Technical data
3
i
j
| BA 14.0190 - EN | 02/2007
15
Engagement time
With switching on the AC side, the engagement times are prolonged approximately by the
factor 5, for connection see page 28.
Spark suppressors for the rated voltages, which are to be connected in parallel to the contact
are available for engagement on the DC side. If this is not admissible for safety reasons, e.g.
with hoists and lifts, the spark suppressor can also be connected in parallel to the brake coil
(for connection see page 28.
A reduction of the brake torque via the adjuster nut prolongs the engagement time and
reduces the disengagement time. If the prolongation is too long, an anti-magnetic plate - to
be assembled between stator and armature plate - is available. The plate reduces the
engagement time and prolongs the disengagement time.
3.5
Operating frequency / friction work
20
Sizes
31
18
25
Fri
ct
ion
w
ork
Q
[J
]
Operating frequency S
h
[h
-1
]
KL 468-XXX.tiff
Fig. 4
Friction work as function of the operating frequency
S
hperm
=
−
S
hü
ln
1
−
Q
Q
E
Q
perm
=
Q
E
1
−
e
−
Shü
Sh
The permissible operating frequency ”S
hperm
” depends on the friction work ”Q” (see Fig. 4).
An operating frequency of ”S
h
” results in the permissible friction work ”Q
perm
”.
With high speed and friction work, the wear increases strongly, because very high
temperatures occur at the friction faces for a short time.
