Spector GESTRA SRL 6-40 a User manual

1
EN
English
Logic Unit
SRL 6-40 a
Original Installation Instructions
818957-04

2
Contents
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
ATEX (Atmosphère Explosible).................................................................................................................4
Note on the Declaration of Conformity / Declaration by the Manufacturer ..........................................4
Important Notes
Page
Explanatory Notes
Scope of supply......................................................................................................................................5
Description .............................................................................................................................................5
Function ............................................................................................................................................. 6-7
Equipment approved for operation with logic unit SRL 6-40....................................................................8
Connecting limit switch and relay output terminal.................................................................................12
Bus cable, cable length and size ...........................................................................................................12
Attention...............................................................................................................................................12
CAN bus voltage supply ........................................................................................................................13
Wiring diagram for logic unit SRL 6-40 a......................................................................................... 13, 14
Tools.....................................................................................................................................................13
Electrical Connection
SRL 6-40 a..............................................................................................................................................9
Name plate / Marking ...........................................................................................................................10
Dimensions...........................................................................................................................................11
Technical Data
Installing logic unit SRL 6-40 – 1..........................................................................................................12
Installation
Control units NRS 1-40.1, NRS 1-40.2 ..................................................................................................15
Setting the Control Units
Factory setting......................................................................................................................................15
Basic Settings

3
Switching equipment on .......................................................................................................................16
Interval time .........................................................................................................................................16
Standby time ........................................................................................................................................16
Purging time.........................................................................................................................................17
Purging........................................................................................................................................... 17-18
Stop......................................................................................................................................................18
Special function....................................................................................................................................18
Test ......................................................................................................................................................19
Monitoring ............................................................................................................................................19
Power failure, restoration of power supply ............................................................................................19
Start, Operation, Alarm and Test
Start window ........................................................................................................................................20
Date and time ......................................................................................................................................20
Language .............................................................................................................................................21
IP address ............................................................................................................................................21
Setup....................................................................................................................................................22
Password..............................................................................................................................................22
Setting the control unit, number of level electrode and type of installation.............................................23
Setting the interval and standby times ..................................................................................................23
Settings
Contents – continued –
Page
Setting the control unit, number of level electrode and type of installation.............................................24
Messages
Decommissioning .................................................................................................................................25
Disposal................................................................................................................................................25
Decommissioning Procedure and Disposal
TÜV Confirmation............................................................................................................................ 26-27
Annex

4
Important Notes
Usage for the intended purpose
Use the logit unit SRL 6-40 only in conjunction with external low-water (LW) level limiters or
high-water (HW) alarms for monitoring the independent purging process of the connecting lines for
the measuring pot.
Safety note
The equipment must only be installed and commissioned by qualified and competent staff. Retrofit-
ting and maintenance work must only be performed by qualified staff who – through adequate training
– have achieved a recognised level of competence.
ATEX (Atmosphere Explosible)
According to the European Directive 2014/34/EU the equipment must not be used in potentially explo-
sive areas.
Note on the Declaration of Conformity / Declaration by the Manufacturer
For details on the conformity of our equipment according to the European Directives see our Declaration
of Conformity or our Declaration of Manufacturer.
The current Declaration of Conformity / Declaration of Manufacturer are available in the Internet under
www.gestra.com Documents or can be requested from us.

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Explanatory Notes
Scope of supply
SRL 6-40 a
1 Logic unit in field case for wall mounting
1 Installation & operating manual
Description
If the LW / HW level electrodes are installed in external measuring pots, the periodic purging process
of the connecting lines is imperative. Each measuring pot requires its own logic unit.
For purging the connecting lines are isolated one after the other and then opened again and the meas-
uring pot is drained.
The logic unit SRL 6-40 monitors the maintenance of the specified times and the sequence of the valve
operations. In order to prevent deactivation of the equipment during the purging process, the associated
control unit will ignore the corresponding level information of the level electrode LW.
The logic unit SRL 6-40 is designed for use with the compact equipment Micro Innovation XV200.
It consists of a touch screen with embedded HMI-PLC. The equipment uses Windows CE and features
32 MB RAM, Flash for data/program memory and a maintenance-free battery-backed real time clock.
This equipment in conjunction with the WAGO I/O system 750 represents the logic unit SRL 6-40.
Its design is in accordance with EN 50156 and the data exchange is effected via CAN bus using the
CANopen protocol.

6
Explanatory Notes – continued –
Function
Fig. 1 shows a water level limiting system using a level electrode installed inside the boiler and a
second electrode installed in an external level pot. However it is also possible to install 2 external level
electrodes NRG 1x-4x, 2 logic units SRL 6-40, 1 level switch NRS 1-40.1, NRS 1-40.2.
The logic unit and the control unit monitor the following times:
Interval time: This is the time interval at which, depending on the operating mode
(24h / 72h operation), the connecting lines have to be purged.
Standby time: The purging process must be initiated during this time. The standby period
begins when the interval time has elapsed.
Purging time: During this period the valves must be operated so as to initiate the purging process.
Operation of the valves and exposure of the LW level electrode is sensed and signalled by the limit
switches. If a message is not received during the purging time, the safety circuit will be interrupted.
The monitoring of the purging time is a safety-relevant function because a water level limiter may be
bypassed for a maximum of 5 minutes.
Logic unit SRL 6-40
Every second the logic unit SRL 6-40 sends the following telegram: “Availability message SRL 6-40” to
control unit NRS 1-40.1, NRS 1-40.2. The logic unit creates the time basis for the purging interval times
and monitors the compliance of the purging intervals. After the interval time has elapsed the standby time
is started and the interval time is reset to its initial value. During the standby time the purging process
must be started.
If the standby time is exceeded, the logic unit sends the command “Open safety circuit” and
“Evaluate limiter signal of LW level electrode 1 (2)” to the control unit. The beginning of the purging
process is detected when the valve D or E leaves the limit switch OPEN.
When the purging is started the telegram “Ignore limiter signal from LW level electrode 1 (2)” is sent,
and when the purging stops the telegram “Evaluate limiter signal from LW level electrode 1 (2)” is sent
to the control unit.
Fig. 1
-
D
E
F
SSB-WD SSB-WD
Logic unit SRL
6-40
Control
unit Safety circuit

7
Explanatory Notes – continued –
Function – continued –
If the purging time (5 min.) is exceeded, the logic unit sends the command “Open safety circuit” and
“Evaluate limiter signal of LW level electrode 1 (2)” to the control unit. The command will only be cancelled
when the purging process is successfully finished.
If an external high level alarm is monitored, the signals of the HW level electrode will not be evaluated.
If a purging process is initiated outside the standby time, the interval time will be reset. The factory set
interval time (24h or 72h) is stored on a CF card. This also applies to the standby and the purging time.
These settings are shown at the display of the logic unit.
The corresponding menu of the logic unit enables you to select the control unit with which the logic
unit shall communicate and the level electrode to be monitored. Observe the following specification:
Control unit ID control unit ID level
electrode 1 ID SRL ID level electrode 2 ID SRL
NRS 1-40
NRS 1-40.1 1 2 4*) 3 5*)
NRS 1-41
NRS 1-40.2 6 7 9*)
*) The software automatically allocates the node ID to the SRL when the control unit (see page 23) is selected.
Control units NRS 1-40.1, NRS 1-40.2
In conjunction with the logic unit the control units process the following telegrams:
“Open safety circuit”
“Ignore message from LW level electrode 1 (2)”
For max. 5 minutes the control unit will not evaluate the information coming from the level electrode.
If after 5 minutes the telegram “Evaluate message from LW level electrode 1 (2)” is not received, the
control unit will open the safety circuit. The messages of the other electrode remain valid and will
lead to an interruption of the safety circuit in the event of low water level. If purging takes place at
both electrodes at the same time, the control unit will also interrupt the safety circuit.
“Evaluate message from LW level electrode 1 (2)”
The information from the level electrode will be evaluated as usual. The logic unit sends these tel-
egrams after the purging process is finished.
“Availability message of the SRL 6-40, level electrode 1(2)”
If one or two logic units are used in the system, the control unit expects the availability messages of
the logic units every second. If these messages fail to appear, the safety circuit will be interrupted.
The configuration (NRS 1-40.1, NRS 1-40.2) of the control unit during the commissioning procedure
determines, whether one or two logic units are to work with the control unit.

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Equipment approved for operation with logic unit SRL 6-40
Water level limiter (low water), consisting of
Level electrode NRG 1x-4x, control unit NRS 1-40.1
High water level alarm, consisting of
Level electrode NRG 1x-41, control unit NRS 1-40.2
Explanatory Notes – continued –

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Technical Data
SRL 6-40 a
Interface
Interface for CAN bus to ISO 11898, CANopen protocol
Ethernet (RJ 45) for remote operation (optional)
Supply voltage
24 VDC SELV (safety extra low voltage) + 20 % / – 15 %
Inputs
1 four-channel digital input terminal DC 24 V
1 two-channel digital input terminal DC 24 V
for 5 volt-free contacts of the limit switches mounted in valves
Outputs
1 two-channel relay output terminal AC 230 V, DC 30 V
2 make contacts, volt-free, contact rating max. AC/DC 2A
for external indication “Stand-by time running” and “Stop”
Interval time
Factory-set default range: 2 to 336 hours
Standby time
Factory-set default range: 15 minutes to 2 hours
Purging time
Factory setting: 5 minutes
Baud rate
Factory set default (data transfer rate) 250 kbit/s (length of line up to 125 m).
Other baud rates available on request.
Indicators and adjustors
1 touch screen display
Power consumption
10 W
Protection
IP 65 to EN 60529
Admissible ambient temperature
0 – 50 °C
Enclosure
Field case for wall mounting
Case material: polycarbonate, colour: light gray
Cable entry / electrical connection
M 12 male connector, 5 poles, A coded
M 12 female connector, 5 poles, A coded
M 12 female connector, 8 poles, for connecting the limit switches
Weight
approx. 2.1 kg

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VS.-Nr.:xxMat.Nr.:
xxxxxx
10 W
Tamb = 50 °C ( 122°F)
Intervallzeit: Bereitschaftszeit: Spülzeit:
xx h x h x min.
GESTRA AG
Münchener Str. 77, D-28215 Bremen
In / Out : CAN - Bus
IP 65
24V DC
Betriebsanleitung
beachten
See installation
instructions
Voir instructions de
montage
Überwachungs-
logik
SRL 6-40a 1
Technical Data – continued –
Name plate / Marking
CAN bus
specification
Manufacturer
Spare part specification
Safety
note Mains voltage/
Protection
CE marking
Disposal
note
Equipment
designation
Fig. 2

11
Technical Data – continued –
Dimensions
CE marking
t = 165
180
254
Fig. 3

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Installation
Installing logic unit SRL 6-40 – 1
Attention
All bus-based equipment must feature the baud rate setting 250 kbit/s
(with cable length up to 125 m).
If the logic unit has a different baud rate when supplied you have to change the baud rate
settings of the other bus-based devices so that they all feature the same baud rate.
The enclosure of the logic unit is designed for wall mounting and should be installed close to the
external level pot. The four fixing holes are freely accessible after removing the upper part of the
enclosure. The dimensions of the fixing holes are embossed on the back of the case.
Electrical Connection
Connecting limit switch and relay output terminals
The level pot is provided with three shut-off valves. Both valves D and E are fitted with two limit
switches for “OPEN” position (D 1 / E 1) and “CLOSED” position (D 2 / E 2).
The drain valve F is fitted with only one limit switch for the “CLOSED” position.
The limit switches must be provided with volt-free relay contacts.
For connecting the limit switches we recommend a control cable, e. g. Ölflex 110 H, 7 x 1 mm2and the
installation of an intermediate distribution frame (IDF) close to the level pot. For connecting the IDF to
the logic unit a control cable assembly (with connector) is supplied with the equipment.
External indicators for “Stand-by time running” and “Stop” can be connected directly to the relay out-
put terminal. Use the cable gland in the housing for the conntecting cables.
Bus cable, cable length and size
Screened multi-core twisted-pair control cable, e. g. UNITRONIC®BUS CAN 2 x 2 x .. mm2;
Li 2YCY 2 x 2 x .. mm2must be used for the bus line.
Control cable assemblies (with male and female connectors) of various lengths are available as add-on
equipment.
The cable length dictates the baud rate (data transfer rate) between the bus nodes, and the total power
consumption of the sensor dictates the conductor size. Factory set default baud rate: 250 kbit/s
(cable length up to 125 m).

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Electrical Connection – continued –
CAN bus voltage supply
To ensure the troublefree operation of the CAN bus system make sure that the voltage
supply is sufficient.
If the logic unit SRL 6-40 is used, a separate stabilized safety power supply unit
(e. g. SITOP Smart 24 V 2.5 A) must supply the CAN bus with 24 V DC.
The safety power supply unit must be electrically isolated from dangerous contact voltages and must
meet at least the requirements on double or reinforced isolation acc. to DIN EN 50178 or
DIN EN 61010-1 or DIN EN 60950 (safe electrical isolation). The power supply unit must be provided
with an overcurrent protective device in accordance with EN 61010-1/VDE 0411.
Do not connect the CAN bus supply to the control units (terminals 1 and 5).
Wiring diagram for logic unit SRL 6-40 a
3 2 1 5 46 3 4 1 5 2 1Screen
2Voltage supply 24V DC+
3Voltage supply 24V DC–
4CAN data line CH
5CAN data line CL
6Terminating resistor 120 Ω
Male connector Female connector
Connection diagram for the male and female connectors of CAN bus lines
Fig. 4
Tools
Screwdriver for slotted screws, size 2.5, completely insulated according to VDE 0680-1.
Screwdriver for cross head screws, size 2

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Electrical Connection – continued –
Wiring diagram for logic unit SRL 6-40 a – continued –
Fig. 5
Wiring
CAN bus CAN bus
CAN bus
Boiler
Valves:
D = Steam
E = Water
F = Drain
External signals
Stand-by time
running (contact
13/14 closed)
Stop
(contact 23/24
closed)
Two-channel relay output terminal
AC 230 V, DC 30 V, 2 make contacts,
volt-free, max. contact rating AC/DC 2A
Attention
Drawn position of valve limit switches: Valves in normal operating position.

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Setting the Control Units
Control units NRS 1-40.1, NRS 1-40.2
Please configure the control units NRS 1-40.1, NRS 1-40.2 as specified in the following tables:
Control unit NRS 1-40.1
Code switch ELimiting function
S1 S2 S3 S4 S5 S6 1 2 3 4
OFF OFF OFF OFF ON ON Water level LW 1
outside
Logic unit
SRL 6-40
ON ON ON ON OFF OFF Water level LW 1
Inside
Water level
LW 2
outside
Logic unit
SRL 6-40
ON ON OFF OFF OFF OFF Water level LW 1
outside
Water level
LW 2
outside
Logic unit
SRL 6-40 Logic unit SRL 6-40
Control unit NRS 1-40.2
Code switch ELimiting function
S1 S2 S3 S4 S5 S6 1 2 3 4
OFF OFF OFF OFF ON ON High level HW
outside
Logic unit
SRL 6-40
E
Toggle switch, white
Basic Settings
Factory setting
Logic unit SRL 6-40 a
The logic unit features the following factory set default values:
Interval time: 24 hours
Standby time: 1 hour
Purging time: 5 minutes
165
4
32
ON

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Start, Operation, Alarm and Test
Switching equipment on
The interval time starts running once the system is switched on.
The interval time can be synchronized any time by closing one of the connecting valves (E or D), which
means that the purging time starts running and the interval time is reset to its initial value (e. g. 24 h or
72 h etc.).
During operation the standby time will always be started after the interval time has elapsed. The interval
time is immediately reset to its initial value (e. g. 24 h or 72 h etc.).
Interval time
The preset interval time and the remaining runtime are shown in
the start window of the display.
Note: Indication of the level electrode (with ID) with its associated
control unit that is monitored by this logic unit.
Menu:
Starts a test run
Shows the message table
Shows the settings
Standby time
The standby time is indicated by the flashing text line and the
remaining standby time is shown.
The flashing valve symbol prompts the boiler attendant to close
the water valve (E) in order to initiate the purging process.
During the standby time the purging process must be started. The process is started when one
connecting valve (E or D) leaves the final position “OPEN”. If the purging process is not initiated a stop
command will be sent to the control unit (NRS 1-40.1, NRS 1-40.2) after the standby time has elapsed.
The safety circuit will be interrupted.

17
Start, Operation, Alarm and Test – continued –
Purging time
The purging time is indicated by the flashing text line and the
remaining purging time is shown.
The logic units informs the control unit NRS 1-40.1, NRS 1-40.2 via
CAN bus that the purging process has started.
During purging the control unit NRS 1-40.1, NRS 1-40.2 ignores the
signal from the level electrode. The purging time is limited to max.
5 minutes.
The status of the level electrode is shown dynamically.
Purging
Purge the level pot according to the requirements of your installation. For this purpose observe the
following sequence of operations.
Purging
Steam boiler
Purging
Hot-water installation
Purging
Valve D OPEN
Valve E CLOSED
Valve F CLOSED
Purging
Valve D CLOSED
Valve E CLOSED
Valve F CLOSED
Purging
Valve D OPEN
Valve E CLOSED
Valve F OPEN
Purging
Valve D CLOSED
Valve E CLOSED
Valve F OPEN Open vent valve l *).
Purging
Waiting for LW message ..37 sec.
Purging
Valve D CLOSED
Valve E CLOSED
Valve F OPEN
Purging
Valve D CLOSED
Valve E CLOSED
Valve F CLOSED
Purging
Valve D CLOSED
Valve E OPEN
Valve F OPEN
Purging
Valve D OPEN
Valve E OPEN
Valve F CLOSED Close vent valve l *).
Purging
Valve D OPEN
Valve E OPEN
Valve F CLOSED
Purging
Waiting for message “normal water level”
*) Vent valve at level pot (if installed)

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Start, Operation, Alarm and Test – continued –
Purging – continued –
The required sequence of operations are indicated by text or symbols shown on the screen
(open / close; / ).
The purging process is finished when all valves signal that they are in their initial positions.
Specify the type of installation (steam boiler or hot-water plant) when entering the settings.
Stop
The logic units informs the control unit NRS 1-40.1, NRS 1-40.2 via CAN bus if the standby time or the
purging time is exceeded and the safety circuit will be opened.
The flashing STOP message
indicates this deactivation.
For safety reasons the control unit NRS 1-40.1, NRS 1-40.2 monitors simultaneously the purging time
and will also interrupt the safety circuit if the purging time is exceeded. The interruption and the STOP
message will only be undone when the purging process is successfully finished.
Due to the interruption the safety circuit for the heating will be deactivated and interlocked. After the
purging process the interlock must therefore be reset.
Special function
If both level electrodes LW are installed in a level pot outside the boiler, it is not permissible to purge
them both at the same time.
If the second logic unit sends the message “Start purging” to the control unit NRS 1-40.1, NRS 1-40.2
while purging is effected by the first logic unit SRL 6-40, the safety circuit will be interrupted
instantaneously and the red LED for bus status on the the control unit NRS 1-40.1, NRS 1-40.2 will be
illuminated.
This interruption will only stop when the purging process is successfully finished by both devices and
the mains voltage is switched off and switched on again after about 5 seconds.

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Checking the functional chain
Press button “TEST” on the screen of the logic unit to start the purging time outside the interval time.
Hold down the button for at least 3 sec.
The beginning of the TEST run is indicated by the flashing text
messages “TEST” and “Purging time”.
During the TEST run no valve must be operated as this would restart the interval time.
When the purging time has elapsed the safety circuit will be deactivated and interlocked. 10 seconds
later the safety circuit will automatically be switched on again and the interlock can be undone.
A TEST run is not possible during standby time. In this case the functional chain must be checked by
delaying the purging process.
Start, Operation, Alarm and Test – continued –
Test
Monitoring
If the logic unit switches to STOP the data exchange with the control unit will be interrupted.
This means: The safety circuit is interrupted by the control unit NRS 1-40.1, NRS 1-40.2 and the
bridging (if activated) will be cancelled.
Power failure, restoration of power supply
In the event of power failure the data exchange with the control unit will be interrupted.
This means: The safety circuit is interrupted by the control unit NRS 1-40.1, NRS 1-40.2 and the
bridging (if activated) will be cancelled.
If power failure occurs during the interval time, when the power is restored the system will check
whether the time for the next purging process has passed (time stamp for sytem time).
If this is the case, the standby time will be started. The interval time starts again at this point in time.
It must be synchronised again at the desired moment by initiating the purging process.
If power failure occurs during the standby time, when the power is restored the command “Open
safety circuit” will be sent to the control unit. The purging process must be carried out immediately so
that the command can be cancelled.
If power failure occurs during the purging time, when the power is restored the command “Open safety
circuit” will be sent to the control unit. The purging process must be continued and finished so that the
command can be cancelled.

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Press button in the start window to open the following window:
Press touch screen buttons to change the following settings:
Brightness: The setting “Dark” increases the
service life of the backlight considerably!
Date / time: Here you can set the system time.
Additional operating windows will appear.
Language: German or English
IP address: Important for remote operation:
An additional network mask will appear.
Press button in the footer to open the window with SRL specific settings.
Press button to return to the start window.
Settings
Start window
Date / time
When pressing the buttons Hour, Minute or Day an input mask (shown here for Hour) for changing the
data pops up.
<< = –10
< = –1
> = +1
>> = +10
ESC = Escape
RET = Return