Kendrion Binder Magnete GmbH
Operating Instructions 76 ..P..B00
Last updated: 30 Dec. 2009
Page 26
9. Definitions
(based on: DIN VDE 0580 July 2000, not exhaustive)
Switching torque M
1
torque acting on the shaft during brake or clutch slip
Rated torque M
2
switching torque specified by the manufacturer to identify the brake.
The rated torque M
2
is the mean value of at least 3 measurements of
the maximum switching torque M
1
after completion of the transient
response.
Transmissible torque M
4
highest torque that can be applied to the engaged brake or clutch
without causing the brake/clutch to slip
Residual torque M
5
torque transmitted by the released brake or clutch
Load torque M
6
torque acting on the drive of the engaged brake or clutch; determined
by the power requirement of the driven machine at a given speed
Switching work W
heat generated by friction inside the brake or clutch as a result of the
switching operation
Maximum switching work W
max
maximum switching work to which the brake or clutch may be exposed
Switching power P
switching work converted into heat per unit of time
Maximum switching power P
max
maximum permitted switching work converted into heat per unit of time
Coil ON time t
5
time between power on and power off
Coil OFF time t
6
time between power off and power on
Total cycle time t
7
coil ON time plus coil OFF time
Duty cycle
percentage relationship of coil ON time to total cycle time
Switching operation
one complete switching on and off operation
Switching frequency Z
number of regular switching operations per hour
Response delay during coupling t
11
time between power off (releasing systems) or power on (engaging
systems) and beginning of torque increase
Rise time t
12
time it takes to reach 90% of the M
2
rated torque from the beginning of
the torque increase
Coupling time t
1
response delay t
11
plus rise time t
12
Response delay during disconnection t
21
time between power on (releasing systems) or power off (engaging
systems) and beginning of torque decrease
Fall time t
22
time it takes for the torque from the beginning of the torque decrease
to fall to 10% of the M
2
rated torque
Disconnection time t
2
response delay t
21
plus fall time t
22
Slip time t
3
time from the beginning of the torque increase up to the end of the
braking process (brakes) or until the synchronisation torque M
3
has
been reached (clutches)
Making time t
4
response delay t
11
plus slip time t
3
(braking or acceleration time)
Operating condition at operating temperature
condition at which the steady-state temperature is reached. The
operating temperature corresponds to the overtemperature according
to DIN VDE 0580 plus the ambient temperature. Unless otherwise
specified, the ambient temperature is 35°C.
