OCEM LIMS Instruction manual

Document UT-MT-0872-EN Page 1 of 21
Via della Solidarietà 2/1 –40056 Valsamoggia - Italy
THIS COPY IS NOT SIGNED SINCE IT IS FILED AND DELIVERED BY MEANS OF THE AUTOMATIC KNOWLEDGE MANAGEMENT SYSTEM (IT CAN BE SIGNED ON REQUEST). THIS DOCUMENT AND THE DATA CONTAINED HERE IN, IS
PROPRIETARY PROPERTY AND SHALL NOT BE DUPLICATED, USED OR DISCLOSED –IN WHOLE OR IN PART –FOR ANY PURPOSE WITHOUT WRITTEN CONSENT OF OCEM.
LED LUMINOUS GUIDANCE SIGN
LIMS
INSTRUCTION MANUAL FOR USE, INSTALLATION
AND MAINTENANCE
Compiled by: P. Corinto
Approved by: M. Mazzotti
MULTI
ELECTRIC
group

Document UT-MT-0872-EN Page 2 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
INDEX
INDEX................................................................................................................................................. 2
INDEX OF FIGURES............................................................................................................................. 3
INDEX OF TABLES............................................................................................................................... 3
1GENERAL......................................................................................................................... 4
2CLASSIFICATION OF SIGNS...............................................................................................4
2.1 Type ................................................................................................................................ 4
2.2 Legend Sizes ................................................................................................................... 4
3MAIN FEATURES ............................................................................................................. 5
3.1 Signs Description ............................................................................................................ 5
3.1.1 Frame .................................................................................................................... 5
3.1.2 Supports ................................................................................................................ 6
3.1.3 Panels .................................................................................................................... 6
3.1.4 LEDs Luminous Source .......................................................................................... 7
3.1.5 Electronic Board.................................................................................................... 7
3.1.6 Models .................................................................................................................. 8
3.1.7 Monitoring Option ................................................................................................ 9
3.2 Part Number Identification .......................................................................................... 10
3.3 Environmental data...................................................................................................... 10
3.4 Electrical Data............................................................................................................... 11
3.5 Luminance Data............................................................................................................ 12
4INSTALLATION .............................................................................................................. 13
5MAINTENANCE ............................................................................................................. 16
5.1 Periodical Checks.......................................................................................................... 16
5.2 LEDs Luminous Source Replacement ........................................................................... 16
5.3 Electronic Equipment Replacement............................................................................. 18
5.4 Troubleshooting ........................................................................................................... 19
6DRAWINGS ................................................................................................................... 20
6.1 Wiring diagram............................................................................................................. 20
7LIST OF RECOMMENDED SPARE PARTS.......................................................................... 21
8ACCESSORIES ................................................................................................................ 21

Document UT-MT-0872-EN Page 3 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
INDEX OF FIGURES
Figure 1: Exploded view .................................................................................................................... 5
Figure 2: Frame.................................................................................................................................. 5
Figure 3: Support............................................................................................................................... 6
Figure 4: Panels ................................................................................................................................. 6
Figure 5: LEDs luminous source......................................................................................................... 7
Figure 6: Electronic board ................................................................................................................. 7
Figure 7: Overall dimensions............................................................................................................. 8
Figure 8: Electromechanical relay ..................................................................................................... 9
Figure 9: Flange Installation with Anchor Bolts .............................................................................. 13
Figure 10: Concrete foundation ...................................................................................................... 15
Figure 11: Wiring diagram............................................................................................................... 20
INDEX OF TABLES
Table 1: Types of signs....................................................................................................................... 4
Table 2: Legend Sizes......................................................................................................................... 4
Table 3: Signs dimensions ................................................................................................................. 8
Table 4: Sign-strip length combination ............................................................................................. 9
Table 5: Environmental Data........................................................................................................... 10
Table 6: Power consumption at maximum luminance ................................................................... 11
Table 7: Isolating Transformer Size [Watt] without Circuit Stabilizer............................................. 11
Table 8: Isolating Transformer Size [Watt] with Circuit Stabilizer .................................................. 12
Table 9: Typical Photometric Performance..................................................................................... 12
Table 10: Foundation sizes .............................................................................................................. 15
EDITIONS
Ver.
Date
Description
Authors
Reviewers
Approver
1.0
20/01/2017
FIRST ISSUE
P. CORINTO
E. RAULI
M. MAZZOTTI
LIST OF ATTACHMENT
Reference n°
Document Code
Description
ABBREVIATIONS AND TERMS
Term or abbreviation
Description
LED
Light Emitting Diode
ICAO
International Civil Aviation Organization
EASA
European Aviation Safety Agency
PMMA
Polymethylmethacrylate
CCR
Constant Current Regulator
FAA
Federal Aviation Administration

Document UT-MT-0872-EN Page 4 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
1GENERAL
The internally LEDs illuminated LIMS signs are designed to be used on airport taxiways and runways
to convey a mandatory instruction, information on a specific location or destination on a
movement area or to provide other information to meet the requirements of Surface Movement
Guidance.
LIMS are single face signs in compliance with ICAO - Annex 14 Vol.1, EASA CS-ADR-DSN Chapter N
and NATO-STANAG 3316. White on Red, Yellow on Black and Black on Yellow colour combination
may be ordered with any desired message.
The signs described in this manual are manufactured to be used on airport series circuits, through
isolating transformers, powered by 5-step (2.8 A - 6.6 A), 3-step (4.8 A - 6.6 A), and 1-step (6.6 A)
Constant Current Regulators.
Consult ICAO Specs - Annex 14 and ICAO Aerodrome Design Manual - Part 4 for sign features and
use.
2CLASSIFICATION OF SIGNS
2.1 Type
Mandatory signs
White legend on Red background
Location signs
Yellow legend on Black background
Information (direction, destination,
boundary) sign
Black legend on Yellow background
Table 1: Types of signs
A sign may consist of multiple arrays of the above messages.
2.2 Legend Sizes
Height of large legend
400 mm
Height of mid legend
300 mm
Table 2: Legend Sizes

Document UT-MT-0872-EN Page 5 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3MAIN FEATURES
3.1 Signs Description
The signs practically include the following sections (Figure 1):
A. Frame
B. Supports
C. Panels
D. LEDs luminous source
E. Electronic board
3.1.1 Frame
The frame principally consists of a bearing
bottom structure, two sides and one top
cover (Figure 2).
Bottom structure, sides and top cover are
made of extruded aluminium profiles,
realized according to our design.
The signs are equipped with a single top
cover, locked to the main structure by means
of four hexagonal knob. The main structure is
white outside painted (other colours are
available on request).
Figure 1: Exploded view
Figure 2: Frame

Document UT-MT-0872-EN Page 6 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3.1.2 Supports
Each support includes a pole,
a breakable coupling and a
floor flange (Figure 3). All
components are made of
aluminium. The supports are
fixed to the structure with
“C”clamps.
3.1.3 Panels
The panels enclosed in the frame are (Figure 4):
Text panel
Light-guide panel
Back panel
The text panel is made of high
performance methacrylate 4
mm thick.
The light-guide panel is made of
PMMA, while the back panel is
made of a composite material.
The legend is obtained by
means of adhesive coloured
translucent films applied to the
internal side of the text panel.
Figure 3: Support
Figure 4: Panels

Document UT-MT-0872-EN Page 7 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3.1.4 LEDs Luminous Source
The signs are illuminated by strips LEDs
(Figure 5) inserted in suitable supports.
High efficiency white LEDs are used, with
an average life of 60.000 hours.
The positioning of the LEDs has been
determined through photometric tests in
order to meet the luminance values as
required by ICAO Specs - Annex 14.
Three different strips lengths are used
(720, 960 and 1200 mm) for the different
signs lengths (see Table 4).
3.1.5 Electronic Board
Signs for series circuits are equipped with a current
converter completely assembled on an encapsulated
electronic board.
By varying the current of the CCR in the range 2.8 -
6.6A, the power supply board provides:
a constant current to each luminous source,
allowing a constant luminance regardless the
step of the CCR (LIMS with single luminance
level)
one out of two possible constant current
levels, allowing to change the brightness of
the sign based on the step of the CCR (LIMS
with two luminance levels)
For the electrical connection to the isolating
transformer the sign is equipped with a two-pole
cable lead with L-823 plug, style 1.
An external power disconnecting ON-OFF switch is provided to break all electrical
connections to the sign, in case some signs must be selectively powered off.
Note that the power supply from the CCR must be turned off before any
intervention on the device.
See from Figure 11 for the wiring diagram.
Figure 5: LEDs luminous source
Figure 6: Electronic board

Document UT-MT-0872-EN Page 8 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3.1.6 Models
The main sign dimensions are depicted in Figure 7. The possible values for the lengths A, A’, B, C,
D and H are indicated in Table 3.
Figure 7: Overall dimensions
Length A
[mm]
Visible
length
A’ [mm]
H=300mm B=704mm C=900mm
H=400mm B=904mm C=1100mm
Wind @ 320 km/h
Wind @ 480 km/h
Wind @ 320 km/h
Wind @ 480 km/h
Quantity
Distance
D [mm]
Quantity
Distance
D [mm]
Quantity
Distance
D [mm]
Quantity
Distance
D [mm]
1094
990
2
574
2
574
2
574
2
574
1354
1250
2
834
2
834
2
834
3
417
1574
1470
2
1054
2
1054
2
1040
3
527
2054
1950
3
767
3
767
3
767
4
511
2294
2190
3
887
3
887
3
887
4
591
2534
2430
4
671
4
671
4
671
5
503,5
2994
2890
4
825
4
825
4
825
5
618,5
3744
3640
5
806
5
806
5
806
7
537
3984
3880
5
866
6
693
5
866
7
577
Table 3: Signs dimensions

Document UT-MT-0872-EN Page 9 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
Three different LED strips are possibly mounted on the signs, according to the overall sign lengths.
The correspondence between sign length and LED strip length are showed in Table 4:
Sign length A
[mm]
Strip LEDs
Quantity
Length [mm]
1094
1
960
1354
1
1200
1574
2
720
2054
2
960
2294
3
720
2534
2
1200
2994
3
960
Table 4: Sign-strip length combination
3.1.7 Monitoring Option
The electronic board of the signs with Monitoring Option has an electromechanical relay with a
normally closed contact. This contact is assembled in series with the feeding circuit of the
electronic board.
When one or more LED strips fail, the normally closed contact opens, turning off the electronic
board and the sign lights off.
A manual intervention is needed to restore the relay contact in closed position and then to permit
the sign to switch on again.
Note: If the relay contact is restored after a LED strip failure and no
replacement is performed, the monitoring functionality is
automatically disabled. The monitoring will not be reactivated by the
system until the failed LED strips will be replaced with good strips.
The Figure 8 shows the positions of the relay contact.
Figure 8: Electromechanical relay

Document UT-MT-0872-EN Page 10 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3.2 Part Number Identification
LIMS01 –3 –20 –1 –01
Basic Part Number:
Version:
Message Size:
3 = Sign, 300 mm Legend Height
4 = Sign, 400 mm Legend Height
Type (visible length mm):
10 = 990
20 = 1950
30 = 2890
13 = 1250
22 = 2190
15 = 1470
24 = 2430
Luminance Level:
1 = Constant Luminance
2 = Two Luminance Levels
Options:
01 = Tether
02 = Yellow frame
03 = Black frame
04 = Circuit Stabilizer
10 = Monitoring
48 = Reinforced version FAA-mode 3 (483 km/h)
69 = Orange rear side for single face signs (Italy)
70 = Bird Spikes
3.3 Environmental data
Temperature
-40°C to +55°C
Weather
All outdoor conditions, exposure to: driving rains, snow and icing, salt-
laden atmospheres, relative humidity from 5 % to 95 %.
Wind Speed
322 Km/h (standard version) or 483 km/h (reinforced version –OPTION
48) ICAO Aerodrome Design Manual Part 6 Frangibility
Table 5: Environmental Data

Document UT-MT-0872-EN Page 11 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
3.4 Electrical Data
The luminous signs are powered by series circuits through isolating transformers compliant to FAA
Specs FAA L830-L831. The power consumption of the LIMS signs are reported in Table 6: for all
sign type the power factor is higher than 0.9.
Type
Power
Consumption
[W]
10
32
13
36
15
40
20
51
22
53
24
61
30
70
Table 6: Power consumption at maximum luminance
The minimum size of the isolating transformer depends on both the sign type and the selected
power supply (i.e. the number of current steps provided by the CCR), according to Table 7 and
Table 8.
Type
CCR TYPE
CCR 5 STEP
(2.8 A-6.6 A)
CCR 3 STEP
(4.8 A-6.6)
CCR 1 STEP
(6.6 A)
Constant
Luminance
Two
Luminance
Levels
Constant
Luminance
Two
Luminance
Levels
Constant
Luminance
10
SINUSOIDAL
150
65*
65*
65*
65*
PHASE CUT
150
100
100
65*
65*
13
SINUSOIDAL
150
100
100
65*
65*
PHASE CUT
150*
100
100*
100
100
15
SINUSOIDAL
150
100
100
100
65*
PHASE CUT
200
100*
100*
100
100
20
SINUSOIDAL
200
100
100*
100
100
PHASE CUT
200*
100*
150
100*
100*
22
SINUSOIDAL
200
100
150
100
100
PHASE CUT
200*
100*
150
100*
100*
24
SINUSOIDAL
200*
100*
150
100*
100*
PHASE CUT
300
150
150*
150
150
30
SINUSOIDAL
300
150
150
150
150
PHASE CUT
300
150
200
150
150
(*) we suggest to select a larger transformer size in case individual monitoring is performed with MCC devices
Table 7: Isolating Transformer Size [Watt] without Circuit Stabilizer

Document UT-MT-0872-EN Page 12 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
Type
CCR Type
CCR 5 STEP
(2.8 A-6.6 A)
CCR 3 STEP
(4.8 A-6.6)
CCR 1 STEP
(6.6 A)
Constant
Luminance
Two
Luminance
Levels
Constant
Luminance
Two
Luminance
Levels
Constant
Luminance
10
SINUSOIDAL
150
100*
100*
100*
100*
PHASE CUT
150*
150
150
150
150
13
SINUSOIDAL
150
150
150
150
150
PHASE CUT
200
150
150
150
150
15
SINUSOIDAL
150*
150
150
150
150
PHASE CUT
200
150
150
150
150
20
SINUSOIDAL
200
150
150
150
150
PHASE CUT
300
150*
150*
150*
150*
22
SINUSOIDAL
300
200
200
200
200
PHASE CUT
300
300
300
300
300
24
SINUSOIDAL
300
200
200
200
200
PHASE CUT
300
300
300
300
300
30
SINUSOIDAL
300
200*
200*
200*
200*
PHASE CUT
300
300
300
300
300
(*) we suggest to select a larger transformer size in case individual monitoring is performed with MCC devices
Table 8: Isolating Transformer Size [Watt] with Circuit Stabilizer
3.5 Luminance Data
Two versions of LIMS signs are available, according to the luminance option selected. For the
constant luminance sign, the luminance is practically constant for any value of the series circuit
current from 2.8A to 6.6A and the relevant values are shown in Table 9. In case of two luminance
levels, the high intensity level is selected with a current greater than 6A, while with any values
between 2.8A and 6A the low intensity luminance is provided. The high and low luminance levels
are reported in Table 9.
High Intensity Level
(and Constant Luminance)
Low Intensity Level
ICAO
Requirements
Typical
Value
ICAO
Requirements
Typical
Value
Average
luminance yellow
>150 cd/m2
180 cd
>50 cd/m2
110
Average
luminance red
>30 cd/m2
40 cd
>10 cd/m2
16
Average
luminance white
>300 cd/m2
350 cd
>100 cd/m2
135
Maximum ratio
between two
adjacent points
<1.5
1.3
<1.5
1.3
Maximum ratio
across sign
<5.0
1.8
<5.0
1.8
Table 9: Typical Photometric Performance

Document UT-MT-0872-EN Page 13 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
NOTE: the electrical and luminous data are referred to constant current regulators and
isolating transformers manufactured and/or distributed by OCEM. The data may change
with constant current regulators and/or transformers manufactured by other Companies.
4INSTALLATION
a) Take as reference Figure 7 for spacing between breakable couplings.
b) Remove the sign from the relevant packing.
c) The signs are normally installed so that the cable entry is located toward the runway or taxiway
edge.
d) The concrete foundation for the sign should be flat and levelled. Refer to Figure 9 for relevant
data. The isolating transformer must be placed inside a concrete pit complete with pipe elbow
for the secondary cable passage or inside a steel base complete.
e) It is recommended that the anchor bolts (M12X60) used for the flange anchoring, are mounted
after the completion of the concrete foundation. The anchor bolts have to be walled accurately
as shown in Figure 9 and in manner to assure the parallelism of the centreline marked on the
flange and the sign centreline.
Figure 9: Flange Installation with Anchor Bolts
f) Remove the frangible couplings/floor flanges from the bottom of the sign by loosening the
locking screws (set screw M8x14).
g) Taking care of the levelling of the floor flanges is very important to ease the installation of the
sign. Place a long carpenter level across the top of the breakable couplings to verify their

Document UT-MT-0872-EN Page 14 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
alignment and levelling. Do not tighten the flanges anchor nuts, tight (only finger-tight) until
the sign installation is complete.
Lower the sign with the legs onto the frangible couplings and tight the locking screws. Check
the sign to be sure that it is levelled. Shim the floor flanges as required and put drying grout
under the flange if necessary.
NOTE: some vertical adjustment can be obtained by rotating the frangible couplings a turn or two
in the floor flanges.
h) Once the sign has been levelled, tighten the anchor nuts securely. (NOTE: anchor hardware is
not supplied with the sign). Anchor hardware should be corrosion resistant.
i) Pass the cable lead with plug through the coupling for flexible pipe and connect the cable lead
with plug of the sign to the socket of the isolating transformer (be sure that the cable lead with
plug be passed through the coupling for flexible pipe). The plug-socket connection should be
secured inside the pipe elbow by using the suitable pair of plastic rings or inside the baseplate
by using the relevant supporting ring. Screw the coupling to the pipe elbow or to the baseplate,
fit the flexible pipe inside it and provide sealing between pipe and coupling.
j) After the signs have been installed, turn the circuit on to the lowest step and check to see that
all the signs are lighted.

Document UT-MT-0872-EN Page 15 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
Figure 10: Concrete foundation
Type
T [mm]
10
3469
13
3729
15
3949
20
4429
22
4669
24
4909
30
5369
Table 10: Foundation sizes

Document UT-MT-0872-EN Page 16 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
5MAINTENANCE
ATTENTION!
Never operate on electrical and electronic equipment while the CCR
is ON.
5.1 Periodical Checks
Daily
Check for burned-out led
Monthly
Check for dirty panels
Semi-Annual
Check for loose wire connections
Check for cracked or deteriorated wires
5.2 LEDs Luminous Source Replacement
a) Be sure that the series circuit is de-activated (CCR OFF); in any case turn the main switch to
OFF position
b) remove the four screws that connect the
top cover with the sides of the structure
c) remove the four top “C”clamps of the
supports

Document UT-MT-0872-EN Page 17 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
d) lift the top cover carefully of a few
centimeters and disconnect the earth
cable
e) remove the top cover
f) cut the tie-wraps and disconnect the
connector of the damaged LEDs luminous
source

Document UT-MT-0872-EN Page 18 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
g) lift the LEDs support and pull the LEDs strip
as shown in figure
h) Restore the initial condition and turn the main switch to ON position, turn On the CCR and
check the correct operation of the sign.
NOTE: if the sign has the Monitoring Option, prior to turn the CCR on, you have to restore in
GOOD position the contact of the monitoring relay on the electronic board (see par. 3.1.7)
5.3 Electronic Equipment Replacement
If troubles to the electrical/electronic are suspected proceed as follows:
a) Be sure that the series circuit is de-activated (CCR OFF)
b) Turn the main switch of the sign in OFF position
c) Remove the top cover of the electronic box by loosening the relevant four screws
d) Check the wiring, the connection to the terminal strips and the continuity
e) If necessary replace the electronic board and then check again the wire connections.
The electronic board has to be replaced for sure if the GDT1 gas discharger is tripped. This could
be checked by disconnecting the J1 plug and measure the ohmic resistance between the two
pins of the J1 PCB connector: the GDT1 discharger is tripped if the measured resistance is zero
or near zero (see Figure 11).
f) Mount the top cover with reverse procedure
g) Turn the main switch of the sign to ON position
h) Turn the CCR on and check the correct operation of the sign.

Document UT-MT-0872-EN Page 19 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
5.4 Troubleshooting
Problem
Problem cause
Solution
The sign is totally or
partially not lighted
Defective LED(s) on luminous
source(s)
Replace the LED(s) luminous
source(s)
Defective isolating transformer
Replace isolating transformer
Defective power supply board
Replace power supply board
The main switch is left to OFF
position
Turn the switch to ON position
Bad connection
Check wiring

Document UT-MT-0872-EN Page 20 of 21
Edition 20/01/2017 LIMS INSTRUCTION MANUAL
6DRAWINGS
6.1 Wiring diagram
Figure 11: Wiring diagram