Tel: +44 (0)118 933 2533

Fax: +44 (0)118 933 1224

email: sales@teelectronics.co.uk


THE JACKDAW

THE DEVIL'S HIGHWAY

MORTIMER WEST END

READING, BERKS RG7 2AD

UK

CAR LIFT INFRA-RED REMOTE CONTROL SYSTEM

WHY REMOTE CONTROL?

Because itís much more convenient not to have to get out of your car, and itís more secure.

With your remote control you can

all without leaving your car or even opening a window.

WHY USE INFRA-RED?

Since Infra Red (IR) behaves similarly to light, it will pass through your car windscreen; however, because itís like light it wonít travel through walls and floors. When you call a lift it comes to your floor, a pretty useful characteristic. Radio signals pass through masonry and are reflected and refracted by metals Ė with a radio remote itís easy to get a response from the "wrong" receiver with the result that the lift goes to the wrong floor.

The range of a TE IR transmitter is about 15m, which is more than sufficient for car lift applications. A radio remote could offer greater range, but do you want to call a lift from 400m?

WHAT DOES TE ELECTRONICS OFFER?

We produce a range of transmitters, receivers and lift interface units which can be tailored to your individual needs.

TRANSMITTERS:

  • Single button keyfobs which can be used in simple two floor systems to call a lift.

When the vehicle is fully inside the lift car, either the lift doors close automatically and the lift car transfers to the other level, or a second burst from the keyfob initiates the door closing and transfer

Alternatively, the user can press buttons which are mounted on the inside of the lift car side wall and are accessible via the driverís door window. This technique also allows access to multiple levels.

2btn_Tx_Supreme2.JPG (50954 bytes)

INTERNAL RECEIVERS:

Internal Receivers are for use within areas of the car park that are protected from the weather. Types are available for surface mounting, ceiling mounting and flush mounting.

  • The surface mounting types are housed in Polycarbonate enclosures or in standard BS1363 type double mains plates. The Polycarbonate housings are similar to the ones shown in the "External Receiver" section below.

  • Ceiling mounting types are useful inside lift cars. They are mounted in the centre of the ceiling and activated by signals reflected from either door of the lift car; this allows the vehicle to face either way and still need only one receiver.

BS_Surface_Rx.JPG (63918 bytes)
Flush mounting types can be built into matching lift furniture housings, eg stainless steel, or can be housed in standard BS1363 type double mains plates. The BS1363 type needs a standard double back box of 25mm depth. SS_Flush_IR_Rx.JPG (129393 bytes)
 

EXTERNAL RECEIVERS:

External receivers are for situations exposed to the elements.

The external receivers are housed in IP66 Polycarbonate enclosures and are mounted on an assembly which has an adjustable hood and tilts the receiver slightly downwards.

The downward tilt is optimised for mounting heights of around 3m.

The hood shields the Infra Red sensor from direct sunlight (the sun is a powerful Infra red transmitter and can swamp the receiver with "signals").

The mounting plate is compatible with standard conduit outlet boxes or can be fixed directly to any surface.

LIFT INTERFACES:

The Remote Control System interfaces with the lift system via Lift Interfaces.

Generally each receiver will have an interface, although there are situations where two receivers drive one interface on an "either/or" basis.

Interfaces can be independently housed or can be housed with the receiver in the lift furniture or in a Polycarbonate housing. Alternatively, they can be supplied for DIN rail mounting. These would typically be mounted with other Lift Control equipment within the Lift Control cabinet.

The electrical connection to the Lift system is via volt-free relay contacts.

Each interface will have from one to four change-over relays with gold flashed contacts and RC contact suppression. These can be used in any circuits from "dry" to 240V ac at 8A.

Typically the relay contacts would be used to substitute or duplicate the function of push buttons that operate the lift control system.

In many situations each receiver has a single function that is determined by itís location, eg "Call Lift" would be located near the access to a lift car; "Transfer" would be inside the Lift Car. In these cases the Lift Interface needs only a single relay.

The interface is powered by 230V/115V ac mains and provides the power for the receiver(s). If the receiver is remote, it connects to the interface via a lightweight low voltage signal cable. This has from three to eight conductors, depending on the system.

4ch_DIN_Rail_Rly.JPG (210367 bytes)

CHOOSING A MOUNTING SITE FOR THE RECEIVERS

The Infra Red signals act in the same way as visible light. The receivers should be in direct line of Sight from the keyfobs for normal operation. Reflected IR signals can be used but the range will reduce depending on the nature of the surface. White or shiny metal surfaces are good reflectors. The use of reflected signals is useful, for example, inside a Lift Car where a ceiling mounted single receiver can be used for vehicles that may be facing either (eg, entering or leaving). The userís IR signals are reflected from the end doors of the Lift Car. The range requirement in this case is small.

Although resistant to optical interference, it is still best to mount the receivers to minimise direct illumination by tungsten or fluorescent lighting or sunlight.

The external receiver has an adjustable hood which should be set to allow direct line of site for normal keyfob signals but obscure other inputs. Be sure to mount the external receiver in "Portrait" mode with the receiver lens at the top. The internal receivers can be mounted in any orientation.

SECURITY

Some lift Control Systems may also fulfil a security role, eg opening access gates. In this case the system must be highly resistant to interference from extraneous signals. Various features of the system help to meet this requirement

In addition, for critical and secure applications, the above code conditions have to be fulfilled at the beginning of a transmission and again 0.7s later (the keyfobs transmit for 1.5s).

*NB: For four function receivers, 4 of the bits in the code are allocated to the outputs.

INSTALLATION

All units have 2 part screw terminal connectors allowing cables to be pre-wired if convenient.

If the receiver is remote from the interface they should be connected in accordance with the supplied Connection Diagram.The cable type is not critical. 7/0.2 stranded is convenient and will give operation up to several 10s of metres. If the run is near to mains cables it would be best to use screened cable.

The receivers and keyfobs can be set to one of 16 possible addresses. The receiver address is set by SIL switch. The keyfob address is set by solder links. Additional combinations are factory settable . The address of the delivered units is stated in the delivery documentation.

TYPICAL OPERATION

The keyfob is used to call the lift or request transfer in the same way as the equivalent buttons on a wall but with the convenience of remote operation. Approach the lift, point the keyfob at the lift receiver and press the"CALL" button. On receipt of the signal the receiver front panel LED will change from green to red for the duration of the received signal and the lift will be called. When within the lift car press the "TRANSFER" button.

The keyfob transmits the signal for a minimum of 1.5seconds. In systems that need secure operation, the receiver checks again for the presence of a valid signal about 0.7s after receipt and if it is still present it operates the appropriate lift control relay for 0.7s. This checking and short delay is by-passed in the case of an emergency STOP signal.

The keyfob LED indicator ceases to show if the battery is down to 50% terminal voltage (the transmitter OP is then 80%). This gives advance warning of the need to change the battery. The battery life is in excess of 12 months normal operation. Replacements, type GP23A or equivalent, are available from tobacconists, car accessory and photographic shops, or from T E Electronics.

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OTHER INFRA RED PRODUCTS:

T E Electronics manufacture a range of Industrial Control and Security Infra Red products. Please contact us if you canít find what you are looking for here Ė we may still be able to offer a solution.

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