WITTUR WSG-25, Operating Instructions Manual

Page: 53 / 84

Preface and general information
INTORQ | BA 14.0201 | 04/2016 6
Q
Smax
J Maximally permissible friction energy for cyclic switching, depending on the
switching frequency
R
m
N/mm
2
Tensile strength
R
N
Ohms Rated coil resistance at 20 °C
R
z
μ m 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 switching frequency, thermal parameter of the brake
S
hmax
1/h Maximum permissible switching 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
t
3
ms Slipping time, operation time of the brake (according to t
11
) until standstill
t
11
ms Delay during engagement (time from switching off the supply voltage to the
beginning of the torque rise)
t
12
ms Rise time of the braking torque, time from the start of torque rise until reach-
ing the braking torque
t
ue
s Overexcitation time
U V Voltage
U
H
V DC Holding voltage, after voltage change-over
U
L
V DC Release voltage, before voltage change-over
U
N
V DC Rated coil voltage; in the case of brakes requiring a voltage change-over,
U
N
equals U
L
Letter symbol Unit Designation
Preface and general information
INTORQ | BA 14.0201 | 04/2016 7
1.4 Conventions in use
This document uses the following styles to distinguish between different types of information:
1.5 Notices used
The following icons and signal words are used in this document to indicate dangers and important safety in-
formation:
Safety instructions
Structure of safety instructions:
Spelling of numbers Decimal separator
Point The decimal point is always used.
For example: 1234.56
Symbols
Page reference Reference to another page with additional
information
For example:
16 = refer to page 16
Wildcard Wildcard for options, selections
For example: BFK466-
= BFK466-10
Note Important notice about ensuring smooth
operations or other key information.
SIGNAL WORD
Icon
Indicates the type of danger
Signal word
Characterises the type and severity of danger
Note
Describes the danger
Possible consequences
❚
List of possible consequences if the safety instructions are disregarded.
Protective measure
❚
List of protective measures to avoid the danger.