ABB FSPS-21, Руководство пользователя

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Drive STO state
& indication
2
STO request
Motor speed
Time
1
Description Step
The STO request is received from the safety PLC. The module activates the drive STO function.
The STO indications in the drive and safety PLC go on. 1
The STO request is removed from the safety PLC. The STO function is deactivated and the indica-
tions go off. 2
￭ SS1 with time monitoring
The SS1-t function stops the motor safely by ramping down the motor speed. The FSPS-21
module activates the drive STO function when zero speed limit, defined with parameter
21.06 Zero speed limit , is reached.
The SS1 function uses drive parameter 23.23 Emergency stop ramp to define the stop
ramp, see section Drive parameters related to safety functions (page 43) for more information.
The FSPS-21 module monitors the stop ramp with a time limit. If the motor speed does not
reach the user-defined zero speed limit within the specified time limit, the module activates
the drive STO function, the motor coasts to a stop, and FSPS-21 creates a fault (0x7aa0).
The SS1 time limit 0.0...3276.7 s is set by the safety PLC in PS3 telegram SS1-t_time
variable, see section
ABB_PS3 profile F-Output user data (page 116) .
The operation of the SS1 with time monitoring (SS1-t) is described in the time diagram and
table below.
28 Safety functions