Cedes cegard/Max-NT User manual

CEDES
© CEDES Part No. 106 258 201125
Installation and Operation Manual
(North America Version)
Light Curtain for
Elevator Door Protection
cegard/Max-NT

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2www.cedes.com © CEDES
IMPORTANT NOTES
FOLLOW THE INSTRUCTIONS GIVEN IN THIS MANUAL CAREFULLY. FAILURE TO DO SO MAY
CAUSE CUSTOMER COMPLAINTS OR SERIOUS CALL BACKS. KEEP INSTRUCTION MANUAL ON
SITE.
IT IS THE RESPONSIBILITY OF THE SPECIFIER, PURCHASER AND INSTALLER TO ENSURE THAT
ON COMPLETION, THE INSTALLATION COMPLIES WITH ALL RELEVANT FEDERAL, STATE AND
LOCAL CODES AND REGULATIONS THAT APPLY TO YOUR APPLICATION.
FOR ELEVATOR APPLICATIONS, PARTICULAR ATTENTION SHOULD BE GIVEN TO CLAUSE 2.13.5
REOPENING DEVICES FOR POWER-OPERATED CAR DOORS OR GATES OUTLINED IN ANSI-ASME
A17.1-2016 / CSA B44-16 SAFETY CODE FOR ELEVATORS AND ESCALATORS OR AN EARLIER
VERSION OF THIS STANDARD REQUIRED BY THE AUTHORITY HAVING JURISDICTION (AHJ).
THIS PRODUCT CANNOT FULFILL ANSI-ASME A17.1-2019 / CSA B44-19 SAFETY CODE FOR
ELEVATORS AND ESCALATORS OR LATER VERSIONS DUE TO NEW REQUIREMENTS FOR SELF-
MONITORING AND INTEGRATION OF APPROACHING OBJECT DETECTION. CONTACT YOUR
LOCAL CEDES REPRESENTATIVE IF YOU NEED ASSISTANCE WITH PRODUCT SELECTION TO
FULFILL THE REQUIREMENTS IN THIS VERSION OF THE CODE.
THESE LIGHT CURTAIN SYSTEMS MUST BE INSTALLED ONLY BY AUTHORIZED AND FULLY
TRAINED PERSONNEL. FOLLOW ALL NECESSARY SAFETY PRECAUTIONS DURING THE
INSTALLATION PROCESS, INCLUDING TAKING THE ELEVATOR AND DOOR OUT OF SERVICE
DURING INSTALLATION.
PLEASE TAKE NOTE THAT OBJECTS THINNER THAN THE BEAM SPACING MAY NOT BE
DETECTED.
DO NOT USE THIS PRODUCT FOR THE PROTECTION OF DANGEROUS MACHINERY OR IN
EXPLOSIVE ATMOSPHERES OR RADIOACTIVE ENVIRONMENTS. USE ONLY SPECIFIC AND
APPROVED TYPES OF SAFETY DEVICES FOR SUCH APPLICATIONS. OTHERWISE SERIOUS
INJURY OR DEATH MAY OCCUR.
WHEN SUPPLY VOLTAGES GREATER THAN 42 VOLTS ARE USED, THE INTERFACE WIRING TO
THE POWER SUPPLY AND TO THE DOOR DRIVE MUST BE MADE THROUGH A GREENFIELD
FITTING.

Installation and Operation Manual cegard/Max-NT
© CEDES www.cedes.com 3
Table of Contents
1.
!
Operation ................................................... 3
!
2.
!
Failsafe Operation ..................................... 3
!
3.
!
Power Supply.............................................. 4
!
4.
!
Installation ................................................. 4
!
4.1.!Mounting transmitter and receiver ................ 5!
4.2.!Cable guidance .......................................... 6!
4.3.!Installation of the control unit....................... 6!
4.4.!Electrical Installation.................................... 7!
4.4.1.!Power supply ........................................ 8!
4.4.2.!Transmitter and Receiver Connections.... 8!
4.4.3.!Fire recall............................................. 8!
4.4.4.!Output relay......................................... 8!
4.4.5.!Nudging and Nudging-AUX relay.......... 9!
4.4.6.!Nudging function.................................. 9!
4.5.!Power-up and test ..................................... 10!
4.6.!Snap on the vison shield............................ 10!
4.7.!Maintenance............................................. 11!
4.8.!Disposal ................................................... 11!
5.
!
Troubleshooting ....................................... 12
!
6.
!
Technical Data.......................................... 13
!
6.1.!Specifications ............................................ 13!
6.2.!Dimensions............................................... 14!
6.2.1.!Transmitter / Receiver ......................... 14!
6.2.2.!Control unit with housing .................... 15!
6.3.!Bill of material and part numbers............... 15!
1. Operation
The cegard/Max-NT is ideal for improved comfort and
safety in elevator door protection applications where
nudging and fire recall functions are required in the light
curtain controller. Complete modernization kits, a vast
range of accessories and special configurations are
available.
The cegard/Max-NT infrared light curtain kits generally
include a control unit the following components:
(A) Transmitter edge with white connector
(B) Receiver Edge with blue connector
(C) Transmitter cable with white connectors
(D) Receiver cable with blue connectors
(E) Control unit.
Kits may also include the following components:
• Mounting profiles (MP),
• Spacer profiles (SP),
• Vision shields (VS)
• Ccable guide wires (CGW)
• Protective tubing (PT), and
• Additional hardware (e.g. screws, ties, etc.)
• Other accessory items
The transmitter and receiver should be mounted so that
the LEDs are facing opposite each other such that the
protective field that is formed between the transmitter
and receiver units provides the desired coverage (e.g.
the elevator cab entrance).
The cegard/Max-NT control unit is mounted within reach
of the ends of the transmitter and receiver cables (e.g.
on the car top or in a nearby operating panel). The con-
trol unit acts as an interface between the light curtain
system and the door control system.
To increase the lifetime of the electronic components,
especially the infrared transmitter elements, the control
unit continuously controls the light emitting power based
on the distance between the transmitter and the re-
ceiver. When the doors are closed, the emitting power
is nearly zero. This function also prevents optical by-
passing at the car door sill.
The mounting components included in the ce-
gard/Max-NT light curtain kit support both side opening
door and center opening elevator applications. The
components are suitable for new installations and the
modernization of existing elevators.
2. Failsafe Operation
Important
During normal operation, the cegard/Max-NT light cur-
tain system provides comfort for passengers by signal-
ing the elevator control system to reopen the elevator
cab doors. That said, infrared door protection systems,
including the cegard/Max-NT light curtain system, can-
not provide absolute safety for elevator passengers
passing through the elevator cab entryway as they are
only a component of the overall elevator door protection
system.
Light curtains are not allowed to be the final failsafe de-
vice of the door mechanism. A failsafe force and kinetic
energy limiter must provide the ultimate safety function.
Due to the nature of door system designs, there are ex-
tremely rare occurrences when the elevator doors can
close even when an object or person is present. There-
fore, federal, state and local codes require other safety
means to prevent passengers from being hurt by the el-
evator doors during closure. These dangerous situa-
tions should be detected by the elevator control, which
should take the elevator out of service. Final safety re-
sponsibility remains with the elevator integrator and/or
contractor.

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3. Power Supply
The cegard/Max-NT control unit contains state-of-the-
art-technology that supports a wide-range of supply volt-
ages without any adjustment or special wiring.
Voltages from 17 … 265 Volts AC or DC can be used
and the cegard/Max-NT light curtain system. When DC
voltage is used the polarity of terminals P and N is irrel-
evant. This feature is very useful, especially for modern-
ization, where the supply voltage on the car top may not
be precisely known.
The incoming power must be fused with a maximum
fuse rating of 10 A.
4. Installation
The following sequence should be followed for installa-
tion:
1. Open the shipping box and verify that all components
are all present according to the bill of material (See
Chapter 7)
2. Use proper barricading and displays to prevent pub-
lic entry into the work area
3. Ensure that the elevator is taken out of service to pre-
vent movement during installation (e.g. lockout / ta-
gout procedure).
4. Install the transmitter / receiver with the mounting or
spacer profile to the door wings or to the slam post
(additional description provided later in this section).
5. Guide the cables of the transmitter and receiver to
the control unit using the cable binders provided. In-
stall the cable guide to minimize cable swing during
operation.
6. Install the control unit on the car top or in the control
cabinet.
7. Connect power to the controller.
8. Power-up the controller and perform testing.
9. Snap on the vision shields to cover the transmitter
and receiver units and install the cover to the control
unit.
Figure 1: Mounting overview
13 ... 75 (1/2" ... 3")
6 (1/4")
Light curtain
Spacer / mounting profile
Control unit
#10x1/2" self-drilling /
self-tapping
Cable guide
#10x1/2" self-drilling /
self-tapping
Vision shield
Important
The recommended distance between
the door sill and the bottom of the sen-
sors (mounting profile and spacer pro-
file respectively) is ¼". A greater dis-
tance reduces safety due to an unpro-
tected area right above the sill!

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Spacer profile
4.1. Mounting transmitter and receiver
Important
It is important that the active parts of the transmitter and
receiver units are mounted so that they face each other.
The active sensor part is the side with the round black
lenses. When used, the top end of the mounting profile
should be fixed with a self tapping screw. Transmitter
and receiver should be securely fastened and not be
bent or exposed to tension.
We recommend installation of the sensors as far away
as possible from the leading door edges to prevent them
from being damaged, e.g. by vandalism.
Figures 2 and 3 provide mounting examples for mount-
ing the transmitter and receiver edges in different appli-
cations. The edges may be directly mounted to the sur-
faces, or utilize mounting profiles, spacer profiles and
vision shields as shown in the diagrams.
Figure 2: Mounting details in center opening doors with spacer
Figure 3: Mounting details of side opening doors with spacer
Important Notes
Do not bend the long components! The transmitter and
receiver units are optoelectronic devices that can be
damaged when they are bent. The long components in
the kit may also be damaged (e.g. mounting profiles) if
excessive bending occurs.
It is important that the alignment angle of the transmitter
to the receiver is less than ± 10° when the door is fully
closed. We recommend that you keep the optical angle
close to zero (see Figures 2 and 3).
When light curtains are used for modernization, the
alignment angle between the transmitter and receiver
may be more than ± 10°. In this case a spacer profile
can be used to shift the sensor unit by 0.63" toward the
same axis as the sensor unit. See ordering information
for these components.
When using vision shields, you need to provide a mini-
mal gap between the mounting profile of the light curtain
and a perpendicular mounting surface immediately to
the left or right of the mounting profile. Otherwise, you
will be unable to snap on the vision shield over the light
curtain (see Figure 3).
The cegard/Max-NT light curtain is designed to have
high immunity to ambient light conditions (100 kLux).
Avoid exposing the receiver unit to sources of light that
exceed this value (e.g. strobe lights, other optical sen-
sors and direct sunlight) as it may be “blinded” by the
light source. For these applications, orient the receiver
such that it is not exposed to the light source or by in-
stalling it in a U-channel that prevents the light source
from being seen directly by the receiver.
Vision shield
Light curtain
Spacer profile
Optical axis
1.1"
(28)
0.5-3.0"
(14-75)
0.95" (24)
1.4" (35)
Spacer profile
#10 x ½" self drilling
1.4" (35)
0.925" (23.5)
Mounting profile
min. 0.1 -
0.2" gap
<10°
<10°
±10°

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4.2. Cable guidance
The cegard/Max cables are color coded. The transmit-
ter cable features white connectors and the receiver ca-
ble features blue connectors. The round cable end con-
nects to the corresponding color-coded transmitter or re-
ceiver edge and the RJ-45 end plugs directly into the
corresponding color-coded plug on the control board.
Important
Pay close attention to proper cable installation to ensure
the highest possible reliability and lifespan of the light
curtain. A properly installed cable will withstand more
than 20 million door movements in applications where
the light curtain is mounted on a moving door, while a
poorly installed cable may break after less than 100,000
door movements.
Do not expose the cables to oil or
other greasy liquids.
Ensure that the cable bending radius
is greater than 3.2 inches (80 mm)
when cables are mounted.
As shown in Figure 4, guide the cables of the transmitter
and receiver to the control unit. A small bending radius
reduces the cable lifetime dramatically. Use the cable
binder A to fix the cable in place. Do not use plastic ca-
ble ties to secure the cable directly as this reduces the
lifetime of the cable. Install the cable guide wire B to
minimize potential cable swing.
Figure 4: Cable protection tube
The standard cable length of is 16 ft (5 m). An extension
cable of 10 ft (3 m) is available to extend the total length
to a maximum of 26 ft (8 m). Extension cables are often
used for tall elevator cars with door heights up to 10 ft (3
m).
4.3. Installation of the control unit
The cegard/Max-NT control unit (see Figure 5) can be
mounted horizontally or vertically using #10 x ½" self
drilling / self tapping screws. An ideal mounting location
is shown in Figure 1.
Figure 5: cegard/Max NT Control unit
Important
Printed Circuit Boards (PCBs) are sensitive to electro-
static discharge and must therefore be handled with
care to prevent damage. Be sure to implement antistatic
procedures when handling control boards.
B
A
B

Installation and Operation Manual cegard/Max-NT
© CEDES www.cedes.com 7
4.4. Electrical Installation
When the supply voltage or the voltage at the relay terminal is below 42 volts, use the standard cable entrance gaskets
to connect the transmitter, the receiver, the output relay and power.
Connect all wiring with more than 42 V through a Greenfield Fitting.
Disconnect power before opening the control unit to prevent electrical shock.
Do not remove inside cover or fuse cap.
Figure 6: Final installation with Greenfield Fittings (e.g. from Thomas & Betts or other UL / CSA approved manufacturer)
Figure 7: Wiring diagram

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Important
Before connecting electrical power, please ensure that
the power is switch to an off state in accordance with
local regulations (i.e. lockout / tagout). You must ensure
that system cannot inadvertently start up while you are
connecting the devices.
4.4.1. Power supply
Connect power to terminals as shown in Figure 7.
N : AC neutral; plus or minus for DC
P : AC Hot; plus or minus for DC
: Protective ground
The incoming power must be fused ≤ 10 A current.
The label on the cegard/Max-NT controller provides ter-
minal information for the electrical connections as well
as LED status information and DIP switch and potenti-
ometer settings.
4.4.2. Transmitter and Receiver Connections
The white transmitter connector must be plugged into
the white marked plug. The blue receiver connector
must be plugged into the blue marked plug.
4.4.3. Fire recall
Phase I: AC Hot, plus or minus for DC
Common I: AC neutral, plus or minus for DC
Phase II: AC Hot, plus or minus for DC
Common II: AC neutral, plus or minus for DC
Fire Recall Phase I
If the input labeled "Fire Recall Phase I" is activated, the
light curtain is disabled, and nudging is enabled. The
nudging buzzer sounds and remains on during door
close and until the car arrives at the designated landing.
The buzzer remains on for 15 seconds after the "Fire
Recall Phase I" input is deactivated.
Fire Recall Phase II
If the input labeled "Fire Recall Phase II" is activated,
the light curtain output is disabled. The nudging function
works independent of "Fire Recall Phase II". Operation
of the doors is taken over by people (i.e. firemen) elimi-
nating the need for automatic reopening and to guard
against false opening caused by smoke.
Important
This cegard/Max-NT light curtain is not a safety rated
device. A broken wire at the "Fire Recall Phase I” or “Fire
Recall Phase II" terminal or the use of faulty electrical or
electronic equipment may prevent the elevator from en-
tering into the corresponding Fire Recall state. In this
case, the corresponding “Fire Recall” input signal will
not be recognized and doors will not close as required
by code. The elevator integrator / contractor is respon-
sible for ensuring that this condition cannot be allowed
to occur.
4.4.4. Output relay
The light curtain Normally Open contact of the output re-
lay is energized when the detection beams are clear of
any obstruction and the transmitter and receiver are
aligned. The Normally Open contact of the output relay
is deenergized during a beam obstruction, a fault condi-
tion or with no power applied.
Important
The contact rating of the output relay is maximum 250
VAC / 8 A, 125 VDC / 0.5 A, 30 VDC / 8 A, and minimum
5 VDC / 10 mA. Make sure that you use a pilot relay
when switching higher voltage DC loads greater than
0.5 A.
Figure 8: Relay state when protective field is clear
Figure 9: Relay state when protective field is obstructed

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© CEDES www.cedes.com 9
4.4.5. Nudging and Nudging-AUX relay
The nudging and nudging-AUX relays are energized
when there is an obstruction longer than the Nudging
time specified by the nudging potentiometer. These re-
lays are deenergized in normal operation or with no
power applied.
The nudging time can be set from 1 s up to 60 s. The
factory setting is 20 s. The volume of the nudging buzzer
can be set to a recommended level from normal to loud.
4.4.6. Nudging function
The interruption time of the light curtain is monitored.
When this time exceeds the defined nudging time, the
nudging relay will be energized and a warbling buzzer
will sound. The nudging time can be adjusted by the cor-
responding nudging time potentiometer. Factory setting
is 20 seconds. The volume of the nudging buzzer can
be adjusted with a potentiometer. Factory setting is
maximum volume.
American / Canadian Nudging:
In some elevator controllers, it is desirable to drop the
"Light Curtain" contact after nudging triggers. In other
cases, it is not necessary. This issue was discovered in
Canada and therefore the switch is dubbed the Ameri-
can / Canadian nudging option.
• American Version – Light curtain relay drops for the
duration of the obstruction
• Canadian Version – Light curtain relay re-picks
when nudging starts
Important
The nudging relay and nudging-AUX relay contact rating
is 250 VAC / 8 A, 125 VDC / 0.5 A, 30 VDC / 8 A, min. 5
VDC / 10 mA. Use a pilot relay if switching 125 VDC
loads that exceed 0.5 A.
1) Nudging time is adjusted using the Nudging Time potentiometer. Factory default is 20 seconds.
2) The nudging output is held for 5 seconds after the obstruction is removed to let the door close.
Figure 10. Nudging timing diagram
Specifications of the Nudging function:
Designator
Min.
Max.
Comments
Nudging time
1 sec.
60 sec.
Logarithmic adjustment by potentiometer. Factory setting to 20s.
Nudging Hold Time
4 sec.
6 sec.
Fixed, Time nudging remains active after light curtain becomes clear
Nudging Status Indicator
-
-
Green LED is ON when nudging is active
Nudging Buzzer
-
-
Warbling tone when nudging is active. Volume adjustable via a po-
tentiometer. Turn OFF using the Nudging Buzzer ON/OFF switch.

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4.5. Power-up and test
Ensure that all job site wiring and connections are cor-
rect and then apply power. The controller beeps several
times for approximately 2-3 seconds. After this start-up
beeping, the output relay will energize if no obstruction
exists so that the doors can close. However, when there
is any obstruction of the detection area, the relay will re-
main de-energized until the area is free and all light cur-
tain beams are clear of obstruction.
Status
LED
LED ON
LED OFF
FLASH
Power
OK
No Power
N/A
Light
curtain
N/A
Nudging
N/A
Rx
Error
ON
Constant
OK
Failure
Tx
Error
ON
Constant
OK
Failure
Figure 11: Normal operation
With the obstruction of one or more beams the light
curtain output relay will deenergize and the 'OUT' LED
will illuminate to indicate an obstruction has occurred.
Installation tip
When the obstruction buzzers switch is in the ON
postion using the sliding switch (see Figure 11), an
audible signal occurs when a beam has been
obstructed. If the nudging buzzer switch is in the ON
position and an obstruction has occurred for longer than
the nudging time, an audible warbling signal will occur.
This function is very helpful after installation to check the
proper function of the light curtain. To shut off all audible
signals, set both the obstruction buzzer and the nudging
buzzer switches to the OFF position.
If the light curtain does not operate as described in this
section, please refer to Chapter 6 'Troubleshooting'.
4.6. Snap on the vison shield
The vision shield is a protective plastic part that covers
the transmitter and receiver and is available as part of
several light curtain kits or as an optional component. It
allows infrared light to pass through with virtually no loss
of light intensity and is made from a polycarbonate
material that is both robust and chemically resistant to
many alcohols and cleaning solvents.
When vision shields are included in the light curtain kit,
the installation of the vision shields is easy and simple.
However, please take note that the vision shield cannot
be easily adjusted once it is installed. Starting at the right
point is optimal. Otherwise you may need to remove the
vision shield and start again.
1. Start at the BOTTOM of the door. Align the end of
the vision shield to the end of the mounting or
spacer profile.
2. Snap in the FIRST FEW INCHES by spreading the
side walls of the vision shield.
3. Snap in FROM BOTTOM TO TOP and bend the
vision shield slightly backwards.
4. Clean the vision shield for a nice appearance with a
soft and dry towel.