WITTUR WSG-TB.3 series, Operating Instructions Manual

Page: 102 / 148

Preface and general information
INTORQ | BA 14.0210 | 12/2016 6
1.4 Abbreviations used
Letter symbol Unit Designation
F
R
N Rated frictional force
I A Current
I
H
A Holding current, at 20 °C and holding voltage
I
L
A Release current, at 20 °C and release voltage
I
N
A Rated current, at 20 °C and rated voltage
M
A
Nm Tightening torque of fixing screws
M
dyn
Nm Braking torque at a constant speed of rotation
M
K
Nm Rated torque of the brake, rated value at a relative speed of rotation of
100 rpm
n
max
rpm Maximum occurring speed of rotation during the slipping time t
3
P
H
W Coil power during holding, after voltage change-over and 20 °C
P
L
W Coil power during release, before voltage change-over and 20 °C
P
N
W Rated coil power, at rated voltage and 20 °C
Q J Quantity of heat/energy
Q
E
J Max. permissible friction energy for one-time switching, thermal parameter of
the brake
Q
R
J Braking energy, friction energy
Q
Smax
J Maximally permissible friction energy for cyclic switching, depending on the
operating frequency
R
m
N/mm
2
Tensile strength
R
N
Ohms Rated coil resistance at 20 °C
R
z
µm Averaged surface roughness
S
h
1/h Switching frequency: the number of switching operations evenly spread over
the time unit
S
hue
1/h Transition operating frequency, thermal parameter of the brake
S
hmax
1/h Maximum permissible operating frequency, depending on the friction energy
per switching operation
s
L
mm Air gap: the lift of the armature plate while the brake is switched
s
LN
mm Rated air gap
s
Lmin
mm Minimum air gap
s
Lmax
mm Maximum air gap
s
HL
mm Air gap for manual release
t
1
ms Engagement time, sum of the delay time and braking torque - rise time
t
1
= t
11
+ t
12
t
2
ms Disengagement time, time from switching the stator until reaching 0.1 M
dyn