MSG11-5715-743/EN: AC20F Series - Hardware Installation Manual
68 (148)
MSG11-5715-743/EN 24.04.2023
EMC
In addition to the mandatory requirements of EN61800-3, the STO functionality has been subjected to
testing for immunity at higher levels. In particular, the STO function (only) has been tested for radiated
immunity according to EN61800-5-2:2017 Annex E up to 6GHz which includes frequencies used by mobile
transmitters in general.
8.4
STO Operation
Terminal Identifications
Frames 2 - 5
Frames 6 - 10
Terminal Ident
Description
STOA
STO Input Channel A:
-
0V or not connected, STO is ‘Active’ on channel A. Drive
will not run.
-
24
V, STO is ‘Disabled’ on channel A. Drive will run,
providing 24 V is present on STO input channel B too.
-
Input is optically isolated from all other inverter terminals
except STOB.
0V
STO 0V Reference:
-
Signal return for STO input channel A and STO input
channel B.
-
This terminal must be connected to
earth
at one common
point in the drive system.
STOB
STO Input Channel B:
-
0V or not
connected, STO is ‘Active’ on channel B. Drive
will not run.
-
24
V, STO is ‘Disabled’ on channel B. Drive will run,
providing 24 V is present on STO input channel A too.
-
Input is optically isolated from all other inverter terminals
except STOA.
