Safety Characteristic Data; Safe Actuator With One Encoder; Mttf >= 10 Years - Pilz PMCprotego S2-2 Operating Manual

Technical details
9.1

Safety characteristic data

9.1.1

Safe actuator with one encoder

Please note the following fault detection guidelines:
When the drive is operated with an encoder (standard motor encoder on the servo ampli-
fier), a fault on the encoder system is detected by the safety card as follows:
}
Rotary synchronous motors
Detected within one mechanical revolution of the motor.
}
Linear synchronous motors
Detected within the distance travelled, in accordance with the following formula:
Distance = (Number of poles /2) · Pole pair pitch
Commands in the servo amplifier:
–
–
9.1.1.1 MTTF >= 10 years
Operating EN ISO
mode 13849-1:
2015
PL
Safe actu-
ator PL d
This operating mode requires a motor encoder with MTTF ≥ 10 years.
The motor encoder is already included in the characteristic data, so no more calculations
need to be performed for the "Safe Actuator" subsystem.
The safety-related characteristic data is valid for all safety functions.
All the units used within a safety function must be considered when calculating the safety
characteristic data.
Operating Manual PMCprotego S2-2(-C)
1002529-EN-04
Number of poles: MPOLES
Pole pair pitch: MPITCH
EN ISO EN 62061
13849-1:
SIL CL
2015
Category
Cat. 3 SIL CL 2
Subsystem
Safe actuator
PMCprotego D
PMCprotego S2
Motor encoder with MTTF ³ 10 years
EN 62061 IEC 61511
PFH [1/h] SIL
D
1,35E-07 SIL 2
IEC 61511 EN ISO
13849-1:
PFD
2015
T [year]
M
1,72E-03 20
74