Installation and Operational Instructions for
ROBA-stop
®
-S brake Type 856. _ _ _ . _
Size 11
(B.8.3.1.GB)
19/11/2010 TK/KE/GC/SU
Chr. Mayr GmbH + Co. KG
Tel.: 08341 / 804-0
Eichenstraße 1
Fax: 08341 / 804-421
D-87665 Mauerstetten
http://www.mayr.de
Page 11 of 13
Germany
E-Mail:
Release Monitoring (Fig. 12)
The release monitoring device emits a signal on brake release,
which means the switch is actuated with:
energised coil (electromagnetic release)
emergency release actuation
From the point at which the brake is energised, a time span of
three times the separation time must pass before the
microswitch signal on the release monitoring is evaluated.
The microswitch (27) is adjusted manufacturer-
side.
If re-adjustment is necessary (no signal change
for energised / de-energised condition, or on
actuating the emergency hand release), it can
be carried out directly from the terminal box.
Microswitch Adjustment
The microswitch is located in the terminal box integrated in the
housing (3), under the terminal block (rectifier). Microswitch (27)
adjustment is carried out on a de-energised coil.
The air gap must correspond to the nominal air gap
0,45
+0,35
mm.
Procedural Method for Adjustment:
1. Check the air gap between the coil carrier (2) and the
armature disk (5).
2. Screw off the terminal box cover (24).
3. Loosen the fixing screws of the microswitch (27) holding
bracket slightly.
4. Change the microswitch position axially (using a screwdriver).
Here, please observe the following:
a) Feeler gauge "X" = 0,15 mm: Microswitch must not switch
(contact brown-blue opened).
b) Feeler gauge "X" = 0,25 mm: Microswitch must switch
(contact brown-blue closed).
5. Tighten the fixing screws of the microswitch (27) holding
bracket.
6. Attach the terminal block (rectifier).
7. Screw the terminal box cover (24) back on.
Fig. 12
If the air gap between the coil carrier (2) and
the armature disk (5) is larger than the nominal
value due to rotor (4) wear, this increased value
must be taken into consideration when
adjusting the microswitch.
Example:
Air gap = 0,75 mm
Determined air gap
0,75 mm
Nominal air gap
- 0,45 mm
Wear
= 0,30 mm
Adjustment for
Switching:
Not switching:
Wear
0,30 mm
Wear
0,30 mm
Limit
+ 0,25 mm
Limit
+ 0,15 mm
Feeler gauge (X) = 0,55 mm
Feeler gauge (X) = 0,45 mm
Microswitch Specifications
Characteristic values for
measurement:
250 V~ / 3 A
Minimum switching capacity: 12 V, 10 mA DC-12
Recommended switching
capacity:
for maximum lifetime
and reliability
24 V, 10...50 mA
DC-12
DC-13 with free-wheeling
diode!
Usage category acc. IEC 60947-5-1:
DC-12 (resistance load), DC-13 (inductive load)
Microswitches cannot be guaranteed fail-safe.
Therefore, please ensure appropriate access for
replacement or adjustment.
The switching contacts are designed so that they
can be used for both small switching capacities
and medium ones. However, after switching a medium
switching capacity, small switching capacities are no longer
reliably possible. In order to switch inductive, capacitative and
non-linear loads, please use the appropriate protective circuit to
protect against electric arcs and unpermitted loads!
5
0,45
+0,35
27
24
2
Y
X
Detail Y
Nominal
air gap