6
Installation and Operation
EDBC250SIO | 2.0
59
NOTE
Defect caused by thermal overload due to excessive inductance!
Setting the inductance and the load current to higher than the specified values
may thermally destroy the digital power output. Destroying the digital power
output may cause the safety function to fail.
Use an external free wheel circuit if the external load exceeds the specified inductance limits.
External free wheel circuit
NOTE
Take heed of the perturbation of the external free wheel circuit
Depending on the actual safety function, it may or may not be affected by the
external free wheel circuit which the safety assessment must take account of.
An external free wheel circuit will transduce the magnetic energy when turning off the
inductive load.
Verify that the external free wheel circuit is designed to withstand the ensuing dissipation
heat.
When connecting the inductive load to the outputs, be sure to limit the negative voltage of the
external free wheel element you choose to anything smaller than -30 V because the digital
output will otherwise transduce the magnetic energy to heat.
NOTE
Note the heat dissipated by the external free wheel element!
If you choose the correct external free wheel element, this element instead of
the safe I/O module will transduce the magnetic energy when turning off the
inductive load.
Verify that the external free wheel circuit is designed to withstand the ensuing
dissipation heat.
I
I
I