Restrictions When Using Safety Functions - Siemens SINAMICS G120 Function Manual
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3.5
Restrictions when using safety functions
Not permitted: Operation with pulling loads
Death or severe injury when the motor speed is not monitored
The encoderless actual value sensing does not identify all faults and errors in the closed-
loop motor control. As a consequence, the encoderless safety functions cannot identify
whether a pulling load unintentionally accelerates due to a fault or error in the closed-loop
motor control.
• Do not use any of the extended encoderless safety functions in a drive with a pulling
It is not permissible that you use the encoderless safety functions in applications involving
pulling loads, e.g. in hoisting gear, elevators and unwinders.
Speed monitoring options for pulling loads
● You can implement speed monitoring in machines with pulling loads in one the following
● Coupled electric drives, e.g. test stands and winders/unwinders comprise a driving and a
Not permitted: Motors with different pole pair numbers
Death or serious injury due to unexpected high speeds
If you use the "Drive data set" function to switch over motors with different pole pair
numbers, then the calculated, safety-related speed differs from the mechanical speed of the
motor shaft. As a consequence, the motor shaft can accelerate above the configured
monitoring limits of the safety function. This can result in death or severe injury.
• When using the "drive data set" function, only switch between motors with the same
Monitoring the speed of motors with different pole pair numbers
Implement the speed monitoring in the higher-level control by using a suitable measuring
system to acquire the velocity or speed.
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Function Manual, 04/2014, FW V4.7, A5E34261271B AA
WARNING
load.
ways:
– Select a drive with safety functions that use an encoder, for example SINAMICS S120.
– Implement the speed monitoring in the higher-level control by using a suitable
measuring system to acquire the speed/velocity.
driven drive. Using the extended functions in the drive that has a driving function in a
coupled drive system. In the case of a fault, the drive with the driving function identifies
when a limit value is violated.
WARNING
pole pair number.
3.5 Restrictions when using safety functions
Description
23
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