Siemens SIMOVERT MASTERDRIVES Manual page 670

Technology Option F01
Standard encoder
Encoder selection
P130
9.4.6 Multiturn encoder evaluation [260, 270]
CAUTION
Principle
Encoder supply
voltage
Cable length
P149.01, P149.07
9-22
The ERN 1387 sin/cos encoder manufactured by Heidenhain is used as
the standard encoder. The following parameters are initialized for this
encoder:
Number of Lines for Sin/Cos Encoder ERN1387
Signal Periods/
Par. Value
Revolution
2 11 = 2048
P136 11
For induction machines1PH4, 1PH7(=1PA6) and 1PL6, the ERN1381
type of encoder made by the Heidenhain company is frequently used.
The ERN1381 does not have any C/D tracks for detecting the initial
position. P130 = 7 must be used for this type of encoder.
Par. Value
P130 7
The absolute initial position is not set in the case of encoders without
C/D track. These encoders can be used with induction machines only.
The position is corrected by a zero pulse where applicable.
The encoder cable must not be pulled out or inserted in a live state as
otherwise the encoder may be destroyed!
The multiturn encoder is an absolute encoder. It detects the number of
revolutions, in addition to the rotor position from 0° to 360°. On
initialization, the start position is transmitted to the converter using a
serial protocol. The revolution information is always stored on the
encoder, i.e. even after a power failure, wire break or component
replacement. Referencing is therefore not required.
In addition to the signal processing circuits, the sensor board is
equipped with the encoder power supply.
The supply voltage for the encoder is set by the same method used for
the sin/cos encoder.
The serial protocol of the coded rotary encoder is implemented as a
synchronous protocol. Communication takes place according to the
master (converter)/slave principle. The cable length is limited by the
transmission times from converter to encoder and back.
Incr./
Revolution
8192
Encoder without C/D track
6SE7087-6QX70 (Version AG)
Compendium Motion Control
05.2006
Encoder resolution
Siemens AG
SIMOVERT MASTERDRIVES