BEI Sensors MHK5 Absolute Hollow Shaft Encoder - Manual (Page 8)

2.5 Connecting the screen
To achieve the highest possible noise immunity
shielded cables should be used for data
transmission. The shield should be connected to
ground on both ends of the cable. In certain cases, a compensation current might flow over the shield.
Therefore a potential compensation cable is
recommended.
2.6 Instructions for mechanical installation and electrical connection of the angular encoder
The following points should be observed:

Do not drop the angular encoder or subject it
to excessive vibration. The encoder is a
precision device.

Do not open the angular encoder housing
(this does not mean that you cannot remove
the connection cap). If the device is opened
and closed again, it can be damaged and dirt
may enter the unit.
 The angular encoder shaft must be
connected to the shaft to be measured
through a suitable coupling (full shaft
version). This coupling is used to dampen
vibrations and imbalance on the encoder
shaft and to avoid inadmissible high forces.
Suitable couplings are available.
 Although absolute encoders are rugged,
when used in tough ambient conditions, they
should be protected against damage using
suitable protective measures. The encoder
should not be used as handles or steps.
 Only qualified personnel may commission
and operate these devices. These are
personnel who are authorized to commission,
ground and tag devices, systems and circuits
according to the current state of safety
technology.

It is not permissible to make any electrical
changes to the encoder.

Route the connecting cable to the angular
encoder at a considerable distance or
completely separated from power cables with
their associated noise. Completely shielded
cables must be used for reliable data transfer
and good grounding must be provided.
 Cabling, establishing and interrupting
electrical connections may only be carried-out
when the equipment is in a no-voltage
condition. Short-circuits, voltage spikes etc.
can result in erroneous functions and
uncontrolled statuses which can even include
severe personnel injury and material damage.

Before powering-up the system, check all of
the electrical connections. Connections,
which are not correct, can cause the system
to function incorrectly. Fault connections can
result in severe personnel injury and material
damage.
Page 8 BEI Sensors Profibus Manual serie M Revision 03/10