LA724I SSR power output module производства Siemens

• Connection of the 24 V supply voltage
• Connection of the solid state relay via mating connector
• Connection of the external SM724I current measuring module
• Connection of voltage feedbacks from the load circuits
• Connection of phases L1, L2, L3 and the neutral conductor via busbars
  (only required with voltage diagnostics)

Output data

• 24 channels with a digital control signal 24 V (8 outputs per phase)
• Max. 20 kW switching capacity at 230 V or 36 kW at 400 V per output

Supply voltage monitoring

The connected 24 V supply is monitored for failure. In the event of failure, the outputs to the solid state relay (SSR) are deactivated.

The drivers of the control outputs are monitored for their function.

Fuses

Fuses are to be set externally for each channel.

Diagnostics facilities

Two alternative diagnostic methods are possible:

• By diagnosing the voltages from the load circuit, the following faults can be detected:
  • Solid state relay (SSR) cannot be activated, supply line to the SSR is interrupted or external channel fuse has failed
  • The solid state relay (SSR) cannot be deactivated; emitter or cable break
• By diagnosing via the external SM724I current measuring module, the following faults can additionally be detected:
  • Rated output on channel is exceeded
  • Rated output on channel is not reached

This diagnosis is recommended for detecting faults in emitters connected in parallel.

Recommendation for solid state relay (SSR) to be used

SIRIUS SC semiconductor relay/contactor, e.g. 3RF2350‑1AA02:
semiconductor contactor 50 A, 40 °C, control voltage 24 V, screw-type connection