Safety engineering
Device modules
Safe speed measurement and position detection
1
45
EDS94AYAE EN 6.0
Single−encoder concepts with resolvers
Please observe during the configuration of such systems:
If only one feedback system is used in connection with these safety applications, the
applicable safety standard, IEC 61800−5−2 (Adjustable speed electrical power drive
systems, Part 5−2: Safety requirements − Functional), poses special requirements for the
connection between feedback system and motor shaft. This is due to the fact that
dual−channel safety systems are, as a matter of fact, mechanically designed as
single−channel systems at this point. If this mechanical linkage is extremely
overdimensioned, the standard allows for fault exclusion for the fault conditions "Shaft
breakage" and "Shaft slippage".
Hence, there are acceleration limit values for the individual drive solutions which must not
be exceeded:
Synchronous
servo motors
Encoder Max. permissible angular
acceleration
Min. time per 1000 r/min
speed lift
Type Product key [rad/s
2
] [ms]
MCS 06
Resolver
RS0
56000 1.9
MCS 09 ... 19 19000 5.5
MDXKS 56 / 71 17000 6.2
Asynchronous
servo motors
Encoder Max. permissible angular
acceleration
Min. time per 1000 r/min
speed lift
Type Product key [rad/s
2
] [ms]
MCA 10 ... 19
Resolver
RS0
22000 4.8
MCA 20 ... 26 22000 4.8
MQA 20 ... 26 22000 4.8
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