Safe Torque Off
4-16
AC890PX AC Drive
Fault Operation
A fault is always detected when X11/01 and X11/03 are in opposite states for more than 3.0 seconds.
States:
1
Both inputs are low. STO prevents the drive from starting. User output is ON. This is the “safe torque
off” state of the drive.
3
One input is high and the other input is low. STO prevents the drive from starting. In this example,
this state persists for more than 3.0 seconds (being the maximum fault detection time), after which
time the STO logic transitions to state 4 without further changes in input state. The 890 has detected
single-channel operation.
Channel A: X11/01
Channel B: X11/03
Output: X11/05, X11/06
STATE
1
4
3
24V
0V
24V
0V
ON
OFF
> 3.0s
Summary of Contents for AC890PX Series
Page 17: ...2 5 Product Overview AC890PX AC Drive 890PX bottom wire entry ...
Page 144: ...The Keypad 7 9 AC890PX AC Drive The Menu System Map ...
Page 145: ...7 10 The Keypad AC890PX AC Drive The Menu System Map continued ...
Page 328: ...Programming D 88 AC890PX AC Drive Functional Description ...
Page 386: ...Programming D 146 AC890PX AC Drive Setpoint Drive Frequency Frequency 1 Frequency 2 ...