Metronix ARS 2320, Руководство по эксплуатации продукта

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Functional safety technology Page 69
Product Manual „Servo drives ARS 2320, ARS 2340, ARS 2320W, ARS 2360W“ Version 8.0
µP
SM
X3
monitoring
of the
driver supply
X1
6 6 6
3
Holding brake (optional)
1
2
6
5
4
3
15V IGTB driver supply
Triggering of driver supply relay
(driver supply switch off)
High
= driver supply voltage
"ON"Low = "pulse inhibitor" active
"Locking" of holding brake in case of
triggeringDriver supply relay = low
IGBT output stage
Output stage driver
PWM signal inhibition
C
ont
rol
ler
enabl
ing
D
IN
5
O
ut
put
s
tage
enabl
ing D
IN
4
Internal output
stage enabling
Triggering of holding brake
High = lift brake (active)
Low = apply brake
9
21
1
st
shut-down path
2
nd
shut-down path
Floating feedback
contact for driver
supply
X6
2
1
7,8,9
+24V-IO
24 VDC supply
GND 24 VDC
Figure 11: Block diagram “STO” as per EN ISO 13849-1, Category 3 Performance Level d
DANGER!
If the “STO” function is not needed, pins 1 and 2 at [X3] must be bridged..
A “Safe Torque-Off” (STO) as per EN ISO 13849-1, Category 3 Performance Level d, requires two
channels, that is a restart must be safely prevented via two ways, completely independent of each
other. These two ways of interruption, the power supply to the drive and the safe pulse inhibitor, are
called shut-down paths.
1
st
Shut-down path:
Output stage enabling via [X1] (inhibition of PWM signals; die IGBT drivers will no longer be
addressed with modulation patterns).
2
nd
Shut-down path:
Interruption of power supply to the six output stage IGTBs via [X3] by means of a relay (relays will cut
the power supply to the IGBT optocoupler drivers to prevent PWM signals from getting to the IGBTs.).
Between the triggering of the output stage supply relay and the monitoring of the driver supply a
plausibility test will be performed in the µP. This will detect errors in the pulse inhibitor and will also
suppress the error message E-05-2 (“Driver voltage fault”) occurring during normal operation.