This time scheme diagram illustrates the operation of the SSM1 function.
2
3
SSM indication
B
1
A
4
Motor speed
Time
SSM1 limit positive (parameter SSMx.13)
A
SSM1 limit negative (parameter SSMx.12)
B
1. The motor speed goes above the SSM limit positive. The SSM indication goes off.
2. The motor speed goes below the SSM limit positive. The SSM indication goes on.
3. The motor speed goes below the SSM limit negative. The SSM indication goes off.
4. The motor speed goes above the SSM limit negative. The SSM indication goes on.
￭ Drive modulation loss when encoder feedback is used
When using encoder feedback: If drive modulation is lost during the safe deceleration ramp,
and the motor speed does not decelerate within monitoring limits due to coasting, FSO
generates a monitoring limit hit indication and activates STO based on measured motor
speed in the following situations:
• SAR1 ramp monitoring with SS1, SLS or SDI functions
• SAR0 ramp monitoring with SSE function as Emergency ramp
• time monitored ramp with any of previously mentioned safety functions.
Note: Parameters SLSx.05 and SLSx.06 are used only with safe speed estimate. With
encoder feedback, they have no effect. However, if an encoder failure occurs, and parameter
S_ENCGEN.11 is set to Est switch not active load, FSO switches from encoder feedback
to safe speed estimate.
30 Option description
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