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LA724I power output module производства Siemens

LA724I power output module

The LA724I power output module is the universal power output module with a maximum output of 1,150 W per channel with 24 channels.

LA724I power output module

Outputs per power output module

24

Galvanic isolation from control unit

By means of opto-triac and optocoupler specified according to EN 60747-5-2

Insulation voltage

 

  • Opto-triac

5 kV

  • Optocoupler

5.3 kV

Galvanic isolation of power outputs from each other

no

Load voltage (for star connection)

 

  • Rated value

230 V AC

  • Permissible range

187 ... 264 V AC (TN system)

  • Frequency

50/60 Hz (47 ... 63 Hz)

Max. total current per phase and module

32 A

Current per busbar, max.

120 A

Output voltage

Full or half-waves switched during zero crossing

Output current

 

  • Maximum value

5 A

  • Residual current, max.

7 mA

Power loss

Typ. PV = 0.7 W/A x I + 0.18 W/A2 x I2
(I = control current in the channel)

Max. switching capacity (100% simultaneity)

1 150 W per channel at 230 V

Note:

The total current per phase must not exceed 32 A.

Min. 75 W per channel

Parallel connection of heat emitters to one channel

 

  • Number, typ.

5

  • Minimum power per heat emitter

200 W

Total switching capacity per LA 724I (TU = 40 °C)

 

  • Without forced ventilation

14.4 kW

  • With forced ventilation

22 kW

Load type

Resistive load with a maximum of 15 times the cold current in the first half wave. (In the case of flash emitters, this can lead to a reduction of the permissible switching capacity. These emitters can be measured at Siemens.)

Overload

5 times the rated current for 20 ms

Protective measures

 

  • Thermal monitoring
    • Response threshold

Yes (by NTC thermistor)

92 °C ± 3 °C: Alarm to higher-level controller via PROFIBUS DP

100 °C ± 3 °C: Deactivation of the power output modules

  • Short-circuit protection

One fast blow 5 A/250 V fuse per output

  • Overvoltage protection

By Transil diodes

Connecting cable

Rmax = 14 W
(this ensures short-circuit protection)

Dimensions (W x H x D)

50 mm x 480 mm x 210 mm

Weight

Approx. 5.3 kg


  • Connection of the heat emitters via mating connectors
  • Channel fuses on the front
  • Heat dissipation possible with the optional LM724 fan module
Output power
  • 24 power channels of 230 V each (8 outputs per phase)
  • Max. 1 000 W switching capacity per output
  • Max. 7 360 W switching capacity per phase
  • Power triacs with zero crossover switching
  • Protection of triacs and opto-triacs against overvoltages by Transil diodes
Forced ventilation

Depending on the switching capacity and ambient temperature, the power output module may have to be forced ventilated. An LM724 fan module is available as an option for this purpose. For detailed information see Manual.

Temperature monitoring

There is an NTC thermistor on the heat sink for monitoring its temperature. This temperature-dependent resistor outputs a signal to the S7-300 at 92 °C ± 3 °C. A second switching threshold at 100 °C ± 3 °C switches off the power outputs of the module.

Fuses

Each channel of the LA 724I power output module has an externally-accessible 5 A fuse to protect the power triac and a 32 A fuse per phase to limit the phase current.

Diagnostics facilities

Diagnostics functions are provided as standard to detect the following faults:

  • Internal fuse defective or triac at high-resistance
  • Triac failed
  • External fault such as blown fuse, heat emitter or cable breakage

If several heat emitters are connected to one output in parallel, failure of an individual heat emitter is detected by means of extended diagnostics.

Design

Type

Screw-fit mating connector

(3 units required for each power output module)

40018384

5 A fuse, quick-response

200021116


Код Заказной номер Описание Вес (кг) Заказать
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