LAB-EL LB-762, LB-764, LB-760, LB-766 Installation Manual

LAB-EL

ELEKTRONIKA LABORATORYJNA

Herbaciana 9

05-816 Reguły

PL

tel: [phone]

fax: [phone]

www: www.label.pl

email: [e-mail]

LB-762 Controller Installation Manual

Release 7

24 października 2019

Copyright © 2008-2019 LAB-EL

LB-762 Controller Installation Manual LAB-EL

Spis treści

1 System description 4

1.1 External connections of a single LB-762 regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Measurement probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Executive equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Data transmission network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.1 Ethernet network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.2 RS-485 network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Cooperation with LB-760 regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.6 Collective measurement of external air parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.7 Collective CO2concentration measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 Elements of regulator 11

2.1 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Signaling LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.1 Errors in operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2.1.1 Front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2.1.2 Signaling LEDs on the main plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Connectors description 14

3.1 Mains supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.2 Earthing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3 Measurement probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3.1 Psychrometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.3.2 Thermometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.4 Analog input 0-10V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4.1 Connection of analog CO2concentration meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.5 Inputs of S300 measurement sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.5.1 Connection of CO2concentration meter type LAB-EL LB-850 . . . . . . . . . . . . . . . . . . . . . . 16

3.5.2 Connection of hytherograph type LAB-EL LB-710 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.6 Relay outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.6.1 Connection of OPEN-CLOSE 230V valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.7 Outputs of analog servomotors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.7.1 Servomotor power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.7.2 Connection diagrams - actuator with analog input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.7.3 Connection diagrams - actuator open-close . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.8 Bus of digital servomotors BELIMO MP-BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.8.1 Servomotor power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.8.2 Connecting cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.8.3 Connections diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.8.4 Setting of servomotor addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.9 Analog outputs 0-10V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.10 Ethernet network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.10.1 Conguration example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.11 RS-485 network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.11.1 Termination of RS-485 network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Spis rysunków

1.1 External connections diagram of LB-762 regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

LB-762 Controller Installation Manual LAB-EL

1.2 Executive equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Scheme of a system with several LB-762 regulators and Ethernet network . . . . . . . . . . . . . . . . . . . . 7

1.4 Scheme of a system with several LB-762 regulators and RS-485 network . . . . . . . . . . . . . . . . . . . . . 7

1.5 Scheme of a system with LB-762 and LB-760 regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.6 Scheme of a collective system of CO2concentration measurement . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Connectors of regulator LB-762 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.1 Scheme of psychrometer connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 Scheme of connection of temperature probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3 Scheme of connection of FUJI ZFP9 type meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4 Scheme of connection of LAB-EL LB-850 type meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.5 Scheme of connection of LAB-EL LB-710 type meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.6 Scheme of connection system of a typical valve to relay output . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.7 Scheme of connection of analog servomotors Belimo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.8 Scheme of connection of analog servomotors Johnson Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.9 Scheme of connection of analog servomotor without return signal . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.10 Scheme of connection of open-close actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.11 Scheme of connection of bus of servomotors BELIMO MP-BUS . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.12 Scheme of connection of frequency converter type OBRUSN PC3.., OBRUSN PC4.., SSD Drives 605, SSD

Drives 650 and similar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3.13 Scheme of RS-485 network connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.14 Scheme of correct and incorrect RS-485 network topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.15 RS-485 network termination switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Spis tabel

3.1 Maximum cable length for section 0.75mmmm2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3

LB-762 Controller Installation Manual LAB-EL

Rozdział 1

System description

Regulator LB-762 is used to control a single mushroom cultivation hall. It provides all necessary measurements and control
over appropriate executive devices to ensure optimum climatic conditions for fungi cultivation.

LB-766 controller is used to control a single storage room. Regarding installation details, it is identical to LB-762 controller
and this manual is applicable to both types.

For a greater facility, consisting of more cultivation halls, each hall must be equipped with a separate regulator. In this case
it is possible to connect all the regulators into a common measurement-regulation system. In such system each regulator
operates autonomously, but it is possible to control together all the regulators from one PC computer and appropriate
software. Additionally, it is possible to perform some functions common for the entire system, such as measurement of
external air parameters or CO2concentration measurement.

Regulator LB-764 is LB-762 model with special modications prepared for ”Baltic Champignons”, installation instructions

also applies to this regulator.

1.1 External connections of a single LB-762 regulator

Figure1.1 presents a scheme of typical external connections of a single LB-762 regulator. To the regulator one should attach
a set of suitable measurement probes and executive equipment so that it could perform its functions.

Rysunek 1.1: External connections diagram of LB-762 regulator

1.2 Measurement probes

• Psychrometers – are used for measurement of temperature and relative air humidity. The regulator may co-operate with
or one two psychrometers (at least one is required for proper operation of the regulator). Attaching one psychrometer
provides one-point air temperature and humidity measurement in the cultivation hall. The second psychrometer may be
optionally used for temperature and humidity measurement elsewhere in the cultivation hall, for better averaging of the

4

LB-762 Controller Installation Manual LAB-EL

conditions prevailing in the room. Another function of the second psychrometer may be measurement of air parameters
in air intake channel for regulation of humidity and temperature of air owing into the hall.

• Cooler temperature – single thermometer advising the regulator of cooler work.

• Heater temperature – single thermometer advising the regulator of heater work.

• Air supply temperature – optional single thermometer advising the regulator of temperature of air supplied to the air­conditioning tunnel (before the cooler). Application of this thermometer is optional.

• Base temperature – 6 thermometers used for measurement of temperature of base in dierent places of the hall. It is not
required to attach all 6 thermometers – the regulator correctly cooperates with any number of attached thermometers –
from 1 to 6, depending on the requirements of the given installation.

• CO2concentration – for CO2measurement, it is necessary to attach a separate dedicated CO2concentration meter. It is
possible to connect for each regulator a dedicated CO2meter (separate meter for each hall), or use one CO2meter for
more than one hall (what permits reduction in the cost of the installation). Detailed description further the manual.

• External hytherograph – to ensure better operation of mechanisms controlling climate in the cultivation hall, the regulator
may use information about external air parameters owing into the air-conditioning tunnel. This allows for using directly
the properties of this air (enthalpy and humidity mass) to control climate in the hall, without use of executive devices
of air-conditioning tunnel, what may reduce energy consumption. It is possible to connect to each regulator a separate
hytherograph, or apply one hytherograph for the whole system (what permits reduction in the cost of the installation,
as parameters of external air are normally common for all three halls and individual measurement for each hall is not
reasonable). Application of this meter is optional.

1.3 Executive equipment

Rysunek 1.2: Executive equipment

• Heating, cooling, moistening, initial heater valves, initial cooler, steam valves – are controlled by servomotors (some
outputs are optional and may not occur in the given installation).

• Ventilation – the fan is used to provide air circulation, its motor is controlled by an appropriate frequency converter
(inverter). The frequency inverter is an external device, which is appropriately controlled by the regulator.

5

LB-762 Controller Installation Manual LAB-EL

• Hall lighting – the regulator has the possibility to control lighting in the hall, what is used e.g. at gasing operation.

• Alarm signaling device – the regulator has the possibility to signal alarm situations (e.g. inappropriate parameters of
climate in the hall, dierent breakdowns, etc.). The regulator has a suitable relay output for alarm signaling, which may
control e.g. sound signaling device. It is possible to connect alert signalling to each regulator separately, or by a joint
connection of alert outputs of all regulators in the given installation and common control with one signaling device. The
application of alert signaling device is optional. It is also possible to signal an alert via control software on a PC computer.

1.4 Data transmission network

In an installation where there is a greater number of regulators, it is possible to connect them into a data transmission network.
This network ensures cooperation with a PC computer and relevant control software. By means of a data transmission
network, the system can also perform additional functions:

• external air parameters measurement (using single thermohygrometer),

• common CO2measurement (whe single CO2sensor services many growing rooms).

The regulator is equipped with two data transmission network interfaces: Ethernet and RS-485. The application of a relevant
network is dependent upon conditions and requirements in the given installation:

• Ethernet – this network provides very high data transmission speed (10 or 100 MBit/s). Owing to great popularity of this
type of networks in any other applications, it is easy to integrate it with already existing data communication systems.
Limitation of the Ethernet network is distance – one cable section (between two network devices, e.g. between the regulator
and switch) cannot be longer than 100 meters. This does not mean that the whole network may not have greater range
– with application of proper network devices (switches, repeaters or even routers) the network can be expanded over any
area. The number of devices in an Ethernet network is relatively unrestricted – the only practical limits result from the
type of network devices used (switches) and the adopted IP network addressing class.

• RS-485 – this network provides relatively slow data transmission as compared to the Ethernet network (19.2 kbit/s),
however, its advantage is simplicity of cabling and greater scope without use of additional network devices (up to 1200
meters). As a result, cabling of networks is easier and a bit cheaper. One single RS-485 network has a limit of the number
of attached devices – from 1 to 32. network extension to a greater number of devices requires application of proper network
devices (repeaters).

Selection of the network type depends on the given installation – if it is possible to use Ethernet network, it is suggested
to use this type of network. It provides greater comfort of use (greater transmission speed of data means smaller delay in
system response, faster reading of data from regulators, etc.). If, however, the facility is very extensive and the application
of Ethernet network would require use of a number of additional network devices, boosting the cost over the benets, one
can use RS-485 network.

To ensure greater reliability, it is also possible to operate both networks. In such case, the system can use the Ethernet
network as the basic one, and in case of network failure (what is more likely than in RS-485 network owing to the need to
apply additional network devices) it would be possible to switch to RS-485 network.

1.4.1 Ethernet network

Figure1.3 presents a scheme of installation in which N LB-762 type regulators are combined by means of an Ethernet
network. The number of regulators that can be connected in an Ethernet network is practically unrestricted. The length of a
single cable section between two network devices (in a typical case, between the regulator or computer and network switch)
cannot be longer than 100 meters, but the network can be prolonged by means of relevant network devices, cascade joined
switches or routers.

Comments with regard to the method of cabling Ethernet network can be found in Section3.10.

6

LB-762 Controller Installation Manual LAB-EL

✁✂✄☎✁

✆✝

✁✂✄☎✁ ✁✂✄☎✁ ✁✂✄☎✁ ✁✂✄☎✁

✞✟✠✠

✡☛☞✌✍✎

✞✟✠✠

✁✄✏✑✂✒✓✄✑✏✁✄

✡☛☞✎

✔✠

✞✟✠✠

✏✒

✄☎✒✕✝

✑✖

✡☛☞✍

✗✠

✁✂✄☎✁

✁✂✄☎

✂

✆✝✞✟✠

✡✄☛✡✂☞✡✄

✆

✌✍✍

✎✏✝✞✟✑

✆

✌✍✍

✄✡✂✒✁☛✓✔✂✁✒✡✄✂

✎✏✝✑

☎✍

✡✄☛✡✂☞✡✄



✕

✆

✌✍✍

✒✓✡✂☞✓✖✕✁✗

✎✏✝✟✠

✍

✂

✆✝✞✟✠

✂

✆✝✞✟✠

✂

✆✝✞✟✠

✂

✆✝✞✟✠

Rysunek 1.3: Scheme of a system with several LB-762 regulators and Ethernet network

1.4.2 RS-485 network

Figure1.4 presents a scheme of installation in which N LB-762 type regulators are combined by means of a RS-485 network.
The number of regulators that can be connected in one RS-485 network segment is from 1 to 32 (see description of RS-485
network connections), maximum total length of cable is 1200 meters.

RS-485 network requires the application of LB-480 module that works as converter of communication interfaces. Connection
between a PC computer and LB-480 module is by means of Ethernet network. LB-480 module communicates with the
regulators by means of RS-485 network. Additionally, to LB-480 unit common system equipment may be attached – such as
an external hytherograph and CO2concentration meter.

Comments with regard to the method of cabling RS-485 network can be found in Section3.11.

Rysunek 1.4: Scheme of a system with several LB-762 regulators and RS-485 network

7

LB-762 Controller Installation Manual LAB-EL

✁✂✄☎✆ ✁✂✄☎✆✁✂✄☎✆✁✂✄☎✆

✁✝✞✞

✟✠✡☛☞✌✍☛✡✠✟

✎✏✂✑✒

✞

✁✝✞✞

✡✌✠✓✌✔ ✕☛✖

✎✏

✂☎✆✞

✗☛✟

✒

✁✂✄☎✆

✁✝✞✞ ✗☛✟✖

✁✂✄☎✆

✠✟☞✠✓✠✟

✠✟☞✠✓✠✟

✗✕

✎✏

✂✄☎

✑

✁✂✄☎✆ ✁✂✄☎✆ ✁✂✄☎✆ ✁✂✄☎✆

1.5 Cooperation with LB-760 regulators

LB-762 regulators can be used in systems where LB-760 regulators have been used so far. It is possible to build one common
system in which both types of regulators operate to provide performance of respective system functions regardless of the
type of regulator (such as common measurement of external air parameters and collective CO2concentration measurement
system).

Unfortunately owing to software incompatibility between the regulators and inconsistency of communication protocols it
is impossible to use a common RS-485 network for both types of regulators. LB-760 type regulators must have its own
RS-485 network, while LB-762 regulators must have their own, separate network. If LB-762 regulators use Ethernet, this
will necessarily be a separate network. If LB-762 regulators are connected by means of RS-485, one should route a separate
RS-485 network cable for LB-762 regulators.

Figure1.5 presents a scheme of a sample common installation with LB-762 and LB-760 type regulators, using RS-485 network
for LB-762. The scheme with Ethernet network is analogous - LB-760 regulators remain connected by RS-485 network, while
for LB-762 RS-485 network should be replaced with Ethernet network.

Rysunek 1.5: Scheme of a system with LB-762 and LB-760 regulators

1.6 Collective measurement of external air parameters

In the measuring system consisting of more regulators (both LB-762 and LB-760), it is possible to use a single hytherograph
to measure external air parameters. It is also possible to connect individual hytherographs to dierent regulators, but with
regard to the fact that they normally measure parameters of the same air, this is not reasonable. Use of a single meter
permits reduction of installation costs.

Connection of external hytherograph is independent from the type of applied data transmission network (Ethernet/RS-485).
On Figure1.3 i Figure1.4 external hytherograph is described as LB-710 HYTHEROGRAPH.

Hytherograph can be attached to any device in the network that has an S300 input. This may be LB-480 module (having
8 S300 inputs), as well as each of LB-762 regulators, having 2 S300 inputs (despite connection to individual regulator, the
whole system can be congured to use this hytherograph as a source of data for all other regulators). However, for reasons
of reliability of the system, it is advised to connect hytherograph to LB-480 unit – this module is common for the entire
system and operates independently of all regulators. In the case of connecting the hytherograph to LB-762 regulator when
the regulator is disabled or fails for some reason, the whole system of collective measurement of external air parameters will
cease to operate.

8

LB-762 Controller Installation Manual LAB-EL

Important

For operation of collective measurement of external air parameters it is necessary to ensure ongoing operation of the
control software on a PC computer.

1.7 Collective CO2concentration measurement

In the measuring system consisting of more regulators (both LB-762 and LB-760), it is possible to ensure CO2concentration
measurement in two ways:

• local measurement – each regulator has its own individual CO2meter,

• collective measurement – one CO2meter covers more cultivation halls.

Connecting individual CO2meters is relatively costly, the application of collective measurement permits reduction in instal­lation costs. Figure1.6 presents the scheme of a typical installation of collective CO2measurement. The system consists of
the following elements:

• CO2meter – used for CO2concentration measurement in the air supplied from dierent halls,

• pump – provides air suction from dierent halls,

• valves – provide opening of air supply from dierent halls.

Rysunek 1.6: Scheme of a collective system of CO2concentration measurement

The whole operates as follows: the system opens valves in cycles for dierent halls, accepting at a given moment air only
from one hall. The pump sucks in air for a given time and delivers it to the meter of CO2concentration (the suction time is
dependent on the length of pipes supplying air). After the specied time has elapsed, one may consider that air which has
arrived to the meter corresponds to that in the hall and the CO2meter makes the nal measurement whose result is sent to
the regulator controlling the relevant hall. Then, the air supply valve for the particular hall is shut down, and opened is the
valve for the next hall. The whole continues in cycles.

Additionally, it is possible to incorporate to the system CO2concentration measurement for external air. This has two
functions: periodic ”blowing” Of the CO2meter with fresh air with low CO2concentration and verication of correct
measurement by means of fresh air. As CO2concentration in cultivation halls is usually much higher than outdoors, the
meter working all the time in the conditions of high concentrations of CO2shows a tendency to overestimate the results, what
can be prevented by periodic delivery of fresh air. This also permits verication of correct measurement – CO2concentration
value in external air is usually a predictable value of a few hundred ppm. A radically dierent result means incorrect operation
of the meter or of the entire system of collective CO2measurement.

The limitation in the quantity of halls taking part in the collective CO2measurement is duration of the measuring cycle. For
instance: at the time of air suction from the hall of 5 minutes and 5 cultivation halls plus external air measurement, we have
cycle time = 5 minutes * (5 + 1) = 30 minutes. This means updating of CO2result in each hall every 30 minutes. Increasing
the number of halls prolongs this time in two ways: once, that each additional hall should be considered in the cycle, two,
that the length increases of pipes supplying air to the meter and, at the same time, it may be necessary to prolong the
measurement time from one hall. Too rare updates of CO2concentration measurement result does not let LB-762 regulator
eective regulate fresh air supply to the hall and, at the same time, does not permit eective CO2level regulation.

In a greater system where the number of halls and regulators would cause too long CO2measurement cycle time, it is possible
to divide the collective CO2measurement system into smaller parts. In such case in the system a greater number is installed

9

LB-762 Controller Installation Manual LAB-EL

of CO2meters, each of which covers some selected group of halls. One should create several such groups, depending on size
of the system. In such case each collective CO2measurement group operates on its own and independently of the others.
For each group it is advised to attach CO2concentration measurement in external air, for reasons previously discussed.
Separate groups of collective CO2measurement operate independently, but within one network of data transmission – it is
not required here to split the entire system into separate data transmission networks, in accordance with breakdown of CO
measurement. The data transmission network is common, CO2measurement groups are independent of this.

Important

For operation of collective CO2concentration measurement, it is necessary to ensure ongoing operation of the control
software on a PC computer.

2

10

LB-762 Controller Installation Manual LAB-EL

Rozdział 2

Elements of regulator

2.1 Connections

Warning

For the purpose of preserving user safety, all operations on connections should be conducted with regulator power supply
switched o !

To obtain access to connections it is necessary to open the regulator casing. For this purpose:

• unscrew four plastic screws on the front panel,

• open the Casing lifting up the front panel on hinges.

Connections are placed in the rear part of the casing, mostly along side edges. The exception are: Ethernet link placed on
the top and power supply and earthing link placed on the bottom.

All connections use plugs to which wires are xed by means of screw clamps or spring clamps.

The distribution of connectors is presented on Figure2.1. Description of functions of dierent connectors is included below
in the manual.

11

LB-762 Controller Installation Manual LAB-EL

Rysunek 2.1: Connectors of regulator LB-762

2.2 Signaling LEDs

On main plate of the regulator (in the rear part of the casing) there are several light diodes, which are supposed to signal
regulator status. The function of these diodes is above all to provide a diagnostic tool – they are important mostly at the time
of installation and start-up, later while normal operation access to them is not required. All signaling elements important

12

LB-762 Controller Installation Manual LAB-EL

during daily operation are located on the front panel of the regulator casing.

The following LEDs are available:

RDY

regulator readiness to work

ETHERNET LNK

Ethernet connection (LED out - no connection, LED on - connection active)

ETHERNET ACT

data transmission through Ethernet interface (each LED ash is associated with data receipt or transfer)

ETHERNET SPD

data transmission speed through Ethernet interface (LED out – 10 MBit/s, LED on - 100 MBit/s)

BELIMO MP

data transmission through interface of servomotors BELIMO MP (each LED ash is associated with data receipt or
transfer)

RS-485 RX

receipt of data through RS-485 interface

RS-485 TX

sending of data through RS-485 interface

S300 #1

data transmission through interface S300 no. 1 (each LED ash is associated with data receipt)

S300 #2

data transmission through interface S300 no. 2 (each LED ash is associated with data receipt)

2.2.1 Errors in operation

Errors in operation of the regulator are signalled both on the display on the the front panel as well as by means of signaling
diodes on the main plate of the regulator (possible is e.g. regulator failure condition which does not permit display of the
relevant announcement on the displays, in such case the only possible signaling is by means of diodes on the plate).

Errors are announced as follows:

2.2.1.1 Front panel

On the main display located on the front panel the message is displayed SOSXXXX, where XXXX may have dierent numeric
values, denoting the error code.

ALARM diode and buzzer (sound signaling) broadcast SOS message in the Morse alphabet.

2.2.1.2 Signaling LEDs on the main plate

The following LEDs are used to signal failure: RDY, ETHERNETLNK, ETHERNETACT and ETHERNETSPD. LEDs
ash in cycles broadcasting SOS message in the Morse code, similarly to the signalling on the front panel. The error code is
characterized by a combination of diodes which ash and which remain o.

13

LB-762 Controller Installation Manual LAB-EL

Rozdział 3

Connectors description

3.1 Mains supply

Mains supply connector is described as AC230V and is in the middle of the lower edge of the regulator’s main plate. The
regulator IS NOT equipped with its own power supply switch, what means that an external mechanism must be provided
for mains power supply shutdown.

Connection contacts are described as N and L, what means Neutral (zero wire, blue color) and Live (phase wire, brown color).
Maintaining appropriate sequence of connecting wires N and L is not vital for correct operation of the machine, however, it
is highly recommended owing to preservation of the convention and elegance of the installation.

3.2 Earthing

Connector of earth is described as EARTH and is located on the left side of the mains supply connector.

Earthing should be running in a separate, dedicated cable in color green-yellow (in accordance with appropriate standards),
with eye tip phi 4mm, screwed down in the regulator to the screw clamp EARTH and connected outside to the respective
earth.

Caution

To ensure safety of use, proper operation of the regulator and immunity to interference, it is necessary to ensure
appropriate connection of the earth clamp!
IT IS NOT allowed to connect the earth clamp to contact N of the power supply connector ! Separate earthing is
required.

3.3 Measurement probes

LB-762 regulator is equipped with a number of inputs, ensuring attachment of the following probes:

• 2 psychrometers,

• 4 temperature probes of air-conditioning tunnel,

• 6 base temperature probes,

• 1 extra universal temperature probe.

3.3.1 Psychrometers

LB-762 regulator may cooperate directly with two psychrometers. When connected only to one psychrometer, it is used for
measurement of temperature and humidity in the cultivation hall. The second psychrometer may be used also for measurement
of temperature and humidity in the hall - in such case the regulator averages results from both measuring points, providing
greater independence of measurement from the gradient of temperatures and humidity in the cultivation hall. The second
psychrometer may also be used for other purposes, such as e.g. measurement of air parameters on the outlet of air-conditioning
tunnel. The basic psychrometer should be connected to input #1.

Psychrometer connectors are marked as:

• PSYCHROMETER#1,

• PSYCHROMETER#2.

Each of the psychrometers is attached using three wires:

• DRY - dry thermometer,

• GND - common wire (ground),

• WET - wet thermometer.

14

LB-762 Controller Installation Manual LAB-EL

Rysunek 3.1: Scheme of psychrometer connection

3.3.2 Thermometers

For connecting temperature probes the following connectors are used:

• TEMP.SENSORAC#1 - the thermometer of air-conditioning tunnel no. 1 (behind the heater),

• TEMP.SENSORAC#2

- the thermometer of air-conditioning tunnel no. 2 (behind the cooler),

• TEMP.SENSORAC#3 - the thermometer of air-conditioning tunnel no. 3 (additional),

• TEMP.SENSORAC#4 - the thermometer of air-conditioning tunnel no. 4 (additional),

• TEMP.SENSORCOMP#1 - base thermometer no. 1,

• TEMP.SENSORCOMP#2 - base thermometer no. 2,

• TEMP.SENSORCOMP#3 - base thermometer no. 3,

• TEMP.SENSORCOMP#4 - base thermometer no. 4,

• TEMP.SENSORCOMP#5 - base thermometer no. 5,

• TEMP.SENSORCOMP#6 - base thermometer no. 6,

• TEMP.SENSORAUX#1 - additional thermometer.

Each of temperature probes is attached using two wires:

• T - temperature sensor,

• GND - ground.

Rysunek 3.2: Scheme of connection of temperature probe

15

LB-762 Controller Installation Manual LAB-EL

✁✂

✁✂

✄

☎✆✝✝

✞✟✠✠✡

☎✆✝✝

3.4 Analog input 0-10V

Analog input 0-10V is described as INPUT0-10V. To this input one can attach any source of signal within the measuring
range 0-10V, e.g. CO concentration meter2.

The connection is done using two wires:

• U - signal input,

• GND - ground.

3.4.1 Connection of analog CO2concentration meter

Figure3.3 presents a scheme of connection of CO concentration meter2type FUJI ZFP9. Another type of meters are
connected in the same manner. After meter connection to the analog input 0-10V one should adequately congure the
regulator so that it could read data from the meter. One should indicate the place of connection of the meter and the type
of meter – additionally, individual calibration can be made of the particular meter.

Rysunek 3.3: Scheme of connection of FUJI ZFP9 type meter

3.5 Inputs of S300 measurement sensors

LB-762 regulator is equipped with two inputs permitting attachment of any S300 sensors, extending measurement possibilities
of the regulator. In typical cases these are concentration meters CO2LB-850 or hytherographs LB-710.

For connecting sensors the following connectors are used:

• S300#1 - sensor input no. 1,

• S300#2 - sensor input no. 2.

The connection is done using two wires that they provide power supply to the meter and are used for data transmission:

• ”+” - power supply,

• GND

S300 interface is a current loop which permits any polarization of the attached sensor, thus the manner of connection
(sequence of wires) does not have any importance here.

3.5.1 Connection of CO2concentration meter type LAB-EL LB-850

Figure3.4 presents a scheme of connection of concentration meter CO2type LAB-EL LB-850. The meter can be attached
to any of the two S300 inputs which LB-762 regulator is equipped with. After connection of the meter to S300 input it is
necessary to properly congure the regulator, so as to ensure that it could use measurement data from the S300 input.

- ground.

Rysunek 3.4: Scheme of connection of LAB-EL LB-850 type meter

16

LB-762 Controller Installation Manual LAB-EL

✁✂

✄

☎✆✝✝

✞✟✠✠✡

☎✆✝✝

3.5.2 Connection of hytherograph type LAB-EL LB-710

Figure3.5 presents a scheme of connection of hyterograph type LAB-EL LB-710. The meter can be attached to any of the
two S300 inputs which LB-762 regulator is equipped with. After connection of the meter to S300 input it is necessary to
properly congure the regulator, so as to ensure that it could use measurement data from the S300 input.

Rysunek 3.5: Scheme of connection of LAB-EL LB-710 type meter

3.6 Relay outputs

LB-762 regulator is equipped with 8 relay outputs, used to control any executive devices. For connecting executive devices,
the following connectors are used:

• RELAY#1 - relay no. 1 (contact),

• RELAY#2 - relay no. 2 (contact),

• RELAY#3 - relay no. 3 (contact),

• RELAY#4 - relay no. 4 (contact),

• RELAY#5 - relay no. 5 (contact),

• RELAY#6 - relay no. 6 (contact),

• RELAY#7 - relay no. 7 (contact),

• RELAY#8 - relay no. 8 (contact - no contact).

Relays 1-7 are shorted, contacts are marked as N.O. (what means inactive condition ”Normally Open” – normally no contact).
Switching on the relay causes short circuit of output contacts.

Relay no. 8 is of contact-no contact type, pairs of contacts are marked as N.O. (what means inactive condition ”Normally
Open” – normally no contact) and N.C. (what means inactive condition ”Normally Closed” – normally contact). One contact
is common. Switching on the relay causes short circuit of output contacts N.O. and opening of contacts N.C.

Relay outputs are completely insulated galvanically from all other connectors, in particular from the mains supply. This
means that these relays can control any circuits, independently of existing voltages. In any case external power supply is
required to the executive device – the regulator does not emit voltage on relay outputs.

3.6.1 Connection of OPEN-CLOSE 230V valve

Figure3.6 presents a scheme of connection of a typical valve to the relay output. External connection is required of power
supply voltage (the regulator does not emit power supply on relay outputs), additionally, it is necessary to use an appropriate
fuse protecting the circuit against short-circuit.

Rysunek 3.6: Scheme of connection system of a typical valve to relay output

17

LB-762 Controller Installation Manual LAB-EL

3.7 Outputs of analog servomotors

LB-762 regulator is equipped with 8 connectors used for connection of analog servomotors. The outputs permit control of
any servomotors which accept control signal within the range 0-10V or 2-10V. Apart from control of servomotor it is also
possible to connect return signal from servomotor, informing about the current position of the servomotor. Scope of voltages
of return signal is analogous to the control output: 0-10 or 2-10V. The return signal is used by the regulator to control
correct operation of the servomotor (check whether the servomotor is set in accordance with the preset control signal). If the
servomotor has no return signal output or is not used in the given installation, one should make the connection according to
Figure3.9.

Connectors of regulator LB-762 intended for cooperation with servomotors are marked as follows:

• ACTUATOR#1 - servomotor no. 1,

• ACTUATOR#2 - servomotor no. 2,

• ACTUATOR#3 - servomotor no. 3,

• ACTUATOR#4 - servomotor no. 4,

• ACTUATOR#5 - servomotor no. 5,

• ACTUATOR#6 - servomotor no. 6,

• ACTUATOR#7 - servomotor no. 7,

• ACTUATOR#8 - servomotor no. 8.

3.7.1 Servomotor power supply

LB-762 regulator does not supply power to servomotors – servomotors require a separate source of power supply. The manner
of power supply depends on the type of servomotors. Popular BELIMO servomotors can be powered with voltage 24VAC
or 24VDC, Johnson Control servomotors require only 24VAC power supply.

For 24VAC power supply the so-called safety transformer can be used 230V/24V, one should however ensure proper anti­shorting protection.

The power supply unit can be one common for all servomotors – it must however ensure appropriate current eciency (one
should calculate the sum of input power by all servomotors and depending on this power accordingly select ecient power
supply). Conguration is also possible in which each servomotor has its own individual power supply.

If both analog and digital servomotors are used in the system, their common power supply is possible – see description of
digital servomotor power supply, found below in the manual.

3.7.2 Connection diagrams - actuator with analog input

3 contacts are provided for connection of each servomotor:

• IN - return signal input informing about position of the servomotor,

• OUT - control signal output xing servomotor position,

• GND - ground.

GND contact is present on each of the connectors, but this is a common signal without galvanic insulation between dierent
connectors, what can be use to possibly simplify cabling.

Figure3.7 and Figure3.8 present typical connection diagrams for Belimo and Johnson Control servomotors.

18

LB-762 Controller Installation Manual LAB-EL

✁

✂✄☎

✆✁✝

✁

✂✄☎

✆✁✝

✁

✂✄☎

✆✁✝

✞✟☎✄✞☎✂✠

✡☛

✞✟☎✄✞☎✂✠

✡

☞

✞✟☎✄✞☎✂✠

✡

✌

☛

☞

✍

✎

✏✑✒

✏✓✒

✏✔✒

✏✄✒

☛

☞

✍

✎

✏✑✒

✏✓✒

✏✔✒

✏✄✒

☛

☞

✍

✎

✏✑✒

✏✓✒

✏✔✒

✏✄✒

✕

✖✞✗✑✘✖ ✖✗ ✑✙✚

☞

✟✂✁☎✠✂

✖✖✘

✠

✛✂✜✘✠✢✄✛✛✖

✔

✞✟ ☞

✣✤

✥✦

✝✟ ☞

✣✤

✧★ ✩✥ ✌ ✪✫✩✧✪✩✥✦✬

✁

✂✄☎

✆✁✝

✁

✂✄☎

✆✁✝

✁

✂✄☎

✆✁✝

✞✟☎✄✞☎✂✠

✡☛

✞✟☎✄✞☎✂✠

✡

☞

✞✟☎✄✞☎✂✠

✡✌

✍

✎

✄

✏✑✞✟

✏✑✝✟

✏✒✓

✏✟✂✔

✍

✎

✄

✏✑✞✟

✏✑✝✟

✏✒✓

✏✟✂✔

✍

✎

✄

✏✑✞✟

✏✑✝✟

✏✒✓

✏✟✂✔

✍

✕✞✓✖✗✕ ✕✓✖ ✘✙☞

✟✂✁☎✠✂✕✕✗✠

✚✛✠ ✜✄✚✚✕✎

✞✟ ☞✢✑

✣✤ ✥✦✌✧★✥✣✧✥✦✩✪

✁

Rysunek 3.7: Scheme of connection of analog servomotors Belimo

Rysunek 3.8: Scheme of connection of analog servomotors Johnson Control

For servomotor which does not have a return signal, one should short-circuit contacts IN and OUT in the given connector
of regulator LB-762 in accordance with gure Figure3.9. Such connection will ensure ”cheating” of the regulator as to
compliance of the set and the actual servomotor position and shall prevent alert signalling of servomotor failure.

Rysunek 3.9: Scheme of connection of analog servomotor without return signal

19

LB-762 Controller Installation Manual LAB-EL

3.7.3 Connection diagrams - actuator open-close

For open-close actuator control, 2 separate relay outputs are used. First relay controls ”open” action, the second one controls
”close” action. Both relays must be properly congured in controller.

Using the same method, one can control engine, instead of actuator. Additional external circuitry is required, to properly
switch engine rotation direction.

Rysunek 3.10: Scheme of connection of open-close actuators

3.8 Bus of digital servomotors BELIMO MP-BUS

LB-762 regulator is equipped with one connector used for connection of a bus of digital servomotors consistent with BELIMO
MP-BUS standard. By means of this bus the regulator permits operation of 1 servomotor congured in PP mode or from 1 to
8 servomotors in MP mode. The key advantage of MP-BUS bus as compared with analog controlled servomotors is important
simplication and reduction in the quantity of cabling (instead of 3 separate ducts from each servomotor to the regulator
only 3 wires are conducted in parallel to each servomotor), better diagnostics (the regulator is able to detect lack of correct
communication with the servomotor – e.g. in consequence of damage of servomotor, power supply unit or cabling) and more
precise servomotor positioning and reading of its actual position (digital data transmission resistant to interference).

For cooperation with MP-BUS bus suitable servomotors must be used, consistent with this standard. Before connection to
the system they require conguration – address setting. Default, factory servomotor setting permits operation in PP mode
(permitting communication only with one servomotor), use of a greater number of servomotor requires assignment of an
individual address to each one. Servomotor address setup procedure is described further in the manual.

MP-BUS bus is galvanically insulated from all other connectors of LB-762 regulator, in order to ensure greater immunity to
interference created by digital data transmission.

3.8.1 Servomotor power supply

LB-762 regulator does not supply power to servomotors – servomotors require a separate, own source of power supply 24VDC
or 24VAC (BELIMO servomotors can be powered by both direct and alternate current). In the case of AC power supply
polarization of power supply does not have any importance here, for DC power supply attention should be paid to correct
polarization (see scheme of connections).

The power supply unit can be one common for all servomotors – it must however ensure appropriate current eciency (for
example for digital servomotor LM24A-MP maximum power consumption is 3W, what means 24W with 8 servomotors peak
power consumption; depending on the number and type of servomotors used appropriate power supply eciency should be
considered).

For a system using both analog and digital servomotors, it is also possible to provide their common power supply from
one power supply unit - in such case one should connect contact GND of connector BELIMOPP/MP with contacts GND

20

LB-762 Controller Installation Manual LAB-EL

of joints of analog servomotors (ACTUATOR#N), as there is no connection between these contacts inside the regulator
(galvanic insulation).

24VDC power supply to servomotors has the advantage of permitting longer connecting cables than 24VAC power supply
– see the description below. However, it must be quite well ltered out – the amplitude of pulsations cannot be higher than
10%.

3.8.2 Connecting cable

MP-BUS bus imposes some restrictions as to the length of cabling and section of wires. While the type of cable has no
greater importance (it does not have to be screened, simplest 3-conductor cable is sucient), , depending on the type of
power supply (AC/DC), the number of servomotors and the section of the connection cable, dierent is the maximum
acceptable cable length. Detailed information on the method of setting the maximum connection cable length can be found
in the documentation of Belimo, below presented are the most typical cases for cable with core section 0.75mm2and popular
types of servomotors.

consumed power power supply 24V AC power supply 24V DC

20W/VA 25m 40m
40W/VA 15m 20m
60W/VA 8m 10m

Tabela 3.1: Maximum cable length for section 0.75mmmm

2

One should sum up power collected for all connected servomotors. For example for servomotor LM24A-MP consumed power
is 2.5W for 24VDC and 5.0VA for 24VAC. With 8 servomotors we have the sum of powers 20W for 24VDC and
40VA for 24VAC, what permits application of cable with length respectively 40meters at supply 24VDC and 15meters
at supply 24VAC.

In special cases when larger distances are required, double increase in the cable section up to 1.5mm2permits twofold
growth in these distances.

In the case when each servomotor has its own power supply located in the neighborhood of the servomotor, connection
of MP-BUS bus with LB-762 regulator can be made by two cables. In such case cable length is restricted to 800meters,
regardless of its section (it is not however recommended to use cable with section smaller than 0.75mm2).

3.8.3 Connections diagram

Connector of LB-762 regulator used for connection of MP-BUS bus is described as BELIMOPP/MP and is equipped with 2
contacts:

• MP - signal,

• GND - ground.

Figure3.11 presents the typical manner of connection of MP-BUS bus, using additional common 24V power supply unit.

The manner of laying the cable between LB-762 regulator, the power supply unit and servomotors has no importance here.
It can be running in any convenient way, this may be a layout of bus, star, mixed or any other.

More details concerning MP-BUS bus and its technical parameters can be found in BELIMO documentation.

21

LB-762 Controller Installation Manual LAB-EL

Rysunek 3.11: Scheme of connection of bus of servomotors BELIMO MP-BUS

3.8.4 Setting of servomotor addresses

Factory standard setting of BELIMO servomotor is operation in PP mode, which allows connection of only one servomotor
to MP-BUS bus. Operation in MP mode allows connection of 1 to 8 servomotors, but requires setting of individual addresses
for the servomotors, so as to ensure that the regulator could communicate with each servomotor independently of the others.
In PP mode one can also connect a servomotor with set MP address, however, the address is then used and the servomotor
operates always independently of the set address.

For proper cooperation of LB-762 regulator with digital servomotors BELIMO MP-BUS one should correctly congure both
the servomotors and the regulator itself, according to the used operation mode of the servomotors (PP or MP with addresses).

The conguration of servomotor addresses can be done in several ways:

• ordering appropriate conguration settings from the producer – not quite practical method, as the conguration has to
be xed at the order,

• BELIMO conguration tools – such as MFT-H programmer or interfaces ZIP-RS232, ZIP-USB-MP, ZIP-232-MP, ZIP-232­KA plus dedicated Belimo PC-Tool MFT-P conguration software; description the method of conduct is in the respective
documentation of Belimo,

• conguration procedure built in LB-762 regulator – this method is described below.

LB-762 regulator software permitting conguration of addresses of attached servomotors. Individual connection of each
servomotor is not required - the conguration can be made after completing full installation with all servomotors. The
servomotors must have power supply on and must be respectively connected to the regulator.

Important

The necessary condition for correct operation of servomotors is to assign individual addresses to them. Each MP-BUS
servomotor attached to the particular regulator must have a unique address!

The procedure below applies to one servomotor, it should be repeated for each installed servomotor:

• enable programming of the regulator (PROGRAMMING button on remote control, specify the respective regulator num­ber),

• go to advanced settings menu (button PASSWORD, enter correct password – this is normally 1111),

• choose MP-BUS servomotor addressing function (button B),

• at any moment use button BACK to cancel the procedure of servomotor address setup,

• in response to message MP-BUS addr = enter the required servomotor address (1 to 8),

22

LB-762 Controller Installation Manual LAB-EL

✁✂

• the regulator will display the blinking hint SET ACT, in response to which the address setting should be conrmed in the
desired servomotor – the procedure depends on the type of servomotor.

Possible are the following options (more information can be found in the Belimo documentation):

– servomotors...-MP: after switching on the address setup procedure on servomotor the yellow indicator should regularly

ash; to conrm the address press this control (it is at the same time a button) and hold until the address is conrmed
(control o and address conrmation on the regulator),

– servomotors LM,NM,AM,GM...-MFT(2): push disengagement button only once, hold it pressed until the address is

conrmed on the regulator,

– servomotors LF,AF...-MFT(2): over less than 5 seconds change twice the position of sense of rotation switch (L/R),
– servomotors NV,NVF,AV...-MFT(2): after switching on the address setup procedure on servomotor indicator H1 should

ash (alternately red and green); to conrm the address press S2 button only once, hold it pressed until the address is
conrmed on the regulator.

• after conrming the address the regulator should display message SET ACT without ashing, what means conrmation of
correct address setting. If the regulator displays message Err, this means an error in communication with the servomotor
– try to repeat the operation. If the error persists, this means a problem in communication with the servomotor –
check the connections as well as the possibility of address collision with other servomotors. In such situations immediate
disconnection can help of the other servomotors and conduct of the address setting procedure with a single servomotor
connected. Continuous ashing of announcement SET ACT and no reaction to conrm the address in servomotor means
no communication with the servomotor – check the correctness of all connections,

• after setting the servomotor address, use button NEXT to go to address setup for the next servomotor, or use BACK
button to end the address setup procedure.

3.9 Analog outputs 0-10V

LB-762 regulator is equipped with two analog outputs 0-10V, marked as follows:

• OUTPUT0-10V#1 - output no 1,

• OUTPUT0-10V#2 - output no 2.

For connection of device 2 contacts are provided:

• U - voltage signal 0-10V,

• GND - ground.

Both outputs are insulated galvanically from all other signals, as well as from each other. They are designed for cooperation
with devices generating an elevated level of interference as e.g. inverters controlling engine rotations. Of course it is possible
to use these outputs for any other purposes – they are universal and can be used for connection of any device that is subject
to control by signal 0-10V (or 2-10V).

Rysunek 3.12: Scheme of connection of frequency converter type OBRUSN PC3.., OBRUSN PC4.., SSD Drives 605, SSD
Drives 650 and similar

3.10 Ethernet network

RJ45 type connector is used for connection with other network devices by means of cable-spiral, according to standard
10BASE-T and 100BASE-T. In order to obtain as high immunity to interference as possible, for connection use high quality
cable Cat 5 or Cat 5e. The maximum acceptable length of a single connection is 100m (from one device to the other, namely
e.g. from regulator to switch).

23

LB-762 Controller Installation Manual LAB-EL

3.10.1 Conguration example

When using Ethernet network for controllers and PC connection, it’s necessary to properly congure IP addresses. Below
is a sample conguration, assuming usage of private IP address range. It’s typical conguration for standalone system,
when there’s no need for routing between regulators and control software via other networks. Figure1.3 presents connection
diagram for such simple system. 192.168.100.0 network address will be used, preventing conicts with most popular 192.168.1.0
network, if one is already in use. Static addresses will be assigned to network nodes - autoconguration with BOOTP/DHCP
protocols is not used.

• regulators #1..99: addresses 192.168.100.1 .. 192.168.100.99

• komputer PC: 192.168.100.100

• optionally additional router (ex. to Internet): 192.168.100.254

Subnet mask: for all network nodes it’s the same: 255.255.255.0

Default gateway: if router is present in the network, its address should be used (192.168.100.254), otherwise gateway address
doesn’t matter - regulators can be set with 0.0.0.0 address, or PC address (192.168.100.100).

Proper settings (IP address, subnet mask, gateway) should be set for every network node (regulators, PC, router) - but every
device gets it’s own unique IP address. Subnet mask and gateway address are the same for all nodes.

Regulator address settings can be applied using lbnetcfg tool, PC with Windows operating system requires changes to network
card settings, under TCP/IP protocol properties.

3.11 RS-485 network

The connector described as RS-485 is used to connect LB-762 regulator to RS-485 network, serving for communication with
an appropriate IT system (PC computer and appropriate software).

For connection of RS-485 network 3 contacts are provided:

• A - signal,

• B - signal,

• GND - ground.

RS-485 bus is galvanically insulated from all other signals.

In order to obtain as high immunity to interference as possible, for RS-485 network connection use two-pair screened spiral,
with minimal wire section 0.2mm2. One pair of wires should be connected to contacts A and B, the second pair together
with the screen connected to contact GND.

Total length of RS-485 network may be max. 1200 meters.

Figure3.13 presents the manner of RS-485 network connection. The Connecting cable must be laid from one device to the
next one, branching must be directly on connecting clamps – on the diagram points marked with dots.

Numbers of contacts described for RS-485 connector of LB-480 module relate to plug type DB9M, which should be used for
connecting LB-480 module.

Figure3.14 presents two examples of RS-485 network topologies. A properly laid network conducts in one cable from one
device to the other device. Incorrectly laid network has branching of cable – such placement of network is unacceptable!

Rysunek 3.13: Scheme of RS-485 network connection

24

LB-762 Controller Installation Manual LAB-EL

Rysunek 3.14: Scheme of correct and incorrect RS-485 network topology

3.11.1 Termination of RS-485 network

RS-485 bus requires relevant termination (impedance match and line polarization). Termination of network should be con­nected only in two places - on the ends of the network. This means these devices (network nodes) to which cable comes
and does not go further to next devices. On Figure3.13 termination should be enabled in devices described as LB-762 #1
(extreme device on the left side) and LB-480(extreme device on the right side). In other devices, located in the middle part
of the network, termination of the network must be o.

In LB-480 regulator 3 switches are used for network termination, described as RS-485TERMINATION (Figure2.1):

• POL+ - polarization (+),

• POL- - polarization (-),

• TERM - impedance match.

Rysunek 3.15: RS-485 network termination switches

Switches in the lower position are o, while in the top position – on.

In practice switching on termination means switching on of all 3 switches, while turning o termination means turning o
of all 3 switches. The situation is theoretically possible in which switch TERM or pair POL+ and POL-, but in practice it
is not present.

RS-485 interface in converter LB-480 has similar termination mechanisms of RS-485 network. This can be done using 3
contacts which can be found on the interface plate (available after removing the housing), described as LINE TERMINATION.
In order to turn on termination of line in converter LB-480 one should set up all 3 contacts:

• JP1 -POL+ - polarization (+),

• JP2 -POL- - polarization (-),

• JP3 -TERM - impedance match.

It is recommended that LB-480 converter be the terminal machine in RS-485 network (thereby that line termination be
switched on in it). Of course possible is such network topology in which LB-480 converter is a device placed in the middle
part of the network – in such case termination must be in other devices and this is a completely correct conguration. However,
positioning LB-480 converter on the end of the network and switching on termination in it ensures correct operation of the
network in the case when other equipment (regulators) may be periodically deactivated – in such case the disabled regulator
does not ensure line polarization. Since LB-480 converter is a device which by principle of system operation is always on,
switching on termination and polarization of line in LB-480 is the most eective way of ensuring proper RS-485 network
operation. However, this requires proper network planning so that this device be placed on its end.

25