Safe Speed Monitor (Ssm) - Lenze i950 Commissioning Manual

19.9

Safe Speed Monitor (SSM)

The function monitors the limited speed set.
The function is activated if:
the monitoring limits are parameterised, or
•
the values are non-zero.
•
WARNING!
A safety-rated encoder system must be used.
Without an encoder, this safety function cannot be used.
▶ Apply a safety-rated encoder system to use this function.
NOTICE
The SSM function does not feature any hysteresis.
Oscillating response of the safe output during operation in the proximity of the speed limit
parameterised.
Oscillating response of the safe output when slowly passing the speed limit parameterised.
▶ Avoid continuous operation at the speed limit parameterised.
Functional description
During operation within the limit values, the SSM status is set on the safety bus within the
limits 0x2870:0020x2870:002.
The SSM status is assigned to the safe output as safe speed monitor (amount)
0x28B2:0010x28B2:001.
If the amount of the safe speed adopts the value "0", the SSM function is deactivated.
The status bit in 0x28B30x28B3
Parameter
Address Name / setting range / [default setting]
0x28B2:001 SSM parameters: SSM: Monitored speed
• Read only: x rpm
0x28B3 SSM within limits
• Read only
0 Deactivated
1 SD-Out1 positive logic
2 SD-Out1 negative logic
SSM
n
0x28B2:001
0
0x28B3 1
0
influences the control of available outputs.
t
t
Info
Safety functions
Safe Speed Monitor (SSM)
393