Faults - malfunctions, Service life graph, Faults malfunctions – Pilz PNOZ s4 C 48-240VACDC 3 n/o 1 n/c User Manual
Page 13
PNOZ s4
Operating Manual PNOZ s4
21396EN13
13
Power, In1, In2, Out, Reset, Fault
Diagnostics: The operating mode selector switch "mode" is in its start position
(vertical position)
}
Remedy: Switch off the supply voltage and set the required operating mode
on operating mode selector switch "mode".
Faults malfunctions
}
Contact malfunctions: If the contacts have welded, reactivation will not be possible after
the input circuit has opened.
Service life graph
The service life graphs indicate the number of cycles from which failures due to wear must
be expected. The wear is mainly caused by the electrical load; the mechanical load is negli
gible.
U
B
24 VDC
Example
}
Inductive load: 0,2 A
}
Utilisation category: AC15
}
Contact service life: 2,000,000 cycles
Provided the application requires fewer than 2,000,000 cycles, the PFH value (see tech
nical details) can be used in the calculation.
To increase the service life, sufficient spark suppression must be provided on all output
contacts. With capacitive loads, any power surges that occur must be noted. With contact
ors, use freewheel diodes for spark suppression.