Abbreviations Used - Wittur servogearless WSG-S3.4 Instructions De Service

Preface and general information
1.4

Abbreviations used

Letter symbol Unit
F
R
I
I
H
I
L
I
N
M
A
M
dyn
M
K
n
max
P
H
P
L
P
N
Q
Q
E
Q
R
Q
Smax
R
N
S
h
S
hue
S
hmax
s
L
s
LN
s
Lmin
s
Lmax
t
1
t
2
t
3
INTORQ | BA 14.0196 | 04/2016
Designation
N Rated frictional force
A Current
A Holding current, at 20 °C and holding voltage
A Release current, at 20 °C and release voltage
A Rated current, at 20 °C and rated voltage
Nm Tightening torque of fixing screws
Nm Braking torque at a constant speed of rotation
Nm Rated torque of the brake, rated value at a relative speed of rotation of
100 rpm
rpm Maximum occurring speed of rotation during the slipping time t
W Coil power during holding, after voltage change-over and 20 °C
W Coil power during release, before voltage change-over and 20 °C
W Rated coil power, at rated voltage and 20 °C
J Quantity of heat/energy
J Maximally permissible friction energy for one-time switching, thermal
parameter of the brake
J Braking energy, friction energy
J Maximally permissible friction energy for cyclic switching, depending on the
switching frequency
Ohms Rated coil resistance at 20 °C
1/h Switching frequency: the number of switching operations evenly spread
over the time unit
1/h Transition switching frequency, thermal parameter of the brake
1/h Maximum permissible switching frequency, depending on the friction
energy per switching operation
mm Air gap: the lift of the armature plate while the brake is switched
mm Rated air gap
mm Minimum air gap
mm Maximum air gap
ms Engagement time, sum of the delay time and braking torque - rise time
t = t + t
1 11 12
ms Disengagement time, time from switching the stator until reaching 0.1 M
ms Slipping time, operation time of the brake (according to t
3
dyn
) until standstill
11
7