6 Assi
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Parameters to the Control and the PLC Pro
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6.10 Linear motors (1FN1 and 1FN3 motors)
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 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
6.10.3 Start-up: Linear motors with 2 identical primary parts
If it is certain that the EMFs of both motors have the same phase relation, then
the motors can be operated on one drive if they have paralleled connecting
cables.
The start-up procedure for paralleled linear motors is based on the start-up op-
eration for a single linear motor.
Initially only one linear motor (motor 1) is connected to the drive and started up
as a single motor (1FNx...). The commutation angle offset is automatically cal-
culated and noted during this phase.
Motor 2 is then connected in place of motor 1 and operated as a single motor.
The commutation angle offset for this motor is also calculated automatically and
noted.
If the difference between the commutation angle offsets of motors 1 and 2 is
less than 10 degrees electrical, both motors can be connected in parallel to the
drive and started up as a parallel connection of 2 linear motors (e.g. 2x 1FN. ...).
The start-up sequence for paralleled linear motors is as follows:
1. Disconnect the paralleled motors
Connect motor 1 only to the power section.
2. Start up motor 1 as if it were a single motor
––> Note information in Section 6.10.1
––> Start up the linear motor as described in Section 6.10.2
(up to and including point 7.)
––> Check and set rotor position identification
(see Section 6.10.2, point 8.)
3. Traverse axis and perform function check
4. Note commutation angle offset of motor 1
– MD 1016 (motor 1) = _ _ _ _ _ _ _ _ degrees electrical
5. Switch off and wait until DC link has discharged
6. Connect motor 2 to the power section instead of motor 1
Caution:
In the case of a Janus configuration (see Section 6.10.7), interchange
phases U and V.
7. Switch on motor with pulse and controller enabling signals inhibited
General
Procedure for
starting up
paralleled linear
motors
04.00
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