Stober K38-03 Operating Manual

Operating manual
Brakes for Asynchronous Motors / Asynchronous Motors IE2
This operating instructions is a supplement to the operating
instructions "System Motors / Asynchronous Motors".
The electromagnetically operated, twin-surface
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
Powerbox electrical properties
Powerbox for use Frame size 63 - 132: Terminal box or
with switch cabinet;
Size 160 - 225: only in switch cabinet
Input voltage 180 - 300 V
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 45°C
N
Current I 75°C
N
07/2014
spring
+/- 0%
AC
1,2 A stable;
2,4 A for 350 ms
0,7 A stable;
1,4 A for 350 ms
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 [Nm] - Braking torque
B
P [W] - Power input in continuous operation at 20° C
20
6
W [10 ·J] - Friction work until next adjustment,
NR
amplification factor for
(W =10·W ·(L -L ))
NR 01 max N
6
W [10 ·J] - Friction work per 0.1 mm of wear
01
L [mm] - Rated air gap
N
L [mm] - Maximum air gap
max
g [mm] - Min. permissible lining thickness
min
t [ms] - Switch-on time (brake release time) up to M = 0 Nm
2
t [ms] - Switch-off time (delay) at S DC
11 DC
t [ms] - Switch-off time (delay) at S AC
11 AC
-4 2
J [10 kgm ] - Mass moment of inertia
B
U [V ] - Brake voltage
DC DC
U [V] - Brake rectifier voltage
AC
t [ms] - Powerbox switch-on time (brake release time) up to
2P
M = 0 Nm
t [ms] - (delay) at S DC with Powerbox
11DCP
t [ms] - (delay) at S AC with Powerbox
11ACP
W /W - Friction work until next adjustment, Powerbox
NRP NR
(amplification factor)
I - Brake current
B
Z [1/min] - Permitted switching cycles per minute (a
S
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:
Secure machine against
(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
maximum air gap (L ) is reached due to wear:
max
- Remove fan guard (1).
1
Powerbox see below!
unintentional movement
) when the
N
ID 442015_en.04