NORD Drivesystems BU0530 - Manual (Page 51)

9 Technical data
BU 0530 GB-3712 51
9.3 Data for the digital inputs
Function Specification
(only DIN1…4,6,7)
Input voltage +24V
Voltage tolerance - 50% +25% (12V…30V)
High level (V
T+
) ≥ 11V
Low level (V
T+
) ≤ 3.5V
Input resistance 6.1k Ω (typical)
Input capacitance 10nF (typical)
Reaction time ≤ 5ms
Requirements made of OSSDs Test pulse width ≤ 500 µs
Duty (high level) ≥ 90 %
Di stance between double 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 DIN1 to DIN4: PFH = 588.39 FIT
Proportion of safe failures DIN1 to DIN4: SFF = 37.34%
Safety category
(as per to EN ISO 13849-1)
Cat. 1
Performance Level
(As per EN 13894-1)
PL c
The mean time until a hazardous
failure MTTF
d
= "High" (>100 years)
Diagnostic coverage level No DC
Lifetime TM = 20 years