Lenze E94AYAE SM301 - Manual (Page 42)

Safety engineering
Device modules
Safe speed measurement and position detection
1
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42 EDS94AYAE EN 7.0
1.2.7 Safe speed measurement and position detection
For reliable speed and position detection, you must connect a safety−approved sin/cos
encoder to terminal X8 (Sub−D).
Alternatively, you can connect a 2−encoder system, consisting of motor encoder and
position encoder from SM301 V1.3. When selecting a 2−encoder system, you can also
select a resolver as motor encoder.
From SM301 V1.4 onwards, the resolver can be selected as motor encoder without needing
an additional position encoder. The response time of the encoder monitoring must be set
to 50 ms or 100 ms.
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
From SM301 V1.2:
12/50/100can be
parameterised
( ^ 1.8.4)
Resolver ±10000 / no. of
resolver pole pairs
1 parameterisable
SM301 V1.3:
12/50/100
From SM301 V1.4 onwards:
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 due to 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 SM301 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 SM301.
The speed determined by the standard device and the safety module is checked for
plausibility. Up to SM301 V1.2, the maximum deviation (after a filtering of approx. 2
seconds) is set as a fixed limit value of 20 rpm. The filter time of approx. 2 s is part of the
diagnostic function and is independent of the response time. From SM301 V1.3 onwards,
this tolerancelimit can be parameterised (C15411).