Siemens SIMOTRAS 6SG7050, Operating Instructions Manual

Page: 79 / 604

01.04 Connections
SIEMENS AG 6SG7000-0BA76
6-33
SIMOTRAS HD Operating Instructions
Pulse encoder input (see also Section 8, Sheet G145)
Function Terminal
X173
Connection values/Remarks
Supply (+13,7V to+15,2V)
26
Ground pulse encoder M 27
200mA; short-circuit-proof (electronic protection)
Overload response: Fault message F018
Warning signal A018
Track 1 Positive terminal
Negative terminal
28
29 Load:
≤
5.25mA at 15V
(w/o switching losses, see below for cable, cable length,
shield connection)
Track 2 Positive terminal
Negative terminal
30
31 Switching hysteresis: See below
Pulse/pause ratio: 1:1
Zero marker Positive terminal
Negative terminal
32
33 Level of input pulses: See below
Track offset:
Table 1 see below
Pulse frequency: Table 2 see below
Cable length: See below
Characteristic data of pulse encoder evaluation electronics
Level of input pulses:
Encoder signals (symmetrical and asymmetrical) up to a max. 27V differential voltage can be processed by
the evaluated electronics.
Electronic adaptation of evaluation electronics to signal voltage of encoder:
– Rated input voltage range 5V (P142=0):
Low level: Differential voltage <0.8V
High level: Differential voltage >2.0V
Hysteresis: >0.2V
Common-mode control range: ±10V
– Rated input voltage range 15V (P142=1):
Low level: Differential voltage <5.0V
High level: Differential voltage >8.0V Restriction: See switching frequency
Hysteresis: >1V
Common-mode control range: ±10V
If the pulse encoder does not supply symmetrical encoder signals, then its ground must be routed as a
twisted-pair lead with every signal cable and connected to the negative terminals of track 1, track 2 and the
zero marker.
Switching frequency:
The maximum permitted frequency of the encoder pulses is 300kHz. To ensure correct evaluation of the
encoder pulses, the minimum distance T
min
between two encoder signal edges (tracks 1 and 2) specified in
the table must be observed:
Table 1:
Rated input voltage 15V 5V Rated input voltage 15V 15V
Differential voltage
1)
2V >2,5V 8V 10V >14V
T
min
2)
630ns 380ns 630ns 430ns 380ns
1) Differential voltage at terminals of evaluation electronics
2) The phase error L
G
(deviating from 90°), which may occur as the result of encoder and cable, can be
calculated from T
min
:
L
G
= ± (90° – f
p
* T
min
* 360°)
L
G
= phase error
f
p
= pulse frequency
T
min
= minimum distance between edges
This formula applies only if the encoder pulse ratio is 1:1.