6. Electrical installation
Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH
115
called “environments”. The “first” environment includes electricity grids connected to
residential housing. The “second” environment includes grids connected only to industrial
plants.
Without filter measures, the following applies to stepping motor controller CMMS-ST:
EMC class
Area
Compliance with EMC requirements
Interference
emission
Second environment (industrial)
Motor cable length up to 25 m
Interference
immunity
Second environment (industrial)
Regardless of motor cable length
Table
6.18 EMC requirements: Second environment
6.5.4
EMC-compliant wiring
The following must be observed for EMC-compliant installation of the drive system (see
also Chapter
6 Electrical installation, Page 101):
1.
In order to minimise current leakage and losses in the motor connection cable, the
CMMS-ST stepping motor controller should be installed as close as possible to the
motor (see also Chapter
6.5.5 Operation with long motor cables, Page 115 below).
2.
The motor and angle encoder cables must be screened.
3.
The screen of the motor cable is fitted to the housing of the CMMS-ST stepping motor
controller (screen connection terminals). The cable screen is also always fitted to the
corresponding stepping motor controller to prevent leaked current flowing back to the
controller which caused it.
4.
Signal lines must be separated as far as possible from the power cables. They should
not be routed parallel to one another. If crossovers cannot be avoided, they should be
made as close to vertical (i.e. at a 90° angle) as possible.
5.
Unscreened signal and control lines should not be used. If they must be used, they
should at least be twisted.
6.
Even screened lines always have short unscreened parts at either end (unless a
screened plug housing is used).
In general: -
Connect the inner screens to the pins of the plug connector provided for
the purpose; length max. 40 mm.
-
Max. length of unscreened wires: 35 mm.
-
Connect total shield flat at the motor to the plug or motor housing;
length max. 40 mm.
6.5.5
Operation with long motor cables
For applications with long motor cables and/or if the wrong motor cables are selected
with excessive cable capacity, the filters may be subjected to thermal overload. In order to
avoid such problems, we recommend the following procedure for applications in which
long motor cables are required:
