Labkotec LID-3300IP User manual

Labkotec Oy
Myllyhaantie 6
FI-33960 Pirkkala, FINLAND
Tel. [phone].2016
Fax [phone] D80186JE-3
Internet: www.labkotec.fi 37 pages
Copyright © 2016 Labkotec Oy 1/37
LID-3300IP Ice Detector
Ice Detector for Wind Turbines and
Meteorological Stations
Installation and Operating Instructions

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 2/37
TABLE OF CONTENTS
SUMMARY OF CHANGES AND NEW FUNCTIONALITY....................................... 3
1PRODUCT OVERVIEW....................................................................................... 4
2INSTALLATION................................................................................................... 5
2.1 Installation and interfaces of LID-3300IP Control Unit................................. 5
2.2 Power supply................................................................................................ 6
2.3 Installation of LID/ISD Ice Sensor................................................................ 6
2.4 Connections between LID/ISD Ice Sensor and LID-3300IP Control Unit.... 7
2.5 Commissioning............................................................................................. 7
2.6 Lightning protection...................................................................................... 8
3LID-3300IP ICE DETECTOR IN OPERATION.................................................... 9
3.1 Operating modes.......................................................................................... 9
3.2 LID-3300IP Front Panel ............................................................................. 10
3.3 Use of different parameter settings............................................................ 10
4SERIAL INTERFACES: RS-232 AND OPTICAL FIBER................................... 11
4.1 RS-232 Terminal Settings.......................................................................... 11
4.2 Serial Output - Streaming Mode Format.................................................... 13
4.3 Serial Output –Measurement and Configuration Menu ............................ 13
5INTERNET WEB ACCESS................................................................................ 17
5.1 Web UI - Header........................................................................................ 18
5.2 Web UI –Status......................................................................................... 18
5.3 Web UI - Raw command input................................................................... 18
5.4 Web UI - Settings....................................................................................... 18
5.5 Direct Web Access between PC and LID .................................................. 21
6TECHNICAL SPECIFICATION.......................................................................... 23
7REPAIR AND SERVICE.................................................................................... 24
8ANNUAL MAINTENANCE................................................................................. 24
APPENDIX A. STREAMING MODE OF SERIAL OUTPUT................................... 25
APPENDIX B. PARAMETERS ............................................................................... 28
APPENDIX C. TERMINAL COMMANDS ............................................................... 31
APPENDIX D. SYSTEM CONNECTION DIAGRAM.............................................. 33
APPENDIX E. EVENT LOG MESSAGES .............................................................. 34
APPENDIX F. FUNCTIONAL SAFETY DATA SHEET........................................... 36
APPENDIX G. DECLARATION OF CONFORMITY............................................... 37
Symbols in this document
Caution, hot surface
Caution, risk of danger

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 3/37
SUMMARY OF CHANGES AND NEW FUNCTIONALITY
The following table describes the latest changes and major new
functionality in LID-3300IP Ice Detector and this user manual.
Changes in LID-3300IP and LID/ISD User Manual
More information in
chapters
Updated parameters P22 = 10 -> P22 = 0, P23 = 80 -> P23 =85
Appendix B.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 4/37
1 PRODUCT OVERVIEW
LID-3300IP (later referred to also as LID or LID Ice Detector) is an ice
detector for wind turbines and meteorological stations. LID-3300IP Ice
Detector consists of LID-3300IP Control Unit and LID/ISD Ice Sensor.
LID monitors the icing weather conditions on-line and reports icing
events through various interfaces. Ice alarm and other measurement
information are available via 2 relay outputs, 2 analog outputs, front
panel, serial output either as RS-232 or optical fiber interface and Web
user interface.
Ice detection of the LID/ISD Ice Sensor is based on an ultrasonic
principle. Ultrasonic signal attenuates when ice is accumulated on the
sensor wire.
By default, LID starts to heat itself after an ice detection to get rid of the
accumulated ice.
Alarm levels and sensor heating, among other functions, can be
controlled by user-configurable parameters. Certain factory parameters
have been defined by the manufacturer, which allow start-up and
operation without any additional definitions.
This manual includes instructions for installation, commissioning and
operating of the LID-3300IP Ice Detector.
Labkotec products are designed to be safe when operated in the
manner described in this manual. The safety of this product cannot be
guaranteed if the product is used in any other way than is specified in
this manual.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 5/37
2 INSTALLATION
2.1 Installation and interfaces of LID-3300IP Control Unit
The enclosure of LID-3300IP is wall-mounted. Mounting holes are
located in the base plate of the enclosure, beneath the mounting holes
of the front cover.
Interfaces and other important components of LID-3300IP Control Unit
are described in the below list and picture.
1. Power
2. Sensor heating
3. Ice Sensor signal
4. Relay outputs
Fault relay (normally energized =
no fault)
5 = normally closed
6 = common contact
7 = normally open
Ice Alarm relay (normally de-
energized = no ice alarm)
8 = normally open
9 = common contact
10 = normally closed
5. Analog outputs (source)
Active current output 1
11 = Iout1+
12 = Iout1-
Active current output 2
13 = Iout2+
14 = Iout2-
6. Not in use at the moment
7. Ethernet RJ-45 connector for
Internet Web access
8. RS-232 / Optical fiber serial
interface selection jumper
9. RS-232 D-connector
10. Main fuse
11. Fuse for sensor heating
12. Fuse for sensor heating
13. Connector for front panel flat
cable
14. Optical fiber converter module
(RS2O). Tx connector (left), Rx
connector (right)
15. USB connector for software
download

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 6/37
2.2 Power supply
The device does not have a mains switch. During maintenance and
service operations it has to be possible to switch off the main supply.
Only an authorized electrician is allowed to install power supply cable
to LID-3300IP control unit.
The installation of power supply can be done by two alternative ways:
- Permanent wiring: using a two pole mains switch (250 Vac 5 A),
which isolates both lines (L1, N). Switch must be installed in the
main power supply lines in the vicinity of LID-3300IP control unit.
Copper wires 1.5 - 2.5 mm2(AWG 16 - 13) can be connected to the
power supply terminal of the control unit.
- Plug connection: using supply cable with plug that can be
disconnect from plug socket when necessary. Remember to tighten
the strain relief of cable gland.
LID-3300IP must always be connected to protective earth (PE).
2.3 Installation of LID/ISD Ice Sensor
The LID/ISD Ice Sensor is designed for mounting on a weather mast.
The preferred place for installation in a wind turbine is on top of the
nacelle. The correct installation position is marked with an upwards-
pointing arrow label.
The sensor should be mounted against the wind so that there is free
airflow in front of the sensor. See the below figure for the preferred
installation direction. Free air distance must be minimum 500 mm.
Avoid installations where there is a possibility that the ice which
accumulates to surrounding structures might reach the sensor.
A standard delivery includes a mounting kit for installing the sensor on
the weather mast. See the figure below. Other mounting options are
also available on request.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 7/37
Flammable materials or materials that may melt are not allowed to
locate close to the sensor.
The sensor body includes a 350W heating resistor. A temperature
sensor T1 (ice sensor temperature) is located in the centre part of the
sensor and temperature sensor T2 (ambient temperature) inside the
connector of the sensor cable. A safety thermostat is also mounted
inside the body of the sensor to break the heating circuit if the sensor
temperature rises above +65 °C.
2.4 Connections between LID/ISD Ice Sensor and LID-3300IP Control Unit
The cables connecting the ice sensor and control unit are included in
the delivery. The standard length of the cables is 10 m.
Only an authorized electrician is allowed to install heating cable
between LID/ISD sensor and LID-3300IP control unit.
NOTE! Additional measures regarding lightning protection might be
needed according to IEC 61400-24. See also chapter 2.6 Lightning
protection.
NOTE! Make sure that high voltage cabling and equipment will not
interfere ice detector system or cabling of ice detector.
2.5 Commissioning
LID-3300IP is ready for operation when sensor and control unit are
connected together and power is switched on in the control unit.
However, it may be useful to do at least the following things right after
the installation.
1. Check device parameters either via web or serial user interface and
make sure they are according to factory settings. Adjust parameters
if needed.
2. Define network settings for internet access via MENU 4 in serial
interface.
3. Set site name via web or serial interface.
4. Generate an ice alarm with test button or cooling spray.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 8/37
2.6 Lightning protection
Lightning protection for LID-3300IP Ice Detector Control Unit and
LID/ISD Ice Sensor shall be done according to standard IEC 61400-24
“Wind turbines – Part 4: Lightning protection” when installed into a wind
turbine.
General principles for protecting ice detector system against
overvoltage in case of lightning strike is presented in the above picture.
Components in the picture are:
1. LID-3300IP Control Unit
2. Surge protection device
3. Automation cabinet
4. Metal tubes
5. LID/ISD Ice Sensor
6. Holder for ice sensor
7. Air termination rod

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
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3 LID-3300IP ICE DETECTOR IN OPERATION
This chapter explains the basic operation of LID-3300IP. Serial and
Web user interfaces are explained in different chapters.
3.1 Operating modes
LID-3300IP operates in different modes which are explained below.
SENSING MODE
LID-3300IP continuously measures the signal level of the ice sensor.
The maximum signal amplitude value can be defined by the user by
parameter 2. By default, the signal value varies between 0 and 100.
Ice signal value is visible in serial and web user interfaces, and
available as continuous current message in the analog output.
ICE DETECTED MODE
When ice signal goes below a defined alarm level (set by parameter 0),
LID goes to Ice detected –mode and gives an ice alarm. The delay of
an ice alarm can be set by parameter 3.
Ice alarm is visible in the Ice alarm LED of the front panel as well as
serial and web interfaces. Ice relay energizes and closes contacts 8 and
9.
Ice alarm and Ice detected mode are active during the Heating and
Cooling phases that follow an ice alarm.
Parameter 22 can be used to set a delay for ice alarm deactivation. It
will keep the ice alarm active after the heating and cooling phase for the
duration of the time delay. This is to prevent repetitive alarms during a
long icing event.
HEATING PHASE
Right after the ice alarm is detected, sensor starts to heat itself to get
rid of the accumulated ice. It is also possible to disable heating by
parameter 12. The whole heating process can be controlled with
parameters 12 –18, 23 and 24. Default heating parameters shoud be
useful enough for most weather conditions.
Automatic heating is used to remove soft ice which has slowly
accumulated over the sensor in light icing conditions. It does not
generate an ice alarm. Automatic heating is controlled with parameters
23 and 24.
COOLING PHASE
When sensor is heated to the maximum heating temperature, LID
moves to Cooling phase. Ice signal value is measured all the time and
it should be close to the maximum after the Heating phase.
Cooling phase has ended when sensor temperature is close to ambient
temperature (parameter 20), or maximum cooling time (parameter 19)
has exceeded, or sensor temperature has gone below 0 ºC.
Ice alarm is released after the cooling period if ice signal value is above
the alarm level.
FAULT MODE
LID indicates a fault or failure if there are problems in icemeasurement,
temperature measurements, heating or in other operations of the unit.
Fault indication is visible in the Fault LED in the front panel, serial and
web user interfaces and in the fault relay output.
Please note that the Fault relay is normally energized, providing thus a

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 10/37
fail-safe operation.
Depending on the fault, LID may continue operating otherwise normally
or indicates a critical failure. E.g. ice measurement error is a critical
failure but heating failure is not.
Explanation of the fault codes in the serial interface are presented in
Appendix A.
3.2 LID-3300IP Front Panel
Indicator / button
Meaning
POWER
Green light means power is on.
No light means no power.
ICE ALARM
Red light means ICE ALARM.
No light means NO ICE ALARM.
HEATING
Red light means HEATING is ON.
No light means HEATING is NOT ON.
FAULT
Red light means FAULT is ON.
No light means FAULT is NOT ON.
TEST BUTTON
Pushing the test button shortly will generate
an ICE ALARM.
Pushing the test button longer (about 10 sec-
onds) will reset the device.
3.3 Use of different parameter settings
Functionality of LID-3300IP Ice Detector system is configurable as
described in chapter 3.1. All parameters as well as their default and
valid values are described in Appendix B. “Parameters”.
In general, parameters can be grouped to following categories:
- Ice detection parameters (P0 - P6, P22)
- Heating parameters (P12 - P20, P23, P24)
- I/O parameters (P7 - P9)
Default parameter values are configured to every device before delivery
and they suite perfectly for most of the cases.
Since icing is very different in different locations globally or even locally
and in different times of the year, user may want to change parameter
values to better suite his application. If parameter values are changed,
Labkotec recommends to apply the following guidelines:
Use case
Recommended parameter values
Stop wind turbine due to safety risk
P0 = 30 - 70, P1 = P0 + 10
Start blade heating (anti-icing)
P0 = 70 - 90, P1 = P0 + 10
P16, P17, P18 close to maximum
Extreme icing conditions
P0 > 60, P1 = P0 + 10
P16, P17, P18 close to maximum
Please consult Labkotec when defining parameters for your application.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
Copyright © 2016 Labkotec Oy 11/37
4 SERIAL INTERFACES: RS-232 AND OPTICAL FIBER
LID-3300IP Ice Detector is equipped by default with an RS-232 serial
communication interface for configuration and connection to SCADA
systems.
When RS-232 interface is connected permanently to a SCADA system,
please use an external powered galvanic isolator.
Also, an optical fiber serial interface is available as an option. This
requires an additional RS2O Converter module to be installed inside
LID-3300IP Control Unit (item 14 in the lower picture in chapter 2.1).
Only either of the interfaces can be used at a time. Selection of the used
interface is done with the RS-232 / Optical fiber interface selection
jumper (item 8 in the lower picture in chapter 2.1) as follows:
1. Switch off the power from LID-3300IP control unit
2. Open the cover of LID-3300IP control unit
3. Set selection jumper between
pins 1 and 2 (left and middle) for RS-232
pins 2 and 3 (middle and right) for RS2O module
4. Connect cable(s) according to the above jumper selection:
RS-232 cable to RS-232 D-connector (item 9 in the
lower picture in chapter 2.1)
Optical fibers to RS20 Converter module through the
right side cable gland on LID-3300IP control unit
5. Close the cover of LID-3300IP
6. Connect RS-232 cable or optical fibre to system
7. Switch on the mains power
4.1 RS-232 Terminal Settings
Ice signal value, eventual alarms and fault diagnostics can be obtained
by using a PC equipped with an ordinary terminal program e.g. Tera
Term. It’s also possible to change operational parameters with the
terminal program. The following procedure describes serial port setting
using freeware ‘Tera Term’ - terminal program.
1. Connect the RS-232 port of your PC to the RS-output D-connector
on the LID-3300IP control unit. Use USB-to-RS converter if your PC
is not equipped with an RS-232 port.
2. Start the terminal program and select Setup >Serial Port. Select
the RS-232 (COM) port of your PC where the serial cable is
connected.

LID-3300IP Ice Detector D80186JE-3
Installation and Operating Instructions
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3. Make port settings as below and press OK.
4. Select Setup >Terminal and set Local echo and New-line
settings as described below. Press OK.
LID should start communicating with your PC as seen below.
Finally change the terminal font from menu: Setup > Font.
Choose e.g Courier New, regular, Size 9, to view as much text as
possible in one window at a time.
Now all the settings are ready for communication.
5. You can save the session for further use. Select Setup > Save
setup… TERATERM.

LID-3300IP Ice Detector D80186JE-3
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4.2 Serial Output - Streaming Mode Format
Right after the connection to RS-232 serial output has been
established, Ice Detector starts to send a data format through the
connection. New values are reported once every 4 seconds.
Example (variable length format with two temperature sensors):
08 -5.0 -5.5 *100
08 -5.5 -5.5 *100
08 -6.0 -6.0 *100
…
There are three different output formats:
- Variable length format (RSFORMAT 0)
- Constant length format (RSFORMAT 1)
- LID-3210 format (RSFORMAT 2)
The output format is read with command RSFORMAT and set with
command RSFORMAT <x>.
In case parameter 4 (Number of temperature sensors) has been set to
1, ambient temperature value is not visible in the RS output.
More detailed definitions of the output formats are presented in
Appendix A.
4.3 Serial Output –Measurement and Configuration Menu
RS-232 streaming mode can be interrupted at any time by pressing the
Enter key. The following menu structure opens with self-explaining
instructions.
Please note that menus may vary between different software versions
of LID-3300IP.
RS-232 output returns to streaming mode either by pressing ‘q’ or
automatically after 60 seconds.
ENTERING COMMANDS
All commands in the menus can be given in capital or small letters.
In addition to the commands listed in the menus, e.g. the following
commands are available. They can be entered in any menu view.
- TEST
The test command starts a manual ice alarm test.
- HEAT
The heat command starts manual heating.
See Appendix C for a complete list of terminal commands.

LID-3300IP Ice Detector D80186JE-3
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MAIN MENU
MENU 1. MEASUREMENTS AND STATUS
MENU 2. PARAMETERS
The complete list of parameters is presented in Appendix B.
Parameters.
To read a parameter, type: RP<param nbr>
Example: RP0
To change a parameter, type: SP<param nbr> <value> and press
Enter.
Example: SP0 50

LID-3300IP Ice Detector D80186JE-3
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MENU 3. DEFAULT PARAMETERS
The complete list of parameters is presented in Appendix B.
Parameters.
In case of problems, it might be useful to compare the actual parameter
values with the default parameter values.
Default parameter values can be restored with command SDF.
MENU 4. NETWORK SETUP
When LID-3300IP is connected to Internet or Intranet, the following
settings can be done via this menu: IP-address, Default gateway and
Subnet mask. LID-3300IP has a unique MAC address which is also
visible through this menu.
MENU 5. VERSION INFORMATION
Version information of LID-3300IP Control Unit and LID/ISD Sensor can
be seen from this menu.

LID-3300IP Ice Detector D80186JE-3
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MENU 6. SITE INFORMATION
Site name can be changed through this menu. Site information is visible
in every menu and in the Web user interface.

LID-3300IP Ice Detector D80186JE-3
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5 INTERNET WEB ACCESS
LID-3300IP is equipped with an in-built web server which provides an
easy-to-use web-based user interface for Ice Detector measurement
data, status and parameters over the Internet.
Depending on the configuration of the IT network, the web user
interface is available only locally in the local area network (LAN), more
widely through wide area network (WAN) or from everywhere e.g.
through VPN connections.
Please note that the IP address, Default gateway and Subnet mask
settings must be set through the RS-232 interface or through direct web
access between PC and LID-3300IP (see chapter 5.5) before the
Internet access is possible at all.
Once the network settings are set, open a web browser and type the IP
address of the ice detector to the address field of the browser.
Please note that the functionality of the web user interface varies
between different software versions of LID-3300IP.
LID-3300IP supports most of the available web browsers. However, the
look-and-feel may vary a little bit between different browsers.
Web user interface is divided into four sections:
1. Header
2. Status (upper left corner)
3. Raw command Input (lower left corner)
4. Settings (right side of the view)
Each section is explained in more details in the following chapters.

LID-3300IP Ice Detector D80186JE-3
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5.1 Web UI - Header
The header section of the web user interface starts with the text
Labkotec Ice Detector.
In the center of the header, there is space for the individual site name,
place or other identification of the Ice Detector. This text can be
modified in Site information Tab of the Settings section.
Information on the current user is shown in the upper right corner.
5.2 Web UI –Status
Status section is updated automatically every four seconds with the
latest measurement and status data, including
- Status of Ice Detection
oNo ice detected
oICE ALARM
oCRITICAL FAILURE
oNO ICE DETECTED (HEATING STARTED BY USER)
oICE ALARM (TEST)
oAUTOMATIC SENSOR HEATING
- Measurements:
oIce signal strength
oSensor temperature
oAmbient temperature
- Mode of operation
- Ice Alarm Test button (Test can also be cancelled)
- Manual Heating start button (Heating can also be cancelled)
- Status of I/O:
oAnalog output values
oRelay output values
- Present failures
5.3 Web UI - Raw command input
It is possible to give the same commands, with a couple of exceptions,
to LID-3300IP as through the menus of RS-232 serial interface.
5.4 Web UI - Settings
LID-3300IP parameters and settings can be viewed and changed
through this interface. Settings are divided into different tabs as follows:
Configuration parameters
All parameters are visible in one view. To change a parameter, click
Change, type the new value and press Save.
Information about each parameter is available by clicking the
parameter number.
Site information

LID-3300IP Ice Detector D80186JE-3
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In the Site information window it is possible to define the name and
additional information of the site where this Ice Detector locates.
Site name becomes visible in the header of web user interface and
in all menus of RS-232 interface.
Network setup
Network setup information is visible here. An administrator is able
to change the IP address, default gateway address and netmask
address.
Note that the connection is lost if the IP address is changed.
Version information
Version information of control unit and sensor is available here.
User setup
User setup can be modified by an administrator. Password inquiry
is not enabled by default. Log in as an administrator to enable it.
When password inquiry is enabled, there are three user levels:
oVisitor is only able to view the status and parameter
values.
oTester is able to activate Ice Alarm Test and Manual
Heating.
oUser (that has logged in) is able to change parameter
values, start an ice alarm test and start manual heating.
User cannot change network settings or change user
setup.
oAdministrator is able to change parameter values, start
an ice alarm test, start manual heating, change network
settings and change user setup.
The default administrator password is: a123.
If the administrator password is changed and forgotten, it is
possible to restore the default administrator password through RS-
232 interface (see Appendix C. Terminal commands).
Event log
Event log is a new functionality in sw version v1.40 or later.
Event log shows history of various events in chronological order.
Ice detector saves 500 last events of four different type of events:
oALARMS shows history of ice alarms
oFAULTS shows various fault events
oSETTINGS shows parameter changes made by users
oOTHER shows general events
Complete list of log messages is available in Appendix E. Event log
messages.
NOTE! System clock must be set to enable event logging. See
paragraph Clock below for more information.
Clock

LID-3300IP Ice Detector D80186JE-3
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Ice detector’s real time clock can be set here.
Only an administrator is able to change the settings of system clock.
Clock can be set either
omanually by selecting Change and setting time in format
<DD.MM.YYYY hh:mm>, where
DD is date
MM is months
YYYY is year and
hh and mm are hours and minutes, respectively.
oby using Sync with PC you can set time directly from your
PC-computer. NOTE! Your PC might be in different time
and time zone than the ice detector.
oby using SNTP protocol. More information below (*).
Manual Daylight Saving Time setting changes the time one hour
ahead or back at the moment when value is changed.
(*) More information about SNTP
System clock can also be synchronised with network time stations
using a built-in SNTP-client. SNTP uses UDP-protocol on port 123.
To activate SNTP-client, set first primary and alternative SNTP-
server domain names (or IP-addresses), your current time zone
related to UTC (Universal Time Coordinated) and finally set SNTP
Client ON/OFF –switch to ‘1’. SNTP-client makes then first time
synchronization attempt and updates system time then at intervals
of 15 hours.
The following SNTP domain names are used as default:
oPrimary SNTP-server time1.google.com
o1st alternative SNTP-server time.nist.gov
o2nd alternative SNTP-server time2.google.com
The primary SNTP-server is normally used. In case the primary
server is not responding then alternative server(s) will be used.
SNTP-client uses built-in domain name server system (DNS) to get
ip-address of selected SNTP-servers. DNS runs on UDP-port 53.
Normally it is not necessary to change these ip-addresses, but it’s
possible to change them using web UI- raw command window or
RS-232 interface (see Appendix C. Terminal commands).
Default ip-addresses and service providers used for DNS are:
oPrimary DNS-server 8.8.8.8 Google
o1st alternative DNS-server 156.154.70.1 DNS advantage
o2nd alternative DNS-server 4.2.2.1 Google
In case of power failure the clock has a reserve runtime of
approximately 10 days. When connecting the control unit to mains
power after a long service break etc, check that the system clock is
running if you are not using SNTP to synchronize the clock. If the
system clock is stopped, event logging is also disabled and an alert
text ‘CLOCK IS OUT OF TIME - LOGGING DISABLED!!’ will be
displayed above the clock display in web UI. You have to set the
clock to enable event logging again.