Encoder Power Supply - Siemens SIMODRIVE 611 Planning Manual

05.01
3.4.2

Encoder power supply

Remote/sense operation is possible with the encoder power supply for the mo-
tor measuring systems and the encoder power supplies for the measuring sy-
stems for direct position sensing, with the exception of the standard 1 Digital
drive controls (the voltage is directly regulated at the encoder to
Remote/sense
The power supply voltage of the measuring system is sensed via the sense
operation means: lines P sense and M sense (this is essentially a no–current measurement).
A controller compares the measuring system–supply voltage, sensed via
the remote/sense lines with the reference power supply voltage of the
measuring system. It then adjusts the power supply voltage for the measuring
system at the output of the drive module until the required power supply voltage
is obtained directly at the measuring system
This means, that the voltage drops along the power supply lines P encoder and
M encoder are compensated and corrected by the encoder power supply.
The power supply voltage is generated from a reference voltage source and is
5 V.
This means that it is possible to use cables up to 50 m long without operating
the measuring systems with an undervoltage.
Note
All of the data are only valid for SIEMENS pre–assembled cables as these are
dimensioned with the required conductor cross–section.
For the SIMODRIVE connection technology and also for the measuring system
suppliers, remote/sense operation is only provided for encoder systems with
voltage signals.
For encoder systems with current signals (7 µA ... 16 µA) the maximum
possible cable length of 18 m is defined by the signal outputs of the encoder
systems, as these can only drive a specific cable capacitance.
For motor measuring systems and mounted SIMODRIVE Sensor encoders, the
sense lines are connected in the encoder or in the connector at the encoder
side. For third–party encoder systems, customers must make this connection
themselves.
 Siemens AG 2001 All rights reserved
SIMODRIVE 611 Planning Guide (PJU) – 05.01 Edition
3 Motor Selection, Position/Speed Sensing
3.4 Direct position sensing

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