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Supplementary data
}
Sin/Cos output signals 1Vss, reference voltage
}
Sin/Cos output signals 1Vss, differential
9.1.5.2
Requirements of the drive controller
}
Parameters for the control loops and motor control must be set in such a way as to guar-
antee stable operation.
Drag error detection (see below) must be capable of operating in accordance with the re-
quirements of the safety function.
}
The motor must be operated with a current impressing control procedure, based on the
rotor position (field-oriented control). If the analogue track signals are idle, field-oriented
control will brake and/or stop the rotor.
}
The drive controller must be in position control operating mode.
}
If a maximum error variable is exceeded (set/true comparison) the drive controller must
switch to a fault condition and stop the drive (drag error detection). The error reaction to
drag error detection should be a controlled motor stop.
}
Fault detection via the error variable with subsequent shutdown must meet the require-
ments of the safety function, with regard to reaction times for example.
}
The drive controller must evaluate the same incremental/SinCos signals from the encoder
for control as are processed by the safe evaluation device (important on encoders with
combined analogue/digital interface).
9.1.5.3
Safety-related architecture
To calculate the safety function you will need the following data for the "sensor" subsystem
and the subsystem "PSSu K F EI":
Sensor
Category
2
The values for DC refer to the standard EN 61508.
Operating Manual PSSu K F EI
1003303-EN-03
SRP/CS
Sensor
Sensor
non-safe encoder
MTTFd
DC
Manufacturer-
90 %
specific
SRP/CS
Logic
PSSu K F EI
Logic
+
Diagnostic
Drive Control
Diagnostic
Subsystem PSSu K F EI
Operating mode
Monitoring
1 sensor
SRP/CS
Logic
Actuator
PFH (1/h)
1,80E-08
| 65
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