The safety outputs K↓ and K↓↓ are also actuated by a safe internal circuit according to
Category 2 Performance Level d.
This circuit switches the safety outputs K↓ and K↓↓ off in the event of an error (e.g.
excessively high temperature at the hoist motor).
The term motor management relates to the off-times for the lifting and lowering move-
ments.
The off-times for the example of lifting are explained below:
Starting at slow speed t
a
:
If S↑ and S↕↕ are actuated together, K↑ is switched on first. At the end of the off-time t
a
,
K↑↑ is switched on.
Stopping at slow speed t
b
:
If K↑ and K↑↑ are active, the output K↑↑ is switched off first at the end of actuation of S↑
and S↕↕. Actuation of K↑ is also stopped at the end of the deceleration time t
b
.
Off-time for slow (t
s
) and fast (t
f
) speed:
If S↑ or S↕↕ becomes inactive, K↑ and K↑↑ are also no longer actuated. If S↑ or S↕↕ is
switched on again directly afterwards, K↑ or K↑ and K↑↑ is only actuated again at the
end of the off-time for the slow t
s
or fast t
f
speed.
Off-time for reversal of direction t
r
:
When the actuation reverses direction, the hoist is first stopped and the corresponding
safety output is actuated at the end of the off-time t
r
.
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