Safe standstill
Operating mode
11
11.2
11.2-2
EDSVF9333V EN 3.0-06/2005
Two signals must be preset so that the ”safe standstill” state can be started
at any time:
ƒ Pulse enable: X11/33, X11/34 - safety relay K
SR
, activation of the driver
supply
ƒ Controller enable: X5/28
”Safe standstill” is started when both signals are deactivated.
As soon as the ”safe standstill” state is activated, the protective circuit
prevents the motor from restarting by the two different and independent
methods.
ƒ Disconnecting the supply voltage for the control modes of the power
section driver, i. e. pulses of the microcontroller system to the inverter
are not transmitted anymore.
– If X11/33, X11/34 is deactivated, the safety relay K
SR
is released. The
supply voltage for the control modules of the power section driver is
switched off. No pulses are transmitted to the inverter anymore.
ƒ Deactivating the pulses of the microcontroller system to the inverter
(controller inhibit).
– The input signal of X 5/28 is lead to the microcontroller system and
the PWM unit.
– Every time the input signal changes to LOW, the pulse output is
inhibited in the microcontroller system.
A disconnection of the safety relay K
SR
must be monitored externally to be
able to identify a malfunction of the safety relay. For this purpose, the
position of the tripping contact is reported back to the contacts X11/K31,
X11/K32 in a forcibly-guided way. X11/K31, X11/K32 are NC contacts, i. e.
the contact is closed when the safety relay K
SR
(”safe standstill” active) is
released.
The monitoring of the function ”controller enable” is described in chapter
”functional test”. ( 11.4-1)
Description
To Next Page
Loading...
Need help?
General
