Lenze EVS9332xS - Manual (Page 348)

Safety engineering
Operating mode
11
11.2
l
11.2−1 EDSVS9332S EN 6.0−07/2013
11.2 Operating mode
X11/34
X11/33
X11/K32
X11/K31
X5/28
5 V
µC
PWM
PWM
-
~
U
V
W
 ƒ
‚
DIGOUT
K
SR
9300vec100
Fig. 11.2−1 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 (X5/28), optional feedback via a digital output
(DIGOUT)
Area ƒ: Power output stage
The "Safe torque off" status is activated via two different disconnecting
paths which are independent of each other:
1. disconnecting path: Pulse inhibit via safety relay K
SR
(terminal X11/33,
X11/34)
ƒ In the case of LOW level at terminals X11/33, X11/34, 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.
X11/K31, X11/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.
2. disconnecting path: Controller inhibit by input signal at terminal X5/28
ƒ The input signal at X5/28 is fed to the microcontroller system and the
PWM unit. In the case of LOW level at terminal X5/28, 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" (
¶ 11.5−1).
"Safe torque off" is activated if both disconnecting paths are on LOW level.
Activating "Safe torque off"