Siemens SIMOREG DC Master 6RA7028-6DS22 Operating Instructions Manual page 135

02.00
Pulse encoder input (see also Section 8, sheet G145)
Function
Supply (+13,7V to+15,2V)
Ground pulse encoder M
Track 1 Positive terminal
Negative terminal
Track 2 Positive terminal
Negative terminal
Zero marker Positive terminal
Negative terminal
Characteristic data of pulse tacho 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 (see also Section 8, sheet 17):
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 (see also Section 8, sheet 17):
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 frequency of the encoder pulses is 300kHz. To ensure correct evaluation of the encoder
pulses, the minimum distance T
must be observed:
Table 1:
1)
Differential voltage
2)
T
min
1) Differential voltage at terminals of evaluation electronics
2) The phase error L
G
calculated from T
min
L = ± (90° – f * T
G p min
L [°] = phase error
G
f [kHz] = pulse frequency
p
T [ns] = minimum distance between edges
min
This formula applies only if the encoder pulse/pause ratio is 1:1.
Siemens AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
Terminal
X173
26
27
28
29
30
31
32
33
between two encoder signal edges (tracks 1 and 2) specified in the table
min
Rated input voltage 5V
2V
630ns
(deviating from 90°), which may occur as the result of encoder and cable, can be
:
–6
* 360° * 10 )
Connection values/Remarks
200mA; short-circuit-proof (electronic protection)
Overload response: Fault message F018
Load:
(w/o switching losses, see below for cable, cable length,
shield connection)
Switching hysteresis: See below
Pulse/pause ratio:
Level of input pulses: See below
Track offset:
Pulse frequency:
Cable length:
>2.5V 8V
380ns 630ns
”5.25mA at 15V
1:1
Table 1 see below
Table 2 see below
See below
Rated input voltage 15V
10V
430ns
Connections
>14V
380ns
6-57