6.2.4.2 Time Monitoring
SOS
SS2 t1
t
Speed
0
SOS Revolution Limit
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Illustration 41: The SS2 Function in the Time Monitoring Mode
The time monitoring mode is always used when SS2 is active. The SOS function becomes active when the time that is set with pa-
rameter SS2 t1 has passed. The SS2 t1 timer starts when the SS2 function starts its operation.
6.2.4.3 Zero Speed Monitoring
SOS Revolution Limit
SOS
SS2 t1
SS2 td2
t
Speed
Zero speed
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Illustration 42: The SS2 Function in the Zero Speed Monitoring Mode
When zero speed monitoring is used, time monitoring is also used. Zero speed monitoring monitors if the motor stops. The stop-
ping of the motor is determined by parameter Zero Speed. When zero speed monitoring is used, the speed going below the zero
speed starts a delay time set in SS2 td2 after which the SS2 function is reached. When the SS2 function is reached, the SOS function
becomes active. The SS2 function must be reached before the time that is set in SS2 t1 elapses. If SS2 t1 elapses first, the STO(+SBC)
function is activated as a violation response.
AQ319736045637en-000101 / DPD01798 | 79Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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