Beckhoff PS1011-2420-0000, Documentation

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Technical data, mounting, wiring
PS1011-2420-0000 20 Version: 1.0
3.11 Lifetime expectancy
The lifetime expectancy shown in the table indicates the minimum number of operating hours (service life)
and is determined by the lifetime expectancy of the built-in electrolytic capacitors. The lifetime expectancy is
stated in operating hours and is calculated according to the specifications of the capacitor manufacturer.
The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years (131,400h).
Any number exceeding this value represents a calculated theoretical lifetime which can be used to compare
devices.
AC 100V AC 120V AC 230V
Lifetime
expectancy 72,000h 79,000h 102,000h At 24V, 20A and +40°C
167,000h 171,000h 197,000h At 24V, 10A and +40°C
203,000h 223,000h 288,000h At 24V, 20A and +25°C
472,000h 485,000h 557,000h At 24V, 10A and +25°C
3.12 MTBF
MTBF stands for M ean T ime B etween F ailure, which is calculated from the statistical failure rate of the
components and indicates the reliability of a device. It is a statistical representation of the probability of
equipment failure and does not necessarily represent the service life of a product.
The MTBF number is a statistical representation of the probability of equipment failure. An MTBF number of
1,000,000h, for example, means that statistically, if there are 10,000 devices in use, one device will fail every
100 hours. However, it is not possible to say whether the failed device has been in operation for 50,000
hours or only 100 hours.
For these device types the MTTF value ( M ean T ime T o F ailure) is identical to the MTBF value.
AC 100V AC 120V AC 230V
MTBF SN 29500,
IEC 61709 595,000h 611,000h 704,000h At 24V, 20A and 40°C
1,090,000h 1,116,000h 1,252,000h At 24V, 20A and +25°C
MTBF MIL HDBK
217F 274,000h 275,000h 289,000h At 24V, 20A and 40°C; Ground Benign GB40
368,000h 370,000h 386,000h At 24V, 20A and 25°C; Ground Benign GB25
59,000h 59,000h 63,000h At 24V, 20A and 40°C; Ground Fixed GF40
76,000h 76,000h 80,000h At 24V, 20A and 25°C; Ground Fixed GF25