Special features & accessories for central unit RZ-24

Emergency power supply for RZ-24

General information

• The emergency power supply allows for a short time to buffer the hold-open system during a power cut.
• The length of this hold-up time depends mainly on the power consumption of the connected components.
• As energy storage devices, capacitors are used instead of accumulators. They are less sensitive to temperature influences, have shorter charging times and a much longer service life.
• When using this emergency power supply, the RZ-24 central unit has to be in the large casing. In this casing is enough room for placing the battery pack.
• Its connection cable is simply plugged in the provided jack on the printed circuit board of the RZ-24.
• During normal operation the battery pack recharges automatically.
• Charging time: about 1 hour for 80 % of the capacity, about 4 hours for 100 % of the capacity.

Hold-up time

• The battery pack has an output of 0.022 Ah
• All of the following values for the length of the hold-up time are only for orientation!

Notes:

• The own consumption of the RZ-24 is 30 mA
• The fire alarm loop of the RZ-24 sets off at a tension of about 16 VDC
• The hold-up times depend on the charging state of the emergency power supply and the ambient temperature

Simplified calculation formula:
Hold-up time in seconds = 80/load [A]

Example:
Hold-open system with RZ-24 and 4 smoke detectors RM 4000 & 1 electromagnet EM GD 70:

• RZ-24: own consumption 0.03 A
• 4 x RM 4000: 4 x 95 μA = 380 μA = 0.38 mA = 0.00038 A
• Electromagnet EM GD 70 = 71 mA = 0.071 A

Total consumption: 0.101 A
Hold-up time = 80/0.101 A = 792 seconds (about 13 minutes)

Time relay circuit board

General information

• The time relay circuit board is incorporated into the RZ-24 central unit
• Therefore, the RZ-24 with the large casing must be used together with the time relay circuit board
• Thanks to the time relay circuit board, different time-controlled functions can be implemented, such as:
  • • • Switching off the signalling after a certain time (e.g. when using the RZ-24 as signal control)
    • Signalling that the door will close shortly (e.g. mandatory in Austria for doors in underground car parks) – release delay
• The desired function and time range are set using 3 DIP-switches and a programming button
• The successful input is indicated by a green LED

Technical data

Additional circuit board for the automatic reset of the RZ-24

General information

After every manual release or fire alarm the complete hold-open system has to be reset. Two steps are necessary:

• Resetting the fire detectors by pressing the hand release switch
• Resetting the complete hold-open system by pressing the RESET key

Only when these two steps have been performed, the electromagnets are supplied with current again and the doors can be locked in the open position. If the doors are used by many different people who are not familiar with the details of the hold-open system, the additional circuit board for the automatic reset of the RZ-24 should be used. Furthermore, the RZ-24 control panel is not always directly accessible. However, since the RESET button is located on the casing of the RZ-24, the additional board not only eases the reset, but also saves time.  The circuit board is simply plugged on the main circuit board of the RZ-24, for which the small casing is enough.

Functioning

• After a power failure, releasing the system by a hand switch or removing and inserting again a fire detector: automatic, RESET of the whole hold-open system.
• After a fire alarm triggered by a fire detector: First is required a manual reset of the detectors by the hand release switch. Then the RESET of the central unit is performed automatically. As the RZ-24 central unit is not always within reach, the RESET key, however, is on its casing, the additional circuit board not only makes the reset easier but also saves time.
• The reset command is automatically carried out every 8 seconds.

Relay circuit board with 1 additional contact

General information

• By default the RZ-24 central unit has a potential-free contact for passing on the tripping. Should this not be sufficient, an additional circuit board with a relay contact can be refitted
• Models with 2 or 4 contacts also available on demand
• Generally we recommend to choose the RZ-24 with the large casing when installing this additional circuit board

Technical data

• 1 relay 24 VDC
• 1 potential-free changeover contact 2A
• Dimensions: 55 x 19 mm