Motors-D81.1-complete-English-06-2020

© Siemens 2020
Introduction
Mounting technology
Modular technology
1 ■ Overview
Braking time for motors with brakes
= n
J 1 t 1
tot
9.55
T L ) 1000
(s)
(T b, rated
Connection
Load rating of the rectifier diodes as a function of the ambient
temperature:
Sign for T L :
– T L = Load torque is applying force (in the direction of motion)
100
%
t B
+ T L = Load torque is applying a decelerating force (opposite to
the direction of motion)
Thermal load
When braking, friction energy is applied during the slip phase,
which releases thermal energy.
Friction energy per braking operation
= J n 2 T b, rated tot 182.5
T )
(J)
L
W R
Designation Supply voltage
(T b, rated
I/I max × 100 %
50
G_D081_XX_00605
Sign for T L :
– T L = Load torque is applying force (in the direction of motion)
+ T L = Load torque is applying a decelerating force (opposite to
the direction of motion)
The friction energy per braking operation must be no greater
than the admissible value W Rmax
W R W Rmax (J)
Frictional power
P R = W R · S (J/s)
The friction energy must be no greater than the admissible
value P Rmax
P R P Rmax (J/s)
Block diagram:
Brake
45 (°C) 80 100
U AC
T u
(°C)
G_D081_EN_00606
The high-speed rectifier performs the following functions:
• The coil is first supplied with a voltage
U 2 =0.9 U 1 : Over-excitation of the brake
• After excitation time t 1 the voltage is reduced to
U 3 =0.45 U 1 : Non-release voltage of the brake
(V AC)
Output voltage
(V DC)
Ambient
temperature
Article No.: U 1 at 50/60 Hz U 2 U 3 °C
PMG 480 215 … 500 0.9 U 1 0.45 U 1 –15 … +80
1/92 Siemens D 81.1 · 06/2020