BONFIGLIOLI ACTIVE CUBE Series Applications Manual page 11

Stop paths
S1IND (STOA)
S7IND (STOB)
The test required for monitoring is performed by the frequency inverter automatical-
ly. If the test results negative, the frequency inverter cannot be switched on any-
more. Starting is possible again only after the error has been repaired and the next
test has been completed successfully.
Truth table
In the truth table, the states of the safety-relevant inputs STOA and STOB for activa-
tion and deactivation of the safety function STO are listed.
STOA
0
0
1
1
5-second monitoring
It will be checked if the two inputs STOA or STOB are switched on within an interval
of less than 5 sec for requesting the release of the frequency inverter output stages.
If function STO is triggered by removing one of the signals from inputs STOA or
STOB, the status changes to "STO triggered". Now, the unit waits that both inputs
are switched off. If this has not been done within 5 s after occurrence of this state,
an error is triggered (5-second monitoring).
If, during operation, an error is detected, the output stage is switched off, the release
is reset ("0") and the frequency inverter signals an error. This status can only be left
by switching off ("0") the two release inputs STOA and STOB.
− Different signal states on inputs STOA or STOB start the 5-second monitoring
− Within 5 seconds, the same signal must be present of both inputs, otherwise an
error will be signaled (F1205)
The function of external installation can be checked via the "5-second monitoring" by
actuating the protection device.
ACU-STOV1-01SV2-03 en
03/11
µC
PWM
Diagnosis and
monitoring
Control unit
STOB
Safety function "Safe Torque Off" (STO) has been triggered. The
0
frequency inverter signals no error in STO function.
STO is triggered. Monitoring for error in frequency inverter or ex-
1
ternal circuitry (5-second monitoring). After 5 seconds, an error is
signaled.
0
STO is not triggered. Release for operation.
1
Power unit
Truth table
Description of state
Mains
M
11