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1.4 Abbreviations used
Letter symbol Unit Name
I A Current
IHAHolding current, at 20 °C and withstand voltage
ILARelease current, at 20 °C and release voltage
INARated current, at 20 °C and rated voltage
MANm Tightening torque of the fixing screws
MKNm Characteristic torque of the brake, characteristic value of a relative
speed of 100 rpm
nmax rpm Maximum occurring speed during the slipping time t3
PHWCoil power during holding, at voltage change-over and 20 °C
PLWCoil power during release, at voltage change-over and 20 °C
PNWRated coil power, at rated voltage and 20 °C
Q J Quantity of heat/energy
QEJMaximally permissible friction energy for one-time switching,
thermal parameter of the brake
QRJBraking energy, friction energy
QSmax JMaximally permissible friction energy for cyclic switching, depending
on the operating frequency
RmN/mm2Tensile strength
RNOhms Rated coil resistance at 20 °C
RzμmAveraged surface roughness
Sh1/h Operating frequency, i.e. the number of switching operations evenly
spreadoverthetimeunit
Shue 1/h Transition operating frequency, thermal parameter of the brake
Shmax 1/h Maximally permissible operating frequency, depending on the
friction energy per switching operation
sLmm Air gap, i.e. lift of the armature plate while the brake is switched
sLN mm Rated air gap
sLmin mm Minimum air gap
sLmax mm Maximum air gap
t1ms Engagement time, sum of the delay time and braking torque
rise time t1=t
11 +t
12
t2ms Disengagement time, time from switching the stator until reaching
0.1 Mrated
t3ms Slipping time, operation time of the brake (according to t11)until
standstill
t11 ms Delay time during engagement, time from voltage switch-off
to the start of torque rise
t12 ms Rise time of the braking torque, time from the start of torque rise
until reaching the braking torque
tue sOverexcitation time
U V Voltage
UHVDC Withstand voltage, during voltage change-over
ULVDC Release voltage, during voltage change-over
UNVDC Rated coil voltage; in the case of brakes requiring a voltage
change-over, Urated equals UL
