2.7 Disposal
Always dispose of unusable or irreparable devices in accordance with the
applicable specific national waste disposal regulations.
NOTE
We will be glad to assist you in the disposal of these devices. Please contact
us.
3
Product description
Type SKS/SKM encoders are motor feedback systems predestined for the
dynamic and precise operation of servo-control circuits, due to their equipment.
The overall system, consisting of encoder, evaluation system, servo inverter and
motor, forms a control circuit. Actual values for commutation, rotational speed,
direction of rotation and position are derived from the encoder signals.
Encoder systems of the SKS/SKM series are suitable for use in function chains of
safety-related machine functions.
The sensor signals are transferred to the evaluation system via HIPERFACE® inter‐
face. In combination with a drive system of category 3 (EN ISO 13849), SILCL2
(EN 62061) or PL d (EN ISO 13849), the motor feedback system is suitable for
safety applications. If only the analog incremental signal outputs (sine/cosine) are
used for speed-based safety functions of the drive, the motor feedback system
meets the requirements in EN 61800-5-2.
The safe motor feedback system does not support any safety-related operating
modes in the context of an absolute position.
4
Assembly
WARNING
Observe the following for assembly of the SKS36S/SKM36S safe motor feed‐
back system.
•
Switch off the power of all affected machines/units during the assembly
process.
•
Make sure to avoid any blows or impact to the shaft under all circumstances,
to prevent damage to the ball bearings.
•
Use suitable flexible shaft couplings for stand alone encoders. The suitability
of the coupling depends on the occurring angle and shaft offset, accelera‐
tion, temperature, speed and bearing load permitted for the motor feedback
system, as stipulated by the motor feedback system datasheet.
•
For SKS36S/SKM36S encoders with tapered shaft the shaft end of the
motor may only have a diameter of 12 mm max.
4.1 Preparation for mounting
Degrease the drive shaft and the shaft of the motor feedback system.
4.1.1
Tools/Parts Required
SKS36S/SKM36S STANDALONE
Mounting using the threaded flange holes requires M4 screws.
Their length and screw head type depend on the installation conditions. Fixing via
the servo groove requires servo clamps and M3 screws; select the screw length
according to the mounting conditions.
SKS36S/SKM36S with tapered shaft
The assembly tool BEF-MWSKX36 (Part No. 2031079) is required for mounting or
removal.
4.1.2
Generally Applicable Notes
Using the torque support for the motor feedback system, the housing must be cor‐
rectly seated in the customer's flange arrangement.
The more precise the centering for the motor feedback system, the less the angle
and shaft offset during assembly and the less load on the bearings of the motor
feedback system.
EMC considerations make it mandatory to connect the housing and/or the
encoder to earth. For the SKS36S/SKM36S with tapered shaft, this is provided by
the torque support.
For standalone motor feedback systems with a connector exit, the connector
housing is connected to the device housing so as to be electrically conductive
while, for devices with outgoing cable, the screening and the woven screen, resp.,
will be connected to the device housing.
EMC considerations make it mandatory to connect the device housing and the
cable screen, resp., to earth.
This may be effected via the housing of the mating connector and by connecting
the braided screen of the cable, resp. The braided screen should be connected
over a large area.
WARNING
Shielding connection
To ensure trouble-free operation, it is imperative to ensure a clean shield con‐
nection on both sides.
4.2 Assembling the motor feedback system with conical shaft and spring plate
support (fig. 5)
b
Block customer's drive shaft to prevent rotation.
b
The hexagonal part (1) of the encoder shaft (2) must be engaged in the
recess of the fixing plate (3) of the torque support (4). Place the assembly
tool (5) on the back of the encoder and engage in the recesses of the
encoder housing (6). Using the hexagonal part (7) of the assembly tool (5),
screw the encoder into the drive shaft. Screws (8) must not hook into the fix‐
ing holes of the motor.
Tightening torque: 4 Nm + 0.8 Nm.
WARNING
Observe the tightening torque!
Compliance with the tightening torque attains an oversizing of the fric‐
tion-lock shaft connection that justifies the supposition of fault exclu‐
sion in regard of a "break in the motor/encoder shaft connection".
WARNING
Make sure that assembly work is only performed and documented by
appropriately instructed and trained personnel.
b
Release the drive shaft and rotate the encoder until the holes in the fixing
plate (3) are positioned over the fixing holes of the motor flange. Alternately
tighten the fixing plate (3) with 2 M3 screws (8) on the motor flange. This
releases the encoder shaft.
Tightening torque: 0.8 Nm ± 0.08 Nm.
NOTICE
•
The internal thread in the motor shaft must be free of burrs and dirt.
•
The taper must be free of dirt and grease.
•
Max. torque for the thread, before the taper is seated: 0.8 Nm.
Dismantling:
b
Block customer's drive shaft to prevent rotation.
b
Open the cover (12) using a screwdriver if necessary (Fig. A). Remove the
connector fitted with the set of strands (9+10) volt-free
b
Remove the 2 M3 screws (8). The fixing plate (3) is to be positioned in such
a way that the screw holes are aligned with the torque support (4). Turn the
encoder by hand until fixing plate (3) engages. Place the assembly tool (5)
on the back of the encoder and engage in the recesses of the encoder hous‐
ing (6). Using the hexagonal part (7) of the assembly tool (5), detach and
remove the encoder from drive shaft.
4.3 Mounting of Motor Feedback System with Servo-/Face Mount Flange
(STANDALONE)
WARNING
For stand-alone variants, the coupling of the encoder shaft to the motor shaft
must be friction-locking. For a friction-lock coupling, proof from the motor
manufacturer of sufficient oversizing in regard of fault exclusion as per IEC
61800-5-2 must be provided.
4.3.1
Assembly with mounting plate (Fig. 6)
b
Block customer's drive shaft to prevent rotation.
b
Mount coupling (5) on the encoder (1). Ensure that it does not brush against
the encoder flange.
b
Fit the encoder with 3 M4 screws (3), e.g. on the mounting plate (2). Push
encoder (1) with mounted coupling (5) and mounting plate (2) onto drive
shaft and centering/clamping neck. Then fix the encoder (1) via 4 screws
(4). Use a liquid threadlocker (such as LOCTITE 243) to prevent the screws
(4) from coming loose. Fix coupling (5) onto the drive shaft.
Dismantling:
b
Block customer's drive shaft to prevent rotation.
b
Undo electrical connection volt-free.
b
Loosen coupling (5) on the drive shaft. Undo the 4 screws (4) and remove
the encoder. Remove the fixing plate (2) by undoing the 3 screws (3) and
also remove the coupling (5) from the encoder.
4.3.2
Assembly with servo clamps (Fig. 7)
b
Block customer's drive shaft to prevent rotation.
b
Mount coupling (2) on the encoder (1). Ensure that it does not brush against
the encoder flange. Push encoder (1) with mounted coupling (2) onto the
drive shaft and centering neck.
b
Mount servo clamps (3) with M3 screws (4). Tighten screws (4) only lightly
such that the encoder (1) can still be rotated.
b
Determine the connector position by rotating the housing.
b
Use a liquid threadlocker (such as LOCTITE 243) to prevent the screws (4)
from coming loose. Fix coupling (2) onto the drive shaft.
Dismantling:
b
Block customer's drive shaft to prevent rotation.
b
Undo electrical connection volt-free.
b
Remove servo clamps (3) by undoing the screws (4). Loosen coupling (2) on
the drive shaft and detach centering neck. Remove encoder (1).
5
Electrical installation
WARNING
Observe the following for assembly of the SKS36S/SKM36S safe motor feed‐
back system.
•
To connect the sensors, refer to the corresponding operating instructions for
the external drive system or for the higher-order control system.
•
Never establish or remove electrical connections to the motor feedback sys‐
tem with the power connected, since that could result in a faulty device.
5.1 Connection
Version with in-line plug (Fig. 1)
b
Open the cover (12) using a screwdriver if necessary (Fig. A). Engage the
connector (9) fitted with the set of strands(10), volt-free, in the connector
socket (11) of the encoder.
b
Close the cover (engage in the recess of the encoder housing (6)).
b
The engagement by clicking must be clearly felt or heard.
8014124/10RG/2018-08-20/de, en, es, fr, it
SKS36S/SKM36S, SKS36S Stand-Alone, SKM36S Stand-Alone | SICK
6
