26 EM-ABS-01 for ACU 03/12
5.3.3 Power supply
Encoder power supply can be effected in different ways. Dependin
on the consumers
connected, there are different encoder power supply possibilities or requirements.
Generally, there are three different application types:
• Low power demand (< 0.5 W) and power supply ≤ 12 V:
Î Internal power supply.
• Medium power demand (0.5... 2 W) and power supply ≤ 12 V:
Î Power supply to be looped via X410.
• High power demand (> 2 W) or power supply > 12 V:
Î Connect encoder directly to external power supply.
Encoders with high power demand (> 2 W) or voltage higher than DC 12 V must be
connected to an external power supply directly.
External power supply can be connected via terminals X410A for encoder supply. In
this case, a DC 24 V supply can be controlled down, by the EM-ABS-01 module, to the
frequently needed voltage levels DC 5…12 V.
5.3.3.1 Internal power supply
Encoders with a low power consumption (< 0.5 W) can be supplied, in most cases, by
the internal power supply unit.
Set parameter Power supply 1186 to either “1 - internal” or “5- internal, sense”. See
chapter 8.4.3 “Power supply”.
The voltage level can be
set up via parameter
Supply voltage 1187. See chapter
8.4.4 “Supply voltage”.
The encoder can be powered as follows:
− via control terminals X410A.5 (DC 5 … 12 V) and X410A.7 (GND) or
− via contacts X412.6 (VEnc) and X412.15 (GND) of the female HD-Sub-D connec-
tor.
See chapter 5.3.2 "Control terminals".
Caution! If power supply is done via the internal power supply of the encoders, a
total power of 2 W is available for all consumers connected to digital, ana-
log and encoder interfaces. This includes all interfaces of the ACU basic
device and the EM-ABS-01 module together.
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