NORD Drivesystems BU0230 - Manual (Page 71)

10 Technical data
BU 0230 GB-2712 71
10.4 Data for the digital inputs
Function Specification
Input voltage 24 V -37.5 % +25 %, 15 V…30 V
High level 15 V … 30 V
Low level 0 V … 5 V
Input resistance ~ 9.5 k Ω for the Low level
~ 2.5 k Ω…3,5 kΩ für den High Pegel
Input capacitance Input 1 + 4 = 10 nF
Input 2 + 3 = 1.2 nF
Scan time 1 ms
Reaction time ≤ 5 ms
Requirements made of OSSDs Test pulse width ≤ 500 µs
Duty (high level) ≥ 90 %
Distance between doubl e pulses ≥1ms (note the duty factor)
Safety integrity level (IEC 61508) non, the digital inputs do not have SIL capability
Probability of a hazardous failure per
hour DIN1 and DIN4:
PFH = 786.69 FIT for SK 2x0E in Size 1 to 3
PFH = 811.98 FIT for SK 2x0E in Size 4
PFH = 811.82 FIT for SK 2x5E in Size 1 to 3
DIN2 and DIN3:
PFH = 789.25 FIT for SK 2x0E in Size 1 to 3
PFH = 814.55 FIT for SK 2x0E in Size 4
PFH = 814.39 FIT for SK 2x5E in Size 1 to 3
Proportion of safe failures DIN1 and DIN4:
SFF = 47.77 % for SK 2x0E in Size 1 to 3
SFF = 53.53 % for SK 2x0E in Size 4
SFF = 53.06 % for SK 2x5E in Size 1 to 3
DIN2 and DIN3:
SFF = 54.39 % for SK 2x0E in Size 1 to 3
SFF = 57.39 % for SK 2x0E in Size 4
SFF = 57.00 % for SK 2x5E in Size 1 to 3
Safety category
(as per to EN ISO 13849-1)
Cat. 1
Performance level
(as per to EN 13849-1) PL c
The mean time until a hazardous
failure MTTF
d
= "High" (>100 years)
Diagnostic coverage level No DC
Lifetime TM = 20 years