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 | |
| 5 kV |
| 5.3 kV |
Galvanic isolation of power outputs from each other | no |
Load voltage (for star connection) | |
| 230 V AC |
| 187 ... 264 V AC (TN system) |
| 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 | |
| 5 A |
| 7 mA |
Power loss | Typ. PV = 0.7 W/A x I + 0.18 W/A2 x I2 |
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 | |
| 5 |
| 200 W |
Total switching capacity per LA 724I (TU = 40 °C) | |
| 14.4 kW |
| 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 | |
| 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 |
| One fast blow 5 A/250 V fuse per output |
| By Transil diodes |
Connecting cable | Rmax = 14 W |
Dimensions (W x H x D) | 50 mm x 480 mm x 210 mm |
Weight | Approx. 5.3 kg |
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.
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.
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 functions are provided as standard to detect the following faults:
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 |
