Pilz PMCtendo SZ Series Operating Manual page 47

Technical data
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
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
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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
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shock loading can be found in the "Ambient conditions" chapter.
Calculation of work done by friction per braking process
W
B,R/B
The sign of M
negative if the movement runs vertically down.
Calculation of the stop time
t
dec
Operating Manual PMCtendo SZ
1002405-EN-04
B,Rmax/h
2
J × n
= ×
tot
182.4 M
is positive if the movement runs vertically upwards or horizontally and it is
L
= 2.66 t × +
1B
9.55 M
may not be exceeded. Activate other braking processes
may initially be up to 50% less when braking from full
Bdyn
M
Bdyn
± M
Bdyn L
n J ×
tot
×
Bdyn
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