ABB ACS880-17, User Manual

Page: 27 / 58

Option description and instructions 27
Emergency stop, stop category 1 with ramp monitoring
This time scheme diagram illustrates the operation of the Emergency stop, stop category 1
safety function with ramp monitoring a safety encoder is used. This option uses the Safe
stop 1 (SS1) function of the FSO-21 module. For more information, see
FSO-21 safety
functions module user’s manual (3AXD50000015614 [English]).
Case A : The motor speed goes below the zero speed limit within the user-defined stop
ramp monitoring window.
Case B : The motor speed does not follow the user-defined stop ramp monitoring window.
Time
Motor speed
1 2
5a 6a
E-stop button
(SS1 request)
Drive STO
status
Reset button
B
3a
A
4a
Indication lamp
Time
Motor speed
1 2 6b 7b
E-stop button
(SS1 request)
Drive STO
status
Reset button
B
3b
A
4b
Indication lamp
5b