OCEM LIMS Instruction manual

Document UT-MT-0872-EN Page 1 of 31
Via della Solidariet , 2/1
40056 Valsamoggia Loc. Crespellano
BOLOGNA ITALY
Edition 27/09/2018 Supersedes edition 30/04/2018
Via della Solidariet 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
V. Rossi

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INDEX
INDEX ................................................................................................................................................. 2
INDEX OF FIGURES ............................................................................................................................. 3
INDEX OF TABLES ............................................................................................................................... 3
1 GENERAL ......................................................................................................................... 5
2 CLASSIFICATION OF SIGNS ............................................................................................... 5
2.1 Type ................................................................................................................................ 5
2.2 Legend Sizes ................................................................................................................... 5
3 MAIN FEATURES ............................................................................................................. 6
3.1 Signs Description ............................................................................................................ 6
3.1.1 Frame .................................................................................................................... 6
3.1.2 Supports ................................................................................................................ 7
3.1.3 Panels .................................................................................................................... 7
3.1.4 LEDs Luminous Source .......................................................................................... 8
3.1.5 Electrical circuit ..................................................................................................... 8
3.1.6 Protection earthing ............................................................................................... 9
3.1.7 Models ................................................................................................................ 10
3.1.8 Monitoring Option .............................................................................................. 11
3.2 Part Number Identification .......................................................................................... 12
3.3 Environmental data ...................................................................................................... 12
3.4 Electrical Data ............................................................................................................... 13
3.5 Luminance Data ............................................................................................................ 14
4 INSTALLATION .............................................................................................................. 15
5 MAINTENANCE ............................................................................................................. 18
5.1 Periodical Checks .......................................................................................................... 18
5.2 LEDs Luminous Source Replacement ........................................................................... 18
5.3 Electronic Card Replacement ....................................................................................... 22
5.4 Front Panel Replacement ............................................................................................. 24
5.5 Electronic Equipment Replacement ............................................................................. 27
5.6 Troubleshooting ........................................................................................................... 28
6 DRAWINGS ................................................................................................................... 29
6.1 Wiring diagram ............................................................................................................. 29
7 LIST OF RECOMMENDED SPARE PARTS .......................................................................... 30
8 ACCESSORIES ................................................................................................................ 31

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INDEX OF FIGURES
Figure 1: Exploded view .................................................................................................................... 6
Figure 2: Frame.................................................................................................................................. 6
Figure 3: Support ............................................................................................................................... 7
Figure 4: Panels ................................................................................................................................. 7
Figure 5: LEDs luminous source......................................................................................................... 8
Figure 6: Electronic board ................................................................................................................. 8
Figure 7: Overall dimensions ........................................................................................................... 10
Figure 8: Electromechanical relay ................................................................................................... 11
Figure 9: Flange Installation with Anchor Bolts .............................................................................. 15
Figure 10: Concrete foundation ...................................................................................................... 17
Figure 11: Wiring diagram (sign without circuit stabilizer) ............................................................. 29
Figure 12: Wiring diagram (sign with circuit stabilizer) .................................................................. 29
INDEX OF TA LES
Table 1: Types of signs....................................................................................................................... 5
Table 2: Legend Sizes ......................................................................................................................... 5
Table 3: Signs dimensions ............................................................................................................... 10
Table 4: Sign-strip length combination ........................................................................................... 11
Table 5: Environmental Data ........................................................................................................... 12
Table 6: Power consumption at maximum luminance ................................................................... 13
Table 7: Isolating Transformer Size [Watt] without Circuit Stabilizer............................................. 13
Table 8: Isolating Transformer Size [Watt] with Circuit Stabilizer .................................................. 14
Table 9: Typical Photometric Performance ..................................................................................... 14
Table 10: Foundation sizes .............................................................................................................. 17
EDITIONS
Ver. Date Description Authors Reviewers Approver
1.0 20/01/2017 FIRST ISSUE P. CORINTO E. RAULI M. MAZZOTTI
2.0 30/04/2018 GENERAL UPDATES P. CORINTO/V. ROSSI E. RAULI M. MAZZOTTI
3.0 27/09/2018 UPDATE SPARE PARTS M.BACCIGLIERI E. RAULI M.MAZZOTTI
LIST OF ATTACHMENT
Reference n° Document Code Description

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A REVIATIONS 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

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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

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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

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3.1.2 Supports
Each support includes a pole,
a BREAKABLE COUPLING KIT
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 : Panels

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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 Electrical circuit
Constant Current supply (AGL Series Circuit)
Signs for constant current series circuits are equipped with an
electronic current converter housed inside a water proof
aluminium box, mounted on a side of the external frame.
About the luminance levels, two versions are available:
-1 luminance level over the whole input current range 2.8
A ÷ 6.6 A;
-2 luminance levels depending on the input current
value: in the standard version the current threshold at
which the luminance level changes is 5.9 A (but
optionally this threshold is customizable).
An option in available to monitor the light sources status,
compliant with the fail open operation (see 3.1.8).
Further, to facilitate the feeding of the sign with different
topologies of CCR, an optional stabilization circuit is available,
composed by an inductor and a capacitor (see Figure 12Figure
12: Wiring diagram (sign with circuit stabilizer).
For the electrical connection to the isolating transformer the sign is equipped with a two-pole
cable lead with L-823 plug, style 1, protected by a corrugated pipe.
Figure 5: LEDs luminous source
Figure 6: Electronic board

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The sign is also equipped by an external disconnecting switch (main switch), which allows to light
off the sign and at the same time short circuit the isolating transformer. The main switch permits
to light off the sign without disconnecting it from the series circuit.
The main switch MUST BE OPERATED ONLY WITH THE CCR OFF.
In general the CCR must be turned off before any intervention on the sign.
See Figure 11 and Figure 12 for the two types of wiring diagram of the signs (without and with
stabilization circuit).
Low Voltage supply (230 V – 50/60 Hz) (OPTION)
An option is available that permits to feed the sign through a 230Vac supply network.
In this case the luminance level is constant and the monitoring of the sign status is not available.
3.1.6 Protection earthing
On the aluminium box containing the electronics, an earthing stud is available (see Figure 6).
FOR SAFETY PURPOSES, A CABLE OF 4 MM
2
MINIMUM SECTION, CONNECTED TO
THE EARTHING SYSTEM OF THE AGL CIRCUIT MUST E CONNECTED TO THE
EARTHING STUD OF THE SIGN.

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3.1.7 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
Supports
quantity
Distance
D [mm]
Supports
quantity
Distance
D [mm]
Supports
quantity
Distance
D [mm]
Supports
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 1054 3 527
2054 1950 3 767 3 767 3 767 4 511
2294 2190 4 591 4 591 4 591 4 591
2534 2430 4 671 4 671 4 671 6 403
2994 2890 4 825 4 825 4 825 6 495
Table 3: Signs dimensions

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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 : Sign-strip length combination
3.1.8 Monitoring Option
The electronic card 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 card.
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

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3.2 Part Number Identification
LIMS01 – 3 – 20 – 1 – 01
asic 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 (2 tethers for signs with number of supports ≥ 3)
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

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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 is 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
SINUS
OIDAL
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
1
5
0
150
*
150
150
30
SINUSOIDAL
300
1
5
0
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

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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/m
2
180 cd >50 cd/m
2
110
Average
luminance red >30 cd/m
2
40 cd >10 cd/m
2
16
Average
luminance white >300 cd/m
2
350 cd >100 cd/m
2
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

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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

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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) Connect the cable plug of the sign to the socket of the isolating transformer. The plug-socket
connection should be secured depending upon the installation method.
j) CONNECT THE EARTHING STUD OF THE SIGN TO THE EARTHING SYSTEM OF THE AGL CIRCUIT
THROUGH A CABLE OF AT LEAST 4 MM
2.
THE CONNECTION OF THE SIGN EARTHING STUD TO THE AGL EARTHING SYSTEM
IS MANDATORY FOR SAFETY PURPOSES.
k) After the signs have been installed, turn the circuit on to the lowest step and check to see that
all the signs are lighted.

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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

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5MAINTENANCE
ATTENTION!
The CCR MUST be TURNED OFF before any intervention on the
sign.
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) Loosen the screws (without removing them) of the
top “C” clamps of the supports. The number is
variable based on the poles number.
c) Remove four screws that connect the top cover
with the sides of the structure.

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d) Lift the top cover carefully of a few centimeters, disconnect the earth cable and remove the
top cover.
e) Remove the spiral and disconnect the connector of the damaged LEDs luminous source by
pressing on the tab indicated by the arrow.

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f) Cut the tie wrap.
g) Lift and rotate the LEDs support and pull the LEDs strip as shown in figure.
h) Insert the new strip LEDs in the support, link the wires with a tie wrap and reposition the
support on the panels.