Safety data
The safety data for the Safe torque off function is given below.
Note:
The safety data is calculated for redundant use, and does not apply if both STO channels
are not used.
T
M
(a)
CCF
HFT
SC
Cat.
DC
(%)
MTTF
D
(a)
PFD
avg
(T
1
= 5 a)
PFD
avg
(T
1
= 2 a)
PFH
(T
1
= 20 a)
(1/h)
SFF
(%)
PL
SIL/
SILCL
Frame size
20
80
1
3
3
≥90
23970
1.1E-06
4.5E-07
5.0E-11
>99
e
3
R8i
20
80
1
3
3
≥90
16330
1.3E-06
5.5E-07
6.2E-11
>99
e
3
2×R8i
20
80
1
3
3
≥90
12390
1.6E-06
6.5E-07
7.3E-11
>99
e
3
3×R8i
20
80
1
3
3
≥90
9980
1.9E-06
7.6E-07
8.4E-11
>99
e
3
4×R8i
20
80
1
3
3
≥90
8360
2.1E-06
8.6E-07
9.5E-11
>99
e
3
5×R8i
20
80
1
3
3
≥90
7190
2.4E-06
9.6E-07
1.1E-10
>99
e
3
6×R8i
20
80
1
3
3
≥90
6310
2.6E-06
1.1E-06
1.2E-10
>99
e
3
7×R8i
20
80
1
3
3
≥90
5620
2.8E-06
1.2E-06
1.3E-10
>99
e
3
8×R8i
3AXD10000078136 F
•
The following temperature profile is used in safety value calculations:
•
670 on/off cycles per year with Δ
T
= 71.66 °C
•
1340 on/off cycles per year with Δ
T
= 61.66 °C
•
30 on/off cycles per year with Δ
T
= 10.0 °C
•
32 °C board temperature at 2.0% of time
•
60 °C board temperature at 1.5% of time
•
85 °C board temperature at 2.3% of time.
•
The STO is a type B safety component as defined in IEC 61508-2.
•
Relevant failure modes:
•
The STO trips spuriously (safe failure)
•
The STO does not activate when requested
•
A fault exclusion on the failure mode “short circuit on printed circuit board” has been
made (EN 13849-2, table D.5). The analysis is based on an assumption that one
failure occurs at one time. No accumulated failures have been analyzed.
•
STO response times:
•
STO reaction time (shortest detectable break): 1 ms
•
STO response time: 2 ms (typical), 25 ms (maximum)
•
Fault detection time: Channels in different states for longer than 200 ms
•
Fault reaction time: Fault detection time + 10 ms
•
Indication delays:
•
STO fault indication (parameter
31.22
) delay: < 500 ms
•
STO warning indication (parameter
31.22
) delay: < 1000 ms
196 The Safe torque off function
Summary of Contents for ACS880-37LC
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 37LC drives Hardware manual ...
Page 2: ......
Page 4: ......
Page 78: ...78 ...
Page 116: ...116 ...
Page 134: ...5 Set the real time clock 134 Maintenance ...
Page 144: ...144 ...
Page 167: ... Dimension drawing examples ACS880 37LC 0390A 7 with main contactor Dimensions 167 ...
Page 169: ...ACS880 37LC 1270A 7 with common motor terminal cubicle Dimensions 169 ...
Page 170: ...ACS880 37LC 1940A 7 with common motor terminal cubicle 170 Dimensions ...
Page 172: ...Location and size of input terminals Contact ABB for details 172 Dimensions ...
Page 174: ...Inverter module cubicle with two R8i modules bottom cable exit 174 Dimensions ...
Page 175: ...Inverter module cubicle with three R8i modules bottom cable exit Dimensions 175 ...
Page 176: ...Brake chopper cubicle D150 176 Dimensions ...
Page 178: ...Cubicle width 300 mm top cable exit 178 Dimensions ...
Page 179: ...Cubicle width 400 mm bottom cable exit Dimensions 179 ...
Page 180: ...Cubicle width 400 mm top cable exit 180 Dimensions ...
Page 181: ...Cubicle width 600 mm bottom cable exit Dimensions 181 ...
Page 182: ...Cubicle width 600 mm top cable exit 182 Dimensions ...
Page 198: ...198 ...
Page 200: ...200 ...
