L-9517-9563-06-A_Data_sheet_ATOM_en.pdf - 第25页

25 A TOM miniature encoder system Analogue outputs V 0 V 1 V 2 − V 0 V 1 V 2 + 120R Remote CAL operation CAL 0 V Remote operation of the CAL is possible via the CAL pin. For applications where no interf ace is used, remo…

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24 ATOM miniature encoder system
Electrical connections
Grounding and shielding
Cable readhead
Shield
Connector / interface
Customer electronics
IMPORTANT: The shield should be connected to the machine earth (Field Ground).
NOTE: Maximum cable length between interface and customer electronics is 25m for ACi and Ri and 50m for Ti depending on
clocked output.
FPC readhead
FPC cable
Shield
(recommended)
Output signals
5 V
0 V
ACi / customer electronics
For more information on FPC refer to the installation guide.
Output signals
5 V
0 V
25 ATOM miniature encoder system
Analogue outputs
V
0
V
1
V
2
−
V
0
V
1
V
2
+
120R
Remote CAL operation
CAL
0 V
Remote operation of the CAL is possible via the CAL pin. For applications where no interface is used,
remote CAL operation is essential.
Recommended signal termination
Digital outputs
Interface
A B Z E+
Cable Z
0
= 120R
Customer
electronics
A B Z E−
120R
Standard RS422A line receiver circuitry.
Capacitors recommended for improved noise immunity.
220 pF
0 V
0 V
220 pF
26 ATOM miniature encoder system
Incremental 2 channels V
1
and V
2
differential sinusoids in quadrature, centred ~ 1.65 V (90° phase shifted)
Bi-directionally repeatable.
1
Differential pulse V
0
centred on 45°.
Reference
(V
0
+)−(V
0
−)
360° (nom)
0.7 to 1.35Vpp with green LED indication
(readhead) and 120R termination.
40 / 20 µm
(V
1
+)−(V
1
−)
(V
2
+)−(V
2
−)
0°
(after CAL)
45°
1Vpp
Differential signals V
0
+ and V
0
− centred on ~ 1.65V.
Output specications
Analogue output signals
All ATOM readheads and Ri and Ti analogue interfaces
1
Only calibrated reference mark is bi-directionally repeatable.