SSR safety sub-function with MOVISAFE® CS..A
The SSR function monitors the motor speed within the parameterized speed limits. The parameterized fault response is triggered if the limit values are exceeded. The drive is stopped with the STO or SS1 safety sub-functions, or the information that the limit values were exceeded is transmitted to a safety controller via the safe process data.
When limit values are exceeded and the fault response is STO or SSx, then the fault response must be acknowledged. No acknowledgment is required if the information that limit values were exceeded is reported to a safe controller. When the speed drops below the limit value, the status of the safety sub-functions is set again, taking the parameterized Speed hysteresis v1 (8706.57) into consideration.
Once the safety sub-functions have been activated, the actual speed is monitored for exceeding the maximum speed for the duration of the monitoring delay. After this time, the actual speed is monitored for leaving the range of upper and lower limit speed. Both the upper and the lower limit speed can be positive and negative.
A speed filter can be set for the SSR function. If a speed filter is set, it will be calculated separately for the upper and lower limit speed.
The distance between the upper and lower SSR speed limit must be greater than twice the value of the parameterized Speed hysteresis v1 (8706.57).
