Siemens Simovert Masterdrives Compendium page 266

09.2008
4. Checking the
direction of
rotation
5. Normal operation
NOTE
NOTE
about removing the
encoder on
SIEMENS motors
DANGER
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES
Not only the angular position but also the direction of rotation of the
encoder can be checked:
If the position test is performed during operation, the current pointer can
be turned with bit 11 in control word 1 "enable positive direction of
rotation" (see function diagram 180, P571 "Q.positive DR").
If the bit is switched from 0 to 1, the injected current pointer slowly turns
to the right by one "electrical revolution" (approx. 1 to 2 s). This turns
the motor one pole division to the right. Connector KK0186
("theta(I cont.)" function diagram 390) then turns one full revolution in
the positive direction (0 % > 100 % > +199 % / −200 % > −100 % >
0 %). (If the bit is switched from 1 to 0, the procedure is reversed.)
If KK0186 does not turn a full revolution, either the parameterized
number of pole pairs (P109) is incorrect (how far did the motor turn
mechanically, does it correspond to the pole pair number?) or has the
encoder been incorrectly parameterized (incorrect number of
increments?).
If KK0186 completes a full revolution during the test but in the opposite
direction, either a track has been reversed on the encoder or two
phases have been reversed on the motor (→ correct on motor or on
encoder and repeat point 3 "encoder adjustment").
Do not forget to reset parameters P115, P260 or the binector at P549
so that normal current-controlled operation can continue!
If an encoder or multiturn encoder is to be completely removed, a screw
is required to force off the encoder! The encoder has a conical shaft
end that is inserted into the motor shaft. Even after all fixing screws
have been removed, the encoder shaft is usually fixed so tight in the
motor shaft that the encoder can only be removed without damaging it
by forcing it out with a special screw.
Depending on the design of the encoder shaft, different screws will be
required for forcing off the encoder (see Fig. 7-13 and Fig. 7-14).
If the encoder is adjusted incorrectly, the motor can overspeed.
Compendium Motion Control
Functions
7-57