2.1 Central Unit

The 2N Lift8 system is controlled by one Central Unit (CU).

The CU contains an easily replaceable backup battery pack (lead rechargeable battery). The CU is responsible for battery charging and status monitoring. It indicates the charging state, signal strength, telephone line state, bus state core state via five color LEDs. It is also equipped with a USB interface for comfortable configuration, voice message recording and software upgrade.

The CU (version 3.0 and later) is equipped with an Ethernet port, which provides connection to the network via a fixed data connection (WAN). This data connection provides both data transmission (for remote monitoring of connected devices) and voice communication via VoIP. If the CU is equipped with an LTE/UMTS/GSM module, the Ethernet port can be used for the LAN function.

The CU can be equipped with up to two modules providing more data connection options. These modules can be factory pre-installed in the CU or supplied as separate supplementary accessories.

Description

Reset Button Function

• Reset equipment – press the button quickly.
• Restore factory values – press and hold the button until all the LEDs turn red. Then release the button and wait until the SYSTEM LED flashes yellow. Now press the button quickly to delete all the user settings.
• Zero backup rechargeable battery life counter – press and hold the button until all the LEDs turn red. Then release the button and wait until the POWER/BATTERY LED flashes yellow. Now press the button quickly. Perform this function after replacing the backup rechargeable batteries with new ones only!
• Check system completeness – press and hold the button until all the LEDs turn red. Then release the button and wait until the INTERNAL BUS LED flashes yellow. Now press the button quickly to make the system supervise all the installed equipment (splitters, Audio Units etc.) for proper connection and function. Refer to S. 4.8.

USB Port Connection

Recommendation

• Do not keep your PC connected for a long time unless necessary to reduce the computer damage due voltage surge from the telephone line during storms, for example. 

Before You Start

CU Installation Conditions

• The Central Unit (hereinafter referred to as CU) is not intended for outdoor use.
• Do not install the CU onto vibration-producing machines.
• Install the CU vertically to allow air flow for cooling purposes (never cover the CU with any cloth or install it in another closed box).
• You may install the CU into the lift switchboard unless the temperature exceeds the acceptable limit. Remember that a higher ambient temperature reduces the life of backup rechargeable batteries in the CU.
• It is recommended that the CU should be operated in the upright position with the cable openings at the bottom. Such mounting position ensures the lowest temperatures and thus the longest life of the rechargeable batteries. Horizontal mounting is also possible. The upright position with the cable openings at the top (upside down) is forbidden!
• After mounting the CU check that the equipment is firmly fixed in place and cannot come loose and drop down into the shaft.
  
  

Product Completeness Check

Check whether the product package is complete before installation:

• 1 central unit
• 1 main bus terminal
• 4 bus connection terminals
• 4 wall plugs
• 4 wall plug screws 
• 8 cable ties
• 1 battery connecting cables
• 1 brief manual 
• 1 warranty sheet
• drilling template

CU Mounting

It is recommended to install the CU in a room that is secured against unauthorized persons, such as the machine room, switching station, etc. An easily accessible place is exposed to a risk of telephone line misuse or SIM card misappropriation.

The CU is mounted on a wall with the included wall plugs and screws.

CU Electrical Installation

Putting in Operation

1. Keep the CU disconnected from the mains.
2. Top cover removal:
   • Loosen the three screws on the upper cover of the CU.
   • Slide the CU top cover so that you can remove it. 
   • When removing the cover, proceed with caution, be careful about the earth wire connecting the cover with the CU bottom part. Do not disconnect the wire!
3. Connection of components:
   • Using the slide-on terminals supplied with the device, connect the Audio Units, splitters and other components of the system with the CU. Adhere to polarity!
4. Module installation:
   • If the modules are not installed on the CU from the factory, mount the module. Follow the instructions provided in the User Manual for the given module.
5. Connection of batteries:
   • Take the rechargeable batteries out of the package and place them into the CU as instructed. Fix them into the holder and use an 8 mm spanner for tightening. Interconnect the batteries using the included cables but do not connect them to the CU
6. Replace the upper cover on the CU and tighten the cover fitting screws. Doing so make sure that the earthing wire is connected to the cover!
7. Reset the backup battery lifespan counter:
   • Press and hold the button until all the LEDs turn red.
   • Release the button and wait for the LED POWER/BATTERY to flash yellow.
   • Press the RESET button briefly.
8. Connect the CU to the mains supply.

 

Power Supply

• The CU is powered by 100–240 V mains power.

Rechargeable Battery Connection and State Check

1. Keep the CU disconnected from the mains.
2. Loosen the three screws on the upper cover of the CU.
3. Move the upper cover of the CU in such a way that you can remove it.
4. Proceed with caution while removing the cover: be careful about the drain wire connecting the cover with the CU bottom part. Do not disconnect the wire unless there is a reason to do so!

5. Interconnect the rechargeable batteries, but do not connect them to the motherboard.

6. Plug in the CU supply cable into a 230 V socket.

7. Now interconnect the batteries with the motherboard using the FASTON cable (see the Fig. below). Maintain polarity.

   
   

8. Replace the upper cover on the CU and tighten the cover fitting screws. Doing so make sure that the earthing wire is connected to the cover!

After plugging the CU into the socket, the LED (Power/battery) should start to flash (charging). The CU charges the rechargeable batteries until fully charged. After some time, the flashing green LED (charging) should change to a permanently illuminated green LED (battery charged). 

Rechargeable Batteries 

Splitter – CU Bus Connection

Interconnect the CU and splitter using a 6-wire main bus (power + − , audio + − , data + ). Mind the polarity.

Audio Units – Splitter (CU) Bus Connection

The Central Unit contains an internal splitter, to which up to 8 audio units can be connected. The splitter has 2 terminal boards ready for the audio unit connection.

Interconnect the splitter (in CU) and audio units using a two-wire bus. Mind the polarity.

1. Remove the push-in terminal board from the audio unit connectors and connect a two-wire.
2. Connect no more than 4 audio units to one terminal board.
3. Maintain polarity to make the audio units work properly. Refer to the splitter and audio unit labels for correct polarity.

Wiring Requirements:

• The maximum length of the two-wire circuit connected to one splitter is 600 m, including all movable parts (towing cable).
• Use unshielded wires of the cross-section of 0.75 mm².
• Where a towing cable is used, use the neighboring cables and make sure that the nearest neighboring conductors are not a source of interference. If shielded cables are used, connect adjacent conductors to the shielding.
• If you use multicore cables, always use a pair.

• Do not lead the bus in a close vicinity of power cables, via a long distance in particular.

• It is not advisable to lead the bus near the wires connected to the elevator drive.
• You can branch the bus, especially to shorten the total length of all sections.
• A shielded cable is recommended in the case of increased interference. With a shielded cable, the shielding should be continuously connected along the entire cable route. The shielding must be connected to a suitable ground point, preferably to the Central Unit grounding.

Termination Resistance

Connect the termination resistance connector to the first and last device connected to the bus: CU, splitter or I/O module. 

Examples of Connection:

CU Connection to Telephone Network

You can connect the CU to any of the following telephone networks:  

• Ethernet
• LTE(VoLTE)
• PSTN
• UMTS
• GSM
• PBX
• VoIP

PSTN

2N Lift8 works in a broad band regardless of polarity and line parameters (refer to Technical Parameters). Connect it using the enclosed cable with an RJ–12 terminal. It is the most reliable and simplest connection. The disadvantage is the operating cost (fixed fee).

Telephone line requirements

• The line must not be a dual or party one.
• The telephone socket and its wiring are usually the network provider's property and may not be tampered with. 
  
  
  

Other recommendations

• Notify the telephone network provider of your 2N Lift8 installation and submit certification upon request.
• Your follow-up wiring must comply with the relevant safety regulations.
• You are recommended to secure your cabling against pirate connection (with a telephone lock, e.g.).
  
  

Connection via PBX (Private Branch Exchange)

• This is the least-cost solution where a PBX and an unused PBX line are available.

PBX line requirements

• The PBX to be used must work reliably even in the case of power outage. Large PBXs are mostly equipped with a back-up power supply, smaller PBXs usually use PSTN line redirection in the event of power failure. Consult the problem with the technician responsible for your PBX. An error during power outage may result in 2N Lift8 calling an undesired station.
• Relevant call access rights have to be assigned to the PBX line to be used (use a standard telephone set to check whether the line can make outgoing calls to all the required numbers).
• While programming, enter the necessary PSTN code (typically a zero), or (preferably) make the PBX not require a prefix (so-called automatic connection to the provider's telephone line).
• To make the control room – lift calls, you have to know the extension number and how to get through to it (dial-in, DISA, operator).
• The control room – lift connection may not depend on the operator’s presence; no call forwarding to a fax/answering machine in the night mode is allowed, etc.
  
  

Other recommendations

• Make an agreement with the PBX owner regarding operating costs (2N Lift8 outgoing calls are billed at the owner‘s expense with the exception of free calls via “green lines”). 

Operation without external connection

• 2N Lift8 can be used as an intercom without an inserted SIM card or connected PSTN line during the lift fitting time. In this case do not enable the lift blocking function until the telephone line is connected.

LAN Function

Where an LTE module is available in the Central Unit, the CU Ethernet port can be switched into the LAN mode. The port is only used for connecting the network equipped devices in the LAN in this mode. The LTE module provides the VoIP connection. Set parameter 998 to switch the Ethernet port from WAN to LAN. Refer to S. 3. System Configuration for parameter settings.