BBH SCU Series, Installation Manual

Page: 56 / 303

7
Connection and installation
HB-37500-810-11-16F-EN SCU Installation Manual - Master and Slaves - SARC Page 56 of 303
Status: 09.06.2022
7.9. Connection of position and speed sensors
7.9.1. General information
Depending on module type the device has external encoder interfaces for the
connection of industrial incremental and absolute encoders. The encoder interfaces can
be configured as incremental, SIN/COS, or as absolute SSI-encoders.
It is also possible to connect 2 incremental signal generating sensors (e.g. proximity
switches) to the counting inputs of the SDU module. The signals must each be read in
with normal and complementary track.
IMPORTANT:
The voltage supply of the encoder system uses the dedicated terminals on the slave
module. This voltage is applied to the encoder plug and monitored by an internal
diagnostic process.
When the sensor is supplied with an external voltage, this voltage must be supplied
through the encoder plug. The corresponding terminal (encoder supply voltage) on the
slave module remains unoccupied.
If an external sensor voltage supply is not recirculated through the encoder plug, any
failure of this supply must be included in the fault examination of the overall system.
This, in particular, requires evidence that this fault is detected or can be excluded when
the specified operating voltage of the overall system is fallen short of / exceeded.
EMC - measures such as shielding etc. must be observed.
The two encoders must be non-interacting to each other. This applies for both the
electrical as well as the mechanical part.
If both encoders are coupled to the facility to be monitored via common mechanical
parts, the connection must be positively designed and should not have any parts that
are susceptible to wear (chains, toothed belts, etc.). Should this be the case, additional
monitoring features for the mechanical connection of the sensors (e.g. monitoring of a
toothed belt) are required). In case of an active position processing at least one
absolute value encoder must be used.
When using two equivalent sensors one must make sure that the sensor with the higher
resolution is configured as sensor 1 (process sensor) and the sensor with the lower
resolution as sensor 2 (reference sensor).