Functional Safety – Supplementary manual for series SK 500P
30 BU 0630 en-2020
If a mains fault (short-circuit to earth) occurs in an IT network, the link circuit of a connected frequency
inverter may become charged, even if it is switched off. This results in destruction of the link circuit
capacitors due to overcharging.
• Connect a braking resistor to dissipate excess energy.
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NOTICE!
Operation in IT networks
If a fault is detected in the safety circuit of the Safety Digital Input, pulse generation by the frequency
inverter is switched off. This also affects control of the brake chopper. If the Safety Digital Input is
used (P424 = 1 or P424 = 2), possible triggering faults are:
• Detected fault in the Safety Digital Input hardware
• “Safety SS1 max. time” (P423) exceeded
• Incorrect input of the “Safety CRC” (P499) checksum or the password (P497, P498).
If such a fault occurs, and at the same time there is an earth fault in the IT network, the frequency
inverter cannot be protected against possible overcharging of the link circuit capacitors. The
frequency of hardware faults is very low, so that special care is necessary during commissioning in
the IT network.
It is recommended that parameterisation and earth fault tests, e.g. testing of an earth fault monitor,
are not carried out simultaneously.
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