ABB FSO-21, User Manual

Page: 106 / 540

106 Safety functions
Safe stop emergency (SSE)
The SSE function can be configured either with immediate STO or with emergency
ramp.
With immediate STO
The behavior of the SSE with immediate STO is identical to the STO function (see
section
Safe torque off (STO) on page 67 ) except that parameter Restart delay after
STO is not used.
You can configure the SBC function to be activated before, at the same time with, or
after the drive STO function. When you use an encoder, you can also configure the
SBC function to be activated at a user-defined speed limit.
With emergency ramp
The behavior of the SSE with emergency ramp is identical to the SS1 function (see
section
Safe stop 1 (SS1) on page 79 ) except that different time and ramp monitoring
parameters are used. The SSE function uses SAR0 parameters to monitor and/or
define
the emergency ramp. Drive ramp parameters cannot be used.
When you use the SBC function with the SSE function, you can configure the SBC
and drive STO combination to be activated at a user-defined speed limit while
ramping down to zero speed. You can also define a delay so that the SBC is activated
first at the user-defined speed limit and the drive STO after the delay.
This section describes the different versions of the SSE function separately without
and with an encoder.
Note : Always set the parameters related to the SSE function to have the correct trip
limit hit and fault reaction behavior. An internal monitoring of the FSO module can
trigger the SSE function even if you have not defined an external request signal.
These internal monitorings trigger SSE:
• SMS or SLS function speed limit hits
• SDI safety function position limit hit
• PROFIsafe fault
• FSO module I/O fault, FSO module overtemperature, FSO module power supply
fault.