Instruction Manual

Functional safety with NORD SK 200E frequency inverters
72 BU 0230 GB-2712
10.5 Data for the safe pulse block
(only for SK 210E, SK 215E, SK 230E and SK 235E)
Function
Specification
Input voltage
+24 V
Voltage tolerance
±25 % (18  V)
Operation at OSSD
-
Power consumption
(mean value)
125 mA for SK 2xxE in Size 1 to 3
40 mA for SK 2x0E in Size 4
Peak current
(peak, when switching on or at the
OSSD)
00 mA for SK 2xxE in Size 1 to 3
0 mA for SK 2x0E in Size 4
Cable length

Line capacitance
 nF per connected inverter
Switch-on delay
 ms
Reaction time
 ms ( 65 ms typical)
Cycle time
 s
Requirements made of OSSDs
 µs

uty factor)
Safety integrity level (IEC 61508)
SIL3
Probability of a hazardous failure per
hour
PFH = 0 for SK 2xxE in Size 1 to 3
PFH = 0.0058 FIT = 5.8*10
-12
/h for SK 2xxE in Size 4
Probability of a hazardous failure on
call-up
PFD = 0 for SK 2xxE in Size 1 to 3
PFD = 5.23*10
-5
for SK 2xxE in Size 4
Proportion of safe failures
SFF = 100 % for SK 2xxE in Size 1 to 3
SFF = 99 % for SK 2xxE in Size 4
Safety category
(as per to EN ISO 13849-1)
Cat. 4
Performance level
(as per to EN 13849-1)
PL e
The mean time until a hazardous
failure
MTTF
d
= "High" (>100 years)
Diagnostic coverage level
DC cannot be determined (PFH=0) for SK 2xxE in Size 1 to 3
DC > 99 % for SK 2xxE in Size 4
Lifetime
TM = 20 years