Technical details
Operating Manual PMCprotego S12(C)
1002528EN03
88
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:
– Number of poles: MPOLES
– Pole pair pitch: MPITCH
9.1.1.1
MTTF >= 10 years
Operating
mode
EN ISO
138491:
2008
PL
EN ISO
138491:
2008
Category
EN 62061
SIL CL
EN 62061
PFH
D
[1/h]
IEC 61511
SIL
IEC 61511
PFD
EN ISO
138491:
2008
T
M
[year]
Safe actu
ator with
motor en
coder, MTTF
≥ 10 years
PL d
Cat. 3
SIL CL 2
1,29E07
SIL 2
6,09E04
20
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.
Subsystem
Safe actuator
PMCprotego D
PMCprotego S1
Motor encoder with MTTF
³
10 years
The safetyrelated 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.
