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Encoder Systems (GE)
1.2 1FT6, 1FK6, 1PH motors
1.2.2
Incremental
encoders
1 V
GE
1)
V
: Phase voltage of phase U with respect to the artifical neutral point (refer to Fig. 1-9)
U–Υ
GE/1-12
Integrated encoders
Version:
pp
Coupling:
Application:
Evaluation:
Output signals:
Connection:
Application:
Note
When an encoder is replaced, the relative position of the encoder system to the
motor EMF must be adjusted (not for 1PH motors).
Adjustment:
When adjusting, the motor is rotated in the clockwise direction when viewing the
drive end. The rotor is rotated so that a zero crossover of the motor EMF V
1)
with a positive gradient coincides with the encoder reference signal. For a
6–pole motor, the following signal characteristics are obtained after adjustment
(the reference signal is shown somewhat thicker):
U [V]
Fig. 1-8
Signal characteristics of the motor EMF and reference signal
Fig. 1-9
A recommendation as to how an artificial neutral point can be created
Optical encoder system
On the NDE (integrated in the motor)
S
Tacho for speed actual value sensing
S
Rotor position encoder for inverter control
S
Indirect measuring system for the position control loop
Incremental
Sinusoidal
Connector
1FT6, 1FK6, 1PH7, 1PH4
Reference signal (zero mark)
1)
EMF U
U–Y
U
V
U–Y
3 10kW
M
Siemens AG 2000 All rights reserved
SIMODRIVE Planning Guide Motors (PJM) – 11.00 Edition
09.00
U–Υ
t
6SN1197–0AA20
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