SIEMENS
11/27
Siemens MD 50.1 · 2015
Motor options
Mounted components
Brake
11
■
Brake options
(continued)
Monitoring
Brake with microswitch to monitor the release
The air gap
s
gap
of the brake is monitored by a microswitch,
which can be mounted on the base plate of the solenoid.
The motor does not start up until the brake has been fully
released (
s
gap
= 0) and the armature disk is in contact with the
solenoid. The microswitch is actuated and controls the motor
contactor.
When the brake is switched off, the armature disk reaches the
maximum air gap (
s
gapmax
) and the microswitch opens.
This means that the motor contactor is not controlled and the
motor does not start.
This method is used for machines and units which require a
precisely defined starting and braking procedures, as well as
for fault monitoring of faulty rectifiers, interrupted connecting
cables, faulty solenoids, and excessively large air gaps
(brake solenoid cannot fully attract the armature disk).
The microswitch for air gap monitoring is available for brakes in
sizes L32 to L400 and FDX30 and FDX40.
For brakes in sizes L32 to L400, this option cannot be combined
with option "Increased corrosion protection" (
C10
).
Fig. 11/32
Circuit principle with microswitch
Order code:
Microswitch for monitoring brake release
C04
G_D087_XX_00033
–
L1
N
L2
L3
© Siemens AG 2015