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Outputs per power output (LA 724i)
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24
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Electrical isolation from control unit
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By opto-triac and optocoupler specified according to VDE 0884
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Insulation voltage
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5 kV
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5.3 kV
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Electrical isolation between power outputs
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No
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Load voltage (for star connection)
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230 V AC
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187 V ... 264 V (TN system)
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50 Hz/60 Hz (47 Hz ... 63 Hz)
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Total current per phase and module
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Max. 32 A
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Current per busbar
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Max. 120 A
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Output voltage
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Full waves or half-waves switched at zero crossover
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Output current
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|
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5 A
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Max. 7 mA
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Power loss
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Typ. PV = 0.7 W/A x I + 0.18 W/A2 x I2
(I = control current in the channel)
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Switching capacity (simultaneity 100 %)
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Max. 1000 W per channel at 230 V
Note:
the total current per phase of 32 A must not be exceeded.
Min. 75 W per channel
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Parallel connection of heat emitters to one channel
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|
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Typ. 5
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- Minimum power per radiator
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200 W
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Total switching capacity per LA 724i (ambient temperature = 40 °C)
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- Without forced ventilation
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14.4 kW
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|
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22 kW
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Type of load
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Resistive loads with max. 15 times the cold current in the 1st half-wave (if necessary, flash heat emitters can be measured at Siemens)
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Overload
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5 times the rated current for 20 ms
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Thermal protection
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Yes, by NTC thermistor
92 °C ± 3 °C: warning to host controller via PROFIBUS DP
100 °C ± 3 °C: switching off of power outputs
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Short-circuit protection
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One 5 A/250 V quick-blow fuse per output
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Overvoltage protection
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By Transil diodes
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Connection line
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R
max = 14 W
(short-circuit protection is thus ensured)
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Dimensions of LA 724
(W x H x D)
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50 mm x 480 mm x 210 mm
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Weight, approx.
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5.3 kg
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