Safety Function Characteristic Data; Maintenance, Security, And User Accessibility - Danfoss VLT Integrated Servo Drive ISD 510 System Operating Instructions Manual

ISD Safety Concept

8.11 Safety Function Characteristic Data

General information
Response time (from switching on the
input until torque generation is
disabled)
Lifetime
Data for EN/ISO 13849-1
Performance level (PL)
Category
Mean time to dangerous failure (MTTF
for maximum system size of 32 servo
drives on each STO line
Diagnostic coverage (DC)
Data for EN/IEC 61508 and EN/IEC 62061
Safety integrity level (SIL)
Probability of failure per hour (PFH) for
maximum system size of 32 servo drives
on each STO line
Safe Failure Fraction (SFF)
Hardware fault tolerance (H)
Subsystem classification
Proof test interval
Table 8.5 Safety Function Characteristic Data
8.12 Maintenance, Security, and User
Accessibility
Maintenance
Operate the STO function at least once per year.
Security
If security risks exist, take suitable measures to prevent
them.
User accessibility
Restrict access to the servo drives, SAB, and other ISD 510
servo system components if access to them could result in
safety risks.
MG75K102
Operating Instructions
<100 ms
20 years
d
3
) 233 years (limited to
d
100 years if the ISD
510 servo system
forms an entire safety
channel)
60%
2
-8
<5 x 10 /h
>95%
0
Type A
1 year
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