Lenze E82xVxxxKxxxxx - Manual (Page 493)

Safety engineering
Operating mode
14
l
493 EDS82EV903 EN 3.0
14.2 Operating mode
34
X3.1
33
K32
K31
CINH
5 V
µC
PWM
PWM
-
~
U
V
W
 ƒ
‚
Ax
K
SR
&
8200vec110
Fig. 14−1 Internal connection of the "Safe torque off" function with 3 electrically isolated circuits
Area : Pulse inhibit via safety relay K
SR
; forcibly guided feedback for monitoring the safety
relay
Area ‚: Controller inhibit (CINH, e.g. standard I/O X3/28), optional feedback via a digital
output (Ax, e.g. standard I/O X3/A1)
Area ƒ: Power output stage
Activating "Safe torque off"
The "Safe torque off" status is activated via two different disconnecting paths which are
independent of each other:
1st disconnecting path: pulse inhibit via safety relay K
SR
(terminal X3.1/33, X3.1/34)
ƒ In the case of LOW level at terminals X3.1/33, X3.1/34, the safety relay K
SR
is
deactivated.The driver supply of the power section drivers is interrupted. The
inverter no longer receives pulses.
ƒ The disconnection of the safety relay K
SR
has to be monitored externally, so that a
failure of this disconnecting path can be detected. X3.1/K31, X3.1/K32 is a forcibly
guided break contact, i.e. if the safety relay K
SR
has been deactivated ("Safe torque
off" activated), the contact is closed.
2nd disconnecting path: controller inhibit via input signal at terminal CINH (e.g. at
standard I/O terminal X3/28)
ƒ The input signal CINH is fed to the microcontroller system and the PWM unit. In the
case of LOW level at terminal CINH, the output of pulses to the inverter is inhibited
in the microcontroller system.
ƒ The disconnecting path "Controller inhibit" can be evaluated optionally via a digital
output. Further information can be gathered from the chapter "Functional test"
(
¶ 498).
"Safe torque off" is activated if there is a LOW level at both disconnecting paths.
Independent of the other channels, every single channel suppresses the output of pulses
to the inverter (single−fault−safety).