Replacing A Motor Or Encoder - Siemens SINUMERIK 840D sl Function Manual

05.08
9.6

Replacing a motor or encoder

Warning
!
After hardware and/or software components have been changed or replaced, it is
only permissible to boot the system and activate the drives when the protective
devices are closed. Personnel shall not be present within the danger zone.
Depending on the change or replacement, it may be necessary to carry out a new,
partial or complete acceptance test (see Chapter 9.5 Acceptance test).
Before persons may re–enter the hazardous area, the drives should be tested to
ensure that they exhibit stable behavior by briefly moving them in both the plus
and minus directions (+/–).
It is especially important to carefully observe this for high–dynamic linear and
torque motors.
Warning
!
After the measuring system has been replaced – regardless of whether it is a
direct or an indirect system – the relevant axis must be re–calibrated.
Description
The following information essentially refers to replacing a motor encoder. The limi-
tations that apply as well as the procedures are essentially the same when replac-
ing a direct measuring system.
When service is required (motor defective or encoder defective), it might be neces-
sary to completely replace the motor or just the motor encoder.
In this case, the motor encoder must be re–calibrated. This influences the behavior
of Safety Integrated if the functionality "safe limit positions" or "safe cams" have
been activated for the axis in question, i.e. the axis has the status "safely refer-
enced". Depending on which motor measuring system is used, it might be neces-
sary to select a different procedure.
The procedure for replacing a motor with absolute value encoder and to replace a
motor with incremental encoder are described in the following text. The end of the
Chapter discusses 2–encoder systems and encoder modules.
Limitations
As mentioned above, the functionality "safe limit positions" or "safe cams" is active
for the axis in question.
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
Commissioning
9.6 Replacing a motor or encoder
9-427