Logical level
Logical level
SMS Request
Violation
SQS Reached
& STO Reached
SQS Active
& STO Active
t
t
t
e30bi351.10
Illustration 57: An SMS Violation. The SQS-STO Function as a Violation Response. SMS: Manual Acknowledgment.
6.3.4 SSR - Safe Speed Range
6.3.4.1 Introduction to the SSR Function
The Safe Speed Range (SSR) safety function monitors that the motor speed stays in parameterized speed range. It is possible to set
and monitor a maximum and a minimum motor speed. The SSR function can be configured with or without ramp monitoring.
After the function has been activated, the deceleration or the acceleration to a safe range can be monitored with the ramp monitor-
ing mode.
The violation response is the SQS function.
The parameters of the SSR safety function are described in 8.10 SSR Parameters.
6.3.4.2 Time Monitoring
The time monitoring mode is always used when SSR is active. In the time monitoring, the SSR function must be reached before the
time that is set with SSR t1 elapses. The monitoring of the speed limit starts after the function is reached.
If the function is not reached in the set time, or the speed limit is exceeded after the function is reached, the SQS function becomes
active as a violation response.
AQ319736045637en-000101 / DPD01798 | 99Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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