Operating manual
Brakes for Asynchronous Motors / Asynchronous Motors IE2
1
07/2014
WE KEEP THINGS MOVING
ID 442015_en.04
en
This operating instructions is a supplement to the operating
instructions "System Motors / Asynchronous Motors".
The electromagnetically operated, twin-surface spring
pressure brake is applied by spring force when not energised
and is released by an electromagnetic DC coil (Fig. 1, pos. 2)
or, when stationary, by an optionally installed manual valve
(Fig 1, pos. 3). The DC coil can be supplied either directly with
direct current or with an alternating current via a brake
rectifier (bridge, single-phase or Powerbox, see information
on the specification plate). When a direct DC supply is
provided (without a rectifier), a varistor must be installed as
protection against switching surges.Observe the information
in the STÖBER catalogue, on the braked motor specification
plate, in the operating instructions, wiring diagrams and
safety instructions.
If in doubt or when documents are lacking, obtain the
necessary information from the pertaining STÖBER sales
office or service workshops.
1
Technical data
Technical data for brake see appendix.
1.1 Electrical features Powerbox
1.2 Current and torque-time diagram in
dependency on the circuit
arrangement
It is appropriate to switch on the brakes by the respective
switch-on time t2 before the motor.
See also Item 3, Electrical connection.
1.3 Formula brake
M
B
[Nm] - Braking torque
P
20
[W] - Power input in continuous operation at 20° C
W
NR
[10
6
·J] - Friction work until next adjustment,
amplification factor for Powerbox see below!
(W
NR
=10·W
01
·(L
max
-L
N
))
W
01
[10
6
·J] - Friction work per 0.1 mm of wear
L
N
[mm] - Rated air gap
L
max
[mm] - Maximum air gap
g
min
[mm] - Min. permissible lining thickness
t
2
[ms] - Switch-on time (brake release time) up to M = 0 Nm
t
11 DC
[ms] - Switch-off time (delay) at S DC
t
11 AC
[ms] - Switch-off time (delay) at S AC
J
B
[10
-4
kgm
2
] - Mass moment of inertia
U
DC
[V
DC
] - Brake voltage
U
AC
[V] - Brake rectifier voltage
t
2P
[ms] - Powerbox switch-on time (brake release time) up to
M = 0 Nm
t
11DCP
[ms] - (delay) at S DC with Powerbox
t
11ACP
[ms] - (delay) at S AC with Powerbox
W
NRP
/W
NR
- Friction work until next adjustment, Powerbox
(amplification factor)
I
B
- Brake current
Z
S
[1/min] - Permitted switching cycles per minute (a
switching cycle consists of switching on and off once)
2
Installation, adjustment /
readjustment of the air gap (Fig. 1)
WARNING!
For work on the brake:
X
Secure machine against unintentional movement
(vertical load, etc.).
The brakes are installed on the drive upon delivery and the
braking torque and air gap are adjusted to their rated values.
Air gap setting:
Adjust the air gap
“L”
to the rated value (L
N
) when the
maximum air gap (L
max
) is reached due to wear:
- Remove fan guard (1).
Powerbox electrical properties
Powerbox for use
with
Frame size 63 - 132: Terminal box or
switch cabinet;
Size 160 - 225: only in switch cabinet
Input voltage
180 - 300 V
AC
+/- 0%
can be used for a wide range
220 - 275 V +/- 5% 50 or 60 Hz
Excitation time
350 ms +/- 10%
Cable length
max. 100 m of brake coil
Current
I
N
45°C
1,2 A stable;
2,4 A for 350 ms
Current
I
N
75°C
0,7 A stable;
1,4 A for 350 ms
