ............................................................................................................................. 4
1.1 KEM .................................................................................................................................. 4
1.2 Installation........................................................................................................................ 5
1.3 Measured quantities ........................................................................................................ 7
1.3.1 Electricity .................................................................................................................. 7
1.3.2 Water........................................................................................................................ 8
1.3.3 Heat/Cool quantity ................................................................................................... 8
1.4 Data inicialization after a download................................................................................. 9
1.5 Setting the time of day................................................................................................... 10
2 Configuration ......................................................................................................................... 11
2.1 General........................................................................................................................... 11
2.1.1 Configuration.......................................................................................................... 11
2.1.2 Partial Registers: Global Configuration................................................................... 12
2.2 Electricity........................................................................................................................ 14
2.2.1 Configuration.......................................................................................................... 14
2.2.2 Phase x.................................................................................................................... 17
2.3 Water.............................................................................................................................. 21
2.3.1 Configuration.......................................................................................................... 21
2.3.2 Channel x ................................................................................................................ 24
2.4 Heat/Cool quantity......................................................................................................... 28
2.4.1 Configuration.......................................................................................................... 28
2.4.2 Heat Quantity x....................................................................................................... 29
2.5 Notifications ................................................................................................................... 33
2.5.1 Notification n.......................................................................................................... 33
2.6 Alarms............................................................................................................................. 35
2.6.1 Alarm n ................................................................................................................... 35
2.7 Inputs.............................................................................................................................. 38

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2.7.1 Binary input ............................................................................................................ 38
2.7.2 Temperature probe ................................................................................................ 38
2.7.3 Motion detector ..................................................................................................... 38
2.8 Logic functions................................................................................................................ 40
ANNEX I. Flow calculation ........................................................................................................... 41
ANNEX II. Communication objects.............................................................................................. 42

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1INTRODUCTION
1.1 KEM
The KEM (KNX Energy Monitor) is an electrical energy (for single-phase systems), water
consumption and calorific energy meter. Its use will ease a more efficient consumption
of energy resources, resulting in savings for the user.
KEM is able to measure and report in the KNX system the values of energy, water
consumption and caloric energy along with other magnitudes related to these three.
Alarms and notifications can be configured as warnings when a magnitude exceed the
limits established, for example, to disconnect low priority systems to reduce
consumption.
The most outstanding features of KEM are:
Measurement of power and electrical energy of up to 3 single-phase circuits.
Support for frequencies of 50 and 60 Hz.
Measurement of flow and consumed water of up to 4 channels.
Measurement of calorific energy consumed (for both cooling and heating)
from up to 2 climate systems.
Up to 7 Alarms for electrical power, electrical current or flow.
Up to 10 notifications for water consumption or electrical energy.
Synchronisation with an external KNX clock.
10 customisable, multi-operation logic functions.
5multifunction inputs parameterisable as binary input, motion sensor or
temperature sensor.
Heartbeat or periodic “still-alive” notification.

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Figure 1. KEM. Element scheme
1.2 INSTALLATION
Figure 1 shows the element scheme of KEM:
KEM connects to the KNX bus via the built-in terminals (8). An external DCpower supply
is not needed.
Once the device is provided with power from the KNX bus, both the individual address
and the associated application program can be downloaded.
To carry out electricity consumption measurements, it is necessary to connect the
Zennio current transformers to the KEM inputs intended for that use (2). A different
transformer will be required per electrical line being monitored. Thus, if three electrical
lines are going to be monitored, one transformer will need to be connected to the slots
CT1 +/- (referred to as “Phase 1”), another one to the slots CT12 +/- (“Phase 2”), and a
third one to the slots CT3 +/- (“Phase 3”).
For water consumption measurements, the output of each flow meter will be connected
to the flow meter inputs of KEM (7). The flow meter will be supplied from the 5V power
output of KEM (5). Note that this output will only be live if at least one of the channels for
water measurement is enabled in the parameterisation (see section 2.3).
3
2
5
4
6
1
7
8
1. Analog/digital inputs
2. Current transformer connections
3. Programming button
4. Programming LED
5. Flow sensor power output
6. Fit clamp
7. Flow meter sensor inputs
8. KNX connector

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To calculate the calorific energy consumed by the system is required, in addition to the
flow meter, it is necessary to know the temperature of the fluid at the outlet (supply) and
at the inlet (return) of the air-conditioning circuit. For this purpose, the temperature
probes incorporated in the flow meters and fittings supplied by Zennio can be used. Each
one of these probes can be connected in any of the 5 analogue/digital inputs (1).
A short press on the Prog./Test button (3) will make the device enter the programming
mode. The Prog./Test LED (4) will light in red. On the contrary, if this button is held while
plugging the device into the KNX bus, the device will enter the Safe Mode. In such case,
the programming LED will then blink in red.
For detailed information about the technical features of the device, as well as on the
installation and security procedures, please refer to the corresponding Datasheet,
bundled with the original package of the device and also available at www.zennio.com.

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1.3 MEASURED QUANTITIES
Next, the quantities measured by the KEM that can be sent to the bus for monitoring are
described.
1.3.1 ELECTRICITY
Magnitudes of each conductor or phase:
Current:rms value expressed in milliamps [mA].
Active power: effective power capable of transforming electrical energy into
work. Measured in watts [W] or kilowatts [kW], as selected by parameter.
Consumed active energy: time integration of the active power. Measured in
watts hour [W·h] or kilowatts hour [kW·h], as selected by parameter.
Global magnitudes:
Current: arithmetic sum of the currents of each of the phases.
Active power: sum of the active powers of each of the phases. Measured in
watts hour [W·h] or kilowatts hour [kW·h], as selected by parameter.
Consumed active energy: time integration of the global active power.
Measured in watts hour [W·h] or kilowatts hour [kW·h], as selected by
parameter.
There are two additional objects that represent magnitudes not measured by KEM.
Although they are set by parameter, assigning them the desired value by object is
possible:
Voltage: magnitude available for each phase expressed in rms and millivolt
units [mV].
Power Factor: global magnitude that expresses the relation between active
and apparent power (dimensionless).

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1.3.2 WATER
Magnitudes of each water channel:
Flow: water flow measured in liters per hour [L/h] or cubic meters per hour
[m3/h].
Consumed water: quantity of water consumed calculated from the flow rate
and elapsed time. Its units will be litres [L] or cubic metres [m3] as indicated by
parameter.
Global water measures:
Flow: sum of the flow of each channel. Measured in litres per hour [L/h] or
cubic meters per hour [m3/h], as indicated by parameter.
Consumed water: sum of the water consumed by each of the channels.
Measured in litres [L] or cubic meters [m3] as indicated by parameter.
ANNEX I. Flow calculation details how to calculate the flow rate from the frequency
measured by the flow meter.
1.3.3 HEAT/COOL QUANTITY
The magnitudes measured by each channel are:
Temperature difference: difference between forward temperature and return
temperature.
Heat quantity: calorific energy consumed by the associated water channel
when the temperature difference is positive. It is measured in joules [J].
Cool quantity: calorific energy consumed by the associated water channel
when the temperature difference is negative. It is measured in joules [J].
Heat/cool quantity: sum of the calorific energy consumed during both heating
and cooling. It is enabled by an ETS parameter and is always measured in
joules [J].

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1.4 DATA INICIALIZATION AFTER A DOWNLOAD
It is important to keep in mind that, when reprogramming the device from ETS (either
partial or complete downloads), the consumption variables and therefore any data
accumulated so far are cleared on both partial and total registers.
If it is required to maintain the present consumption values, before carrying out the
download, the option “maintain the current values”must be activated in ETS in the
desired registers, or an initial value must be parameterised (see sections 2.2.2, 2.3.2
and 2.4.2 for more details).
There are also certain objects with the flag W enabled, so they can be initialized directly
writing the desired value in the communication object.
It is important to note that global objects are always the sum of channels or phases, so
it is not possible to set a value after download for these nor have flag W enabled.

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1.5 SETTING THE TIME OF DAY
For certain functionalities, such as periodic registers or the starting date of each register,
it is necessary to set the time of day of KEM through a master clock in the installation.
During the start-up, KEM will request the time of day to the KNX bus through the objects
“Date” and “Time of day”. Up to four read requests will be sent (after a customisable
initial delay). If there is no response after these four requests, the device sets the last
known date and time.
Notes:
The time count is performed internally by KEM. However, any timeadjustments
must be notified (through external events) in order to ensure the
synchronisation of the periodic timing of the registers.
Periodic synchronise of the internal clock of KEM is advisable to prevent
precision loss after prolonged operation. Therefore, KEM sends a time request
to the KNX bus every 15 minutes.
Please take into account that the device does not start measuring until it has a
valid date and time.