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(Rotational) speed information and commuting information in AC synchro‐
nous motors
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(Rotational) speed information in asynchronous motors
The safe motor feedback system can be used in conjunction with a drive system
in accordance with IEC 61800-5-2, in safety applications up to category 3 and PL
d in accordance with EN ISO 13849 or SILCL2 in accordance with EN 62061.
It fulfills the requirements of the Machinery Directive 2006/42/EC and provides
support for the drive system in ensuring:
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the safety functions, based on the safe position or speed information of the
motor feedback system
•
In the case of safety functions that are based on the safe absolute position,
the motor feedback system only supplies one channel without safety-related
diagnostics upon being switched on. A second channel must be imple‐
mented by the user using other measures. This second channel can be pro‐
vided by the user by saving the position of the motor feedback system before
switching it off and comparing it to the starting position of the motor feed‐
back system when switching it on the next time. Use for absolute position
safety-related purposes is possible only if the values match. Otherwise, a ref‐
erence run must be carried out by the user. Without a second channel, a ref‐
erence run must be carried out each time the motor feedback system is
switched on to confirm the absolute position.
The motor feedback system is not able to create a safe state for the drive system
independently. The drive system has to create the safe state as a response to an
error displayed by the motor feedback system.
The sensor signals are transferred to the evaluation system via a HIPERFACE
interface. 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 suit‐
able for safety applications. If only the analog incremental signal outputs (sine/
cosine) are used for speed-based safety functions of the drive, the motor feed‐
back 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.
WARNING
The safe motor feedback system may be used only within the limits of the
prescribed and specified technical data, dimensions and tolerances of the
dimensional drawings and operating conditions, and the specified tightening
torques must be complied with.
It is especially important that the motor feedback system not be used for
safety applications beyond its mission time and bearing service life (see tech‐
nical data). After its bearing service life is exceeded, bearing wear or fatigue
could lead to bearing failure. To prevent this, the motor feedback system
must be taken out of operation no later than when the bearing service life
has been reached.
The bearing service life is also influenced by the specific application, in par‐
ticular due to operating modes with low speeds, reversing operation and
mechanical vibrations.
Current should be prevented from passing through the ball bearing (e.g. due
to injected currents).
If used in any other way or if alterations are made to the device – including in
the context of mounting and installation – this will render void any warranty
claims directed to SICK STEGMANN GmbH.
2.3 Improper use
Double-elastic mounting (to the stator and shaft coupling) of the motor feedback
system is prohibited. The shaft connection between the drive system and the
motor feedback system must have a rigid design.
The motor feedback system cannot support safety functions that are based on
the absolute position, which is transmitted to the RS 485 parameter channel,
without additional measures.
Together with its spring plate stator coupling, the motor feedback system makes
up a spring-mass-system which has its own resonance frequency. If torsion stimu‐
lation is introduced into the system via the motor shaft near this frequency, the
specified limits for vibration resistance can quickly be exceeded; in addition, the
specified accuracy of the position value may also be violated under such loads.
If such stimulations cannot be reliably ruled out in the application, suitable tests
must be carried out for the entire drive system.
2.4 Requirements for the qualification of personnel
The SFS60S-HRZT0S01 safe motor feedback system may be mounted, put into
operation, checked, maintained, or used only by qualified safety personnel.
A qualified person
•
has taken part in adequate technical training and
•
has been instructed by a machine operator in machine operation and the
applicable safety guidelines and
•
can access these operating instructions.
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Project planning
WARNING
The supply voltage must be generated from PELV systems (EN 50178). The
motor feedback system conforms to protection class III in accordance with EN
61140. If the supply voltage is not generated from PELV systems, the user
must take other measures to ensure safe disconnection for live parts.
8024039/2019-02-01/de, en, es, fr, it
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Mounting
This chapter describes the mounting of the safe motor feedback system.
4.1 Safety
NOTE
Depending on the motor design, it may be necessary to perform the electrical
installation before the mechanical mounting.
NOTE
If the safe motor feedback system has to be removed, the mounting steps are
to be carried out in reverse order.
NOTE
No impacts or shocks are permitted during the mounting of the motor feed‐
back system.
NOTE
The drive unit must be connected to the hollow shaft motor feedback system
using a positive or a positive and non-positive connection.
Using a feather key will prevent the motor feedback system from being
twisted radially. A feather key must be used for drive shafts with a diameter of
8 mm and 3/8".
This ensures that the over-dimensioning required to rule out errors caused by
the loss of the shaft connection.
®
NOTE
For variants with a spring plate stator coupling, it may not be possible to hold
the torque wrench perpendicular to the screw. An angle of inclination of up to
20° is included in the tightening torque tolerance. Loosening and fixing the
screw at an angle on a regular basis can cause damage to the screw.
WARNING
Note the following safety notes for screws used during mounting:
•
Minimum strength class of 8.8
•
Select the screw length type according to the mounting conditions
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Secure screw connections from loosening using screw adhesive
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Spring washers and toothed washers are not sufficient for securing
screws!
WARNING
Only use the screws once. After removing the motor feedback system:
Clean the residue off of the affected threads on the drive shaft.
b
Use a new (unused) screw with screw adhesive on the thread during the
b
remounting process.
If the Torx screw (4) is lost, another must be purchased from SICK.
b
4.2 Mounting a motor feedback system with spring plate stator coupling
Fig. 1: Mounting a through hollow shaft
Mount on the drive shaft (2) provided by the customer with supplied feather
b
key (1).
Block the customer's drive shaft (2).
b
Apply screw adhesive to the thread of the clamping ring (3) or the supplied
b
Torx screw (4).
Insert the Torx screw (4) in the clamping ring (3) and secure it loosely; do not
b
tighten it at this stage.
Push the motor feedback system onto the customer drive shaft (2), aligning
b
it with the feather key (1). Ensure that you take the distance between the
spring plate stator coupling (5) and the mounting surface (6) into account
when it comes to the length of the screws (4).
Secure the screws (7) and the washers (8) loosely and apply screw adhesive
b
to each thread at the same time.
Fasten the screws (7) until the motor feedback system can be fully pushed
b
on and the spring plate stator coupling (5) is resting against the mounting
surface (6).
Tighten the screws (7). Tightening torque: 1.2 ± 0.1 Nm.
b
Tighten Torx screw (4). Tightening torque: 3.5 ± 0.1 Nm.
b
SFS60S/SFM60S | SICK
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