Puls Dimension Q-Series, Manual, Page: 10 / 27

QTD20.241
Q-Series
24V, 20A, DC I
NPUT
9. L
IFETIME
E
XPECTANCY AND
MTBF
DC 600V
Calculated lifetime expectancy*) 220 000h
*)
At 24V, 10A and 25°C
78 000h At 24V, 10A and 40°C
119 000h At 24V, 20A and 25°C
42 000h At 24V, 20A and 40°C
MTBF**) SN 29500, IEC 61709 801 000h At 24V, 20A and 25°C
446 000h At 24V, 20A and 40°C
MTBF**) MIL HDBK 217F 267 000h At 24V, 20A and 25°C; Ground Benign GB25
204 000h At 24V, 20A and 40°C; Ground Benign GB40
*) The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service life) and 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 capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15
years (131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) MTBF stands for M ean T ime B etween F ailure, which 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.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.
10. F
UNCTIONAL
D
IAGRAM
Fig. 10-1 Functional diagram
+
+
-
-
V
OUT
DC
ok
Output
Over-
Voltage
Protection
Input Filter
Inrush Current
Limiter
Transient Filter
Input
Fuses
(in + and -
pole)
Output
Voltage
Regulator
Power
Converter
Output
Filter
DC ok
Relay
Output
Voltage
Monitor
Output
Power
Manager
Temper-
ature
Shut-
down
Overload
LED
DC-OK
LED
+
-
Oct. 2016 / Rev. 2.0 DS-QTD20.241-EN
All parameters are specified at 24V, 20A, 600Vdc input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
10/27