Safety engineering
Device modules
Safe speed measurement and position detection
1
43
EDS94AYAE EN 6.0
Note!
As safe speed, the higher value which results from the comparison of the
dual−channel speed information is used.
The value "Tolerance − speed comparison" must be selected as low as possible.
If a speed/position information fails during operation, this must be detected
by the diagnostic function. It is thus required to exceed the value "Tolerance −
speed comparison" for at least more than two seconds during operation to
ensure the dual−channel redundancy of the encoder information. A too low
value can cause a restricted plant availability.
The speed−dependent and/or direction−of−rotation dependent functions require
information from safe speed measurement. These are the functions:
ƒ Safe stop 2 (SS2)
ƒ Safe operational stop (SOS)
– Following EN 61800−5−2: SOS is designed with speed monitoring
(SM301 V1.2)
– In compliance with EN 61800−5−2: SOS is designed with position monitoring (From
SM301 V1.3)
ƒ Safe maximum speed (SMS)
ƒ Safely limited speed (SLS)
ƒ Safe speed monitor (SSM)
ƒ Safe direction (SDI) (From SM301 V1.3)
ƒ Safely limited increment (SLI) (From SM301 V1.4)
The dependent functions must not be parameterised when "No encoder system" is set. The
plausibility check rejects such ambiguous settings until you have parameterised them
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
To Next Page
Loading...
