DC motor - Siemens, s.r.o.

Installation and Assembly
are transmitted virtually completely (rigid, unpressed wire end ferrules would
reduce the clamping forces acting on the conductor and hence endanger the
contact quality).
[ID 531]
3.5.5 Connecting auxiliary circuits
Auxiliary circuit, general
Brush monitoring
Tacho-generator
Terminal strips for conductor cross-sections of up to 2.5 mm 2 are installed for
connecting the auxiliary circuits, such as temperature sensors or standstill heating.
The information required to connect the auxiliary circuits is provided in the
connection diagram, located on the inside of the terminal box cover, and in the
motor documentation.
Note
The required insulation stripping length on conductors for auxiliary terminals differs
according to terminal type (6 to 9 mm). When the length is correct, the bare
conductor should reach to the central stop in the terminal and at the same time the
conductor insulation should be run up to the contact part of the terminal.
Depending on the design of the motor, signal transmitters may be installed for
brush monitoring.
The brush monitoring facility serves the purpose of detecting the limit value of the
brush height. When a brush height of approximately 2 mm above the prescribed
minimum brush height is reached, a signal is generated via a microswitch. In
normal operation and at average speeds, this corresponds to a remaining running
time of between 500 and 1000 operating hours. The carbon brushes must be
replaced in good time.
The electrical connection conditions are shown in the terminal diagram in the
terminal box.
With built-on tacho-generators the electrical connection is on the line-side; the
supplementary operating instructions must be observed.
Temperature monitoring
Caution
In the case of motors with temperature sensors, their temperature evaluation and
control system must be designed in such a way that danger from unexpected
automatic restarting of the installation is ruled out following response of the
temperature protection and subsequent cooling.
SIEMENS AG T61160347010001 (DMHO V9)
Operating instructions 1GG6286-0NA4.-1VV1-Z 3-13