Safe Speed Monitoring (Ssm) - Siemens Sinamics G120 Function Manual

Safety integrated
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Description
3.7 An overview of the principle of operation of the safety functions
3.7.6

Safe Speed Monitoring (SSM)

What is the effect of the SSM safety function?
The inverter with active SSM function monitors the motor speed. The inverter signals whether
the speed is above or below a limit value.
Table 3-9
1. The SSM function cannot be selected or deselected using
2. The inverter compares the motor speed with an adjustable
3. If the speed is less than the limit value, then the inverter sig‐
Figure 3-8
The SSM safety function is standardized
The SSM function is defined in IEC/EN 61800-5-2:
"The SSM function supplies a safe output signal to indicate whether the motor speed is below
a specified limit value."
⇒ The SSM inverter function is in conformance with IEC/EN 61800-5-2.
Application example
Example
A centrifuge may only filled below a
certain minimum velocity.
44
An overview of the principle of operation of SSM
Safe Speed Monitoring (SSM)
external control signals, in the appropriate setting, it is always
active.
limit value.
nals "Speed below limit value" via a fail-safe digital output or
via PROFIsafe.
SSM
The principle of operation of SSM
Safety Integrated - SINAMICS G110M, G120, G120C, G120D and SIMATIC ET 200pro FC-2
Possible solution
The inverter safely monitors the centrifuge speed and enables
the process to advance to the next step using the status bit
"Speed below limit value" via PROFIbus.
Function Manual, 01/2017, FW V4.7 SP6, A5E34261271B AD
Standard inverter functions linked
with SSM
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