Lenze E94AYAF, Manual, Page: 36 / 76

Safety engineering
Device modules
Safe speed measurement and position detection
1
36
EDS94AYAF EN 1.0
1.2.8 Safe speed measurement and position detection
For a safe speed and position detection, you must connect a safety−approved sin/cos
encoder to terminal X8 or a resolver to X7.
You can alternatively connect a two−encoder system consisting of a motor and a position
encoder.
Safe speed measurement
Motor encoder
system Max. speed Synchronism Response time of
encoder monitoring
Error response
[rpm] [%] [ms]
Encoder
±
16000 1.5
12
Error stop STO
12/50/100can be
parameterised
( 1.8.4)
Resolver
±
10000 / no. of
resolver pole pairs
1 parameterisable
50/100
( 1.8.4)
Tab. 1−3 Detailed features
Explanations on the data:
ƒ
Synchronism
Variation of the speed determined in comparison with the current speed value.
ƒ
Response time of encoder monitoring
Time required to detect faults caused by continuous signal errors at the encoder
interface.
Note!
If speed monitoring is active and the standard device detects the inverter error
characteristic (C00002=71) or determines the motor parameters (C00002=72),
the error message "Safe speed invalid" is displayed. Both functions cannot be
completed since the SM302 activates STO. These two states generally occur
only once during commissioning.
Therefore, these functions should be carried out before the speed monitoring
is activated in the SM302.
The functions depending on speed, direction of rotation or position must not be
parameterised if "No encoder" is set. The plausibility check rejects such implausible
settings until they have been parameterised correctly.
Tip!
The motor encoder position and, if required, position encoder position are
32−bit values in the safety module. The lower−order 16 bits contain the part of
a motor revolution and the higher−order 16 bits contain the multiple of a
motor revolution. Examples:
1/4 motor revolution
65536/4 16384 / 0x0000’4000
1/2 motor revolution 65536/2 32768 / 0x0000’8000
1 motor revolution 65536/1 65536 / 0x0001’0000
2 motor revolutions 2*65536 131072 / 0x0002’0000