Safe Torque Off
4-18
AC890PX AC Drive
Pulsed Inputs
Some safety equipment, e.g. safety PLCs, regularly pulse the two STO inputs independently in order to
detect a short circuit between them. This is commonly known as OSSD (Output Signal Switch Device). The
890STO inputs are immune to such pulses when these are less than 2ms in width. The product will not react
to such pulses and therefore will not inadvertently invoke the STO function.
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.
2
Both inputs are high, but regularly pulse low independently. External equipment can thus detect a
short circuit between the two STO user inputs. Each input must remain low for 6ms (typical) before
the 890 reacts to it.
2 1
<2ms <2ms typ 20ms
Channel A: X11/01
Channel B: X11/03
Output: X11/05, X11/06
STATE
24V
0V
24V
0V
ON
OFF
Содержание AC890PX Series
Страница 17: ...2 5 Product Overview AC890PX AC Drive 890PX bottom wire entry ...
Страница 25: ...3 4 Installing the Drive AC890PX AC Drive Outline Drawing of AC890PX 132kW 400kW HC471581 page 2 of 2 ...
Страница 144: ...The Keypad 7 9 AC890PX AC Drive The Menu System Map ...
Страница 145: ...7 10 The Keypad AC890PX AC Drive The Menu System Map continued ...
Страница 159: ...7 24 The Keypad AC890PX AC Drive Assembly Procedure Mounting Dimensions for the Remote Mounted 6901 Keypad ...
Страница 250: ...Programming D 10 AC890PX AC Drive VALUE INPUT BREAK VALUE INPUT LOSS LEVEL BREAK ENABLE BREAK TYPE UNPROCESSED ...
Страница 328: ...Programming D 88 AC890PX AC Drive Functional Description ...
Страница 386: ...Programming D 146 AC890PX AC Drive Setpoint Drive Frequency Frequency 1 Frequency 2 ...
Страница 391: ...D 151 Programming AC890PX AC Drive Speed Rated Speed No Load Speed synchronous speed Rated Torque Torque ...