Safe Torque Off 6-15
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
Normal Operation
In normal operation, there can be a small time difference between changes of state on X11/01 and X11/03, due to
different delays in the operation of two sets of relay contacts.
States:
1 Both inputs are low. STO prevents the drive from starting. User output is ON. This is the āsafe torque offā
state of the drive.
2 Both inputs are high. Drive is able to run under software control. User output is OFF.
3 One input is high and the other input is low. Drive cannot start due to STO action. User output is OFF.
Normal operation allows this state to persist for up to 1.6 seconds which is the minimum fault detection
time required to generate a fault (3.0 seconds is the maximum). These tolerable time differences are
normally caused by switches or relays; they should be kept as short as possible.
Channel B: X11/03
Output: X11/05, X11/06
STATE
0V
24V
0V
ON
OFF
To Next Page
Loading...
