Note:
If T1 > 1a is needed in low demand mode of operation, SIL 1 / PL c levels are used
and PFD is calculated separately.
ACS880-17LC/37LC drives without a main breaker
Note:
ACS880-17LC/37LC drives can be delivered without a factory-installed main breaker.
Customer-installed components are not included in the safety data calculations. These
values must be added to the calculations by the customer.
T1
3) 4)
[a]
Mis-
sion
time
[a]
CCF
HFT
Cat.
DC
2)
[%]
PF-
Davg
PFH
1)
[1/h]
PL
SC
SIL /
SIL-
CL
Circuit
break-
er
ACS880-17LC/
37LC type
20/1
20
65
0
2
>90
8.1E-
4
7.3E-
7
d
3
2
-
-17LC/37LC without
air circuit breaker
delivery
3AXD10000097591 Rev E
1) PFH values are according to EN ISO 13849.
2) DC for low demand mode is 90% (determined by the DC of the worst component in the subsystem).
3) See the recommendation of use CNB/M/11.050 published by the European co-ordination of notified bodies for lower T1
requirement.
4) T1 = 20a is used with high demand mode of operation. T1 = 1a is used with low demand mode of operation. See also
section Proof test interval.
Note:
If T1 > 1a is needed in low demand mode of operation, SIL 1 / PL c levels are used
and PFD is calculated separately.
￭
Safety component types
Safety component types as defined in IEC 61508-2:
•
emergency stop button: type A
•
safety relay(s): type A
•
main contactor(s): type A
•
main breaker: type A.
￭
Safety block diagrams
The components that are included in the safety data calculations are shown in the safety
block diagram(s) below. The components not included in the delivery are not included in
the safety data calculations.
The components that are included in the safety circuit are shown in the safety block diagrams
below for different drive types.
Diagram 1: ACS880-07 drives, frames R6 - R11 and ACS880-17/-37 drives, frame R8,
with one contactor (A145 – AF1250) or circuit breaker
E-stop
button
Auxiliary
safety
relay
Extension
safety
relay
Main
contactor
or main
breaker
E-stop
safety
relay
Technical data 43
