2.4 Audio Unit - Machine Room

Description

This audio unit is designed for machine room installation. Compared with the other types, it has some unique features:

  • The audio unit contains a telephone set with the HandsFree/receiver modes for good function in a noisy environment.
  • The attached telephone is equipped with a keypad for function selection and system programming.
  • The attached telephone does not ring. The audio unit is equipped with a siren that is loud enough for a noisy environment.
    • The machine room audio unit can be shared by multiple lifts.

The audio unit is equipped with a lift blocking contact in case LN fails to call for help.

 

Operating instructions

This unit may only be used by authorised persons such as the lift maintenance staff.

The TRIPHONY button activates voice communication between all units with the same lift number.

The ALARM button can be used for calls to the dispatching centre. The ALARM button backlight (not required by standards) allows you to find the unit in a dark environment.

In both cases, it is necessary to pick up the attached phone.

If the attached phone is picked up and neither ALARM nor TRIPHONY is pressed, you can make use of other functions; refer to the machine room voice menu.

Before You Start

Requirements

  • Be sure to connect the telephone set included in the audio unit delivery. No other telephone type may be used except with the consent of the manufacturer.
  • The lift control circuit must be equipped with a function blocking input in case the LN is unable to provide connection with the dispatching centre.

Product completeness check

Check the product for completeness before installation please:

  • 1 audio unit
  • 1 telephone set (a separate unit including accessories and the manual)
  • 2 wall dowels
  • 2 dowel screws
  • 7 address setting jumpers

Mounting

Typically, the audio unit including a telephone set is mounted onto a wall using available dowels and screws. The recommended machine-telephone distance is approximately 10 cm. The maximum distance is determined by the interconnecting cable delivered together with the telephone.

Electric Installation

Description of connectors

Release the screw on the right-hand side and open the connector cover. There are three connectors:

 

Address Setting

There two groups of jumpers under the transparent front cover. For their meanings see the printing located directly under them.

  • Left-hand group of 4 jumpers: leave them in the "machine room" position.

Note

  • You can set another position too – if, for example, you want to have a classic telephone and thus program the CU on the shaft bottom, you can use this audio unit and set the jumper into the appropriate position.
  • Right-hand group of 8 jumpers: address setting. If the machine room is shared by multiple lifts, you can use one audio unit and set more addresses with the available jumpers. This is impossible with other types of audio units!

Note

  • If more addresses have been set in the audio unit, press the TRIPHONY button to activate communication with the lift with the lowest address.

Caution

  • Avoid the audio unit address duplicity.

Bus Connection

Remove the terminal board from the connector, connect the wires and replace the terminal board. The connection polarity is arbitrary.

Warning

  • Connection to different, e.g. higher-voltage, cables leads to damage or destruction of the audio unit.

Caution

  • The unit is powered via a 2-wire bus from the central unit. Unplugging of the bus from the CU causes switching off of the unit.

Telephone Connection

Use the telephone set including the cable with telephone terminals that are part of the audio unit delivery.

Caution

  • The audio unit is not functional without a telephone set connected.
  • Connecting a telephone set of different type may result in difficulties, such as system failure.

Testing

To test the function, pick up the handset. If no other call is currently being made, you can hear the machine room voice menu.

 

Lift Blocking Function Connection

Caution

  • This function may be mandatory if the local applicable regulations require so at the time of installation.

Blocking procedure: the contact opens whenever a telephone line fault is detected or the LN batteries are low. Connect the contact to the appropriate controller input of the lift or a group of lifts. The control electronics shall ensure that, upon contact opening, the lifts that are in operation arrive in the nearest station and open the door. If the audio unit is shared by multiple lifts, all lifts must stop the function identically.