Inhibit Input; Efficiency And Power Losses; Lifetime Expectancy And Mean Time Between Failure - Allen-Bradley 1606-XLS960BUFFER Reference Manual

Inhibit Input

Efficiency and Power
Losses
Lifetime Expectancy and
Mean Time Between Failure
12
Buffering can be disabled or interrupted with the Inhibit input (pin 9). To use
the Inhibit input, connect pin 6 to either the positive pole of the terminal
voltage or to the external control voltage, and connect pin 9 to the
corresponding negative pole.
Inhibiting the unit also discharges the internal capacitors. Charging of the
capacitor is not possible when the buffer module is in Inhibit mode.
For the wiring scheme, see
Figure 21 on page
Attributes
Signal voltage
Signal current
Inhibit mode
Isolation voltage
Attributes
Efficiency Typ
Power losses Typ
Attributes
Calculated lifetime expectancy
(2)
MTBF SN 29500, IEC 61709
(2)
MTBF MIL HDBK 217F
(1) The calculated lifetime expectancy that is shown in the table indicates the minimum operating hours (service life). This
lifetime expectancy is determined by the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is
specified in operational hours and is calculated according to the manufacturer specification of the capacitor. The
manufacturer of the electrolytic capacitors only states a maximum life of up to 15 years (131,400 h). Any number exceeding
this value is a calculated theoretical lifetime, which can be used to compare devices.
(2) Mean Time Between Failure (MTBF) is calculated according to statistical device failures, and indicates reliability of a device.
It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product. An
MTBF value is a statistical representation of the likelihood of a device to fail. An MTBF value of for example, 1,000,000 h
means that statistically one unit fails every 100 hours if 10,000 units are installed in the field. However, it cannot be
determined if the failed unit has been running for 50,000 h or only for 100 h.
Rockwell Automation Publication 1606-RM105A-EN-P - July 2020
Figure 9 on page
21.
Values and Notes
Max 35V DC (between pin 6 and pin 9)
Max 4 mA, current limited
The unit does not buffer (or stops buffering) if the
— voltage between pin 6 and pin 9 is higher than 10V.
Below 6V buffering functions again.
See Dielectric Strength on page 17.
Values Notes
>99% Power supply mode, 40 A output current, capacitors fully charged
1.9 W Power supply mode, 0 A output current, capacitors fully charged
Values
189 000 h
(1)
536 000 h
2 114 000 h
3 937 000 h
272 000 h
433 000 h
95 000 h
143 000 h
11, Figure 20 on page
Notes
Stand-by mode, 40 °C (104 °F)
Stand-by mode, 25 °C (77 °F)
Stand-by mode, 40 °C (104 °F)
Stand-by mode, 25 °C (77 °F)
Stand-by mode, 40 °C (104 °F), Ground Benign GB40
Stand-by mode, 25 °C (77 °F), Ground Benign GB25
Stand-by mode, 40 °C (104 °F), Ground Fixed GF40
Stand-by mode, 25 °C (77 °F), Ground Fixed GF25
21, and