NORD Drivesystems BU0530 - Manual (Page 52)

Functional safety with NORD SK 500E frequency inverters
52 BU 0530 GB-3712
9.4 Data for the safe pulse block
Function Specification
Input voltage +24V
Voltage tolerance ± 25% (18V…30V)
Operation at OSSD - 20% +25% (19.2V…30V)
Power consumption Size 1 - 6: 100mA, Size 7 140mA, Size 8 - 9 50mA (mean value)
Peak current 400mA (peak, when switching on or at the OSSD
9
) size 1 - 4
Cable length ≤ 20m (refer to EMC, grouping)
Line capacitance ≤ 10nF for each inverter connected
Switch-on delay ≤ 200ms
Reaction time ≤ 200ms (15ms - 35ms typical)
Cycle time ≥ 1s
Requirements made of OSSDs Test pulse width ≤ 500µs
Duty (High level) ≥ 90%
Distance between double pulses ≥1ms (observe the duty factor)
Safety integrity level (IEC 61508) SIL3
Probability of a hazardous failure PFH=0
Safety category
(as per EN ISO 13849-1)
Cat. 4 with dual-channel triggering (separation of VI_S 24V and VI_S 0V)
Cat. 3 with single-channel triggering of the safe pulse block
Performance level (as per to EN
13894-1) PL e
Lifetime TM=20 years
9
Output Signal Switching Device