Pilz PMCtendo SZ Series, Руководство по эксплуатации

Страница: 47 / 88

Technical data
Operating Manual PMCtendo SZ
1002405-EN-04
47
9.6 Holding brake
Synchronous servo motors can be equipped with a backlash-free permanent magnet hold-
ing brake in order to secure the motor shaft when stalled. The holding brake engages auto-
matically if the voltage drops.
Nominal voltage of permanent magnet holding brake: DC 24 V ± 5%, smoothed. Take into
account the voltage losses in the connection lines of the holding brake.
Project configuration
}
In exceptional circumstances, the holding brake can be used for braking from full speed
(following a power failure or when setting up the machine). The maximum permitted
work done by friction W
B,Rmax/h
may not be exceeded. Activate other braking processes
during operation using the corresponding brake functions of the drive controller to pre-
vent premature wear on the holding brake.
}
Note that the braking torque M
Bdyn
may initially be up to 50% less when braking from full
speed. As a result, the braking effect has a delayed action and braking distances be-
come longer.
}
The holding torque of the brake can be reduced by shock loading. Information about
shock loading can be found in the "Ambient conditions" chapter.
Calculation of work done by friction per braking process
2
Bdyn
tot
B,R/B
Bdyn L
M
J n
W
182.4 M M
×
= ×
±
The sign of M
L
is positive if the movement runs vertically upwards or horizontally and it is
negative if the movement runs vertically down.
Calculation of the stop time
tot
dec 1B
Bdyn
n J
t 2.66 t
9.55 M
×
= × +
×