Absolute encoders - SSI
End shaft max. ø14 mm
Optical singleturn encoder 14 bit
GXA2S - SSI
Features
– Encoder singleturn / SSI
– Optical sensing
– Resolution: 14 bit
– End shaft ø12 mm / ø14 mm
– Electronic setting of zero point
– Permanent check of code continuity
– Counting direction input
– For high positive and negative acceleration
– Available with additional incremental output
GXA2S with end shaft
Technical data - electrical ratings
Voltage supply
Consumption w/o load
Initializing time (typ.)
Interfaces
Steps per turn
Incremental output
Absolute accuracy
Sensing method
Code
Code sequence
Inputs
10...30 VDC
≤50 mA (24 VDC)
20 ms after power on
SSI, Incremental A 90° B
(optional)
16384 / 14 bit
2048 pulses A90°B
+ inverted
±0.025°
Optical
Gray or binary
CW/CCW coded by connection
SSI clock
Control signals UP/DOWN and
zero
SSI data linedriver RS485
Diagnostic and incremental
outputs
DIN EN 61000-6-2
DIN EN 61000-6-4
Self-diagnosis
Code continuity check
UL approval / E63076
Reverse polarity protection Yes
Technical data - mechanical design
Housing
Shaft
Protection DIN EN 60529
Operating speed
Starting torque
Rotor moment of inertia
Materials
Operating temperature
Relative humidity
Resistance
ø58 mm
ø12 mm end shaft
ø14 mm end shaft
IP 54
≤6000 rpm (mechanical)
≤6000 rpm (electric)
≤0.015 Nm IP 54
20 gcm²
Housing: steel
Flange: aluminium
-25...+85 °C
-40...+85 °C (optional)
95 % non-condensing
Subject to modification in technic and design. Errors and omissions excepted.
30/10/2008
Output circuit
DIN EN 60068-2-6
Vibration 10 g, 16-2000 Hz
DIN EN 60068-2-27
Shock 100 g, 6 ms
250 g
Connector, 12-pin
Weight approx.
E-connection
Interference immunity
Emitted interference
Diagnostic functions
Approval
1
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Absolute encoders - SSI
End shaft max. ø14 mm
Optical singleturn encoder 14 bit
GXA2S - SSI
Part number
Singleturn
GXA2S.
Pulses / Incremental output
No incremental output
2048 pulses / push-pull
2048 pulses / RS422
2048 pulses / sine 1 Vpp
Accessories
Connectors and cables
(page %S)
Z 130.001
Z 130.003
Z 130.005
Z 130.007
Z 182.001
Z 182.003
Z 182.005
Z 119.023
Z 119.024
Z 119.041
Z 119.050
Z 119.053
Z 119.070
Z 119.072
Z 119.073
Z 119.076
Z 119.082
Data transfer
tp
Subject to modification in technic and design. Errors and omissions excepted.
Female connector M23, 12-pin, less cable
Female connector M23, 12-pin, 2 m cable
Female connector M23, 12-pin, 5 m cable
Female connector M23, 12-pin, 10 m cable
Female connector M23, 12-pin, less cable
(incr.)
Female connector M23, 12-pin, 2 m (incr.)
Female connector M23, 12-pin, 5 m (incr.)
Spring coupling for encoders with ø58 mm
housing
Torque support and spring washer for
encoders with 9.5 mm pin
Torque support by rubber buffer element for
encoders with 15 mm pin
Spring coupling
Spring coupling height 19.1 mm
Spring coupling height 29.1 mm
Spring coupling for encoders with ø58 mm
housing, hole distance 73 mm
Spring coupling for encoders with ø58 mm
housing, hole distance 68 mm
Spring coupling for encoders with ø58 mm
housing
Spring coupling for encoders with ø58 mm
housing, hole distance 63 mm
02
04
06
07
E-connection
A1
Connector M23, 12-pin, radial
A3
Connector M23, 12-pin, radial,
for incremental output 04/06/07
30
32
90
92
0
1
B
4
5
F
Voltage supply / signals
10...30 VDC / gray code 13 bit
10...30 VDC / binary code 13 bit
10...30 VDC / gray code 14 bit
10...30 VDC / binary code 14 bit
Mounting accessories
(page %S)
End shaft
End shaft ø12 mm without pin
End shaft ø12 mm with pin 15 mm
End shaft ø12 mm with pin 9.5 mm
End shaft ø14 mm without pin
End shaft ø14 mm with pin 15 mm
End shaft ø14 mm with pin 9.5 mm
T=1/f
clock
data
tv
bit n
bit n-1
bit 3
bit 2
bit 1
tm
Clock frequency f
Scan ratio of T
Time lag tv
Monoflop time tm
Clock interval tp
62.5...1500 kHz
40...60 %
150 ns
25 µs + T/2
30 µs
2
www.baumerivo.com
30/10/2008
Absolute encoders - SSI
End shaft max. ø14 mm
Optical singleturn encoder 14 bit
GXA2S - SSI
Terminal significance
UB
GND
Data+
Data-
Clock+
Encoder voltage supply.
Encoder ground connection relating to UB.
Positive, serial data output of differential
linedriver.
Negative, serial data output of differential
linedriver.
Positive SS clock input.
Clock+ together with clock- forms a current
loop. A current of approx. 7 mA towards
clock+ input means logic 1 in positive logic.
Negative SSI clock input.
Clock- together with clock+ forms a current
loop. A current of approx. 7 mA towards
clock- input means logic 0 in positive logic.
Input for setting a zero point anywhere
within the programmed encoder resolution.
The zero setting operation is triggered by a
High impulse and has to be in line with the
selected direction of rotation (UP/DOWN).
Connect to GND after setting operation for
maximum interference immunity. Impulse
duration >100 ms.
Diagnostic output.
An error warning is given at level Low.
Important: Interferences must be drained
by the downstram electronics.
UP/DOWN counting direction input.
This input is standard on High. UP/DOWN
means ascending output data with clock-
wise shaft rotation when looking at flange.
UP/DOWN-Low means ascending values
with counterclockwise shaft rotation when
looking at flange.
Incremental tracks A 90° B and inverted.
Terminal assignment
GXA2S
Connector
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
Pin 11
Pin 12
Core colour
brown
black
blue
beige
green
yellow
violet
pink
–
–
–
Assignment
UB
GND
Clock+
Data+
Zero setting
Data-
Clock-
UP/DOWN
–
–
–
Clock-
brown/yellow DATAVALID
Zero setting
GXA2S with incremental tracks
Connector
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Pin 10
Pin 11
Pin 12
Core colour
brown
white
blue
green
grey
yellow
red
red/blue
pink
violet
black
grey/pink
Assignment
UB
GND
Clock+
Data+
Zero setting
Data-
Clock-
Track B inv.
UP/DOWN
Track A inv.
Track B
Subject to modification in technic and design. Errors and omissions excepted.
30/10/2008
DATAVALID
UP/DOWN
Incremental
Outputs
Track A
8
7
6
5
12
9 1
10
11
2
3
4
Please use cores twisted in pairs (for
example clock+ / clock-) for extensi-
on cables of more than 10 m length.
3
www.baumerivo.com
Absolute encoders - SSI
End shaft max. ø14 mm
Optical singleturn encoder 14 bit
GXA2S - SSI
Trigger level
SSI
SSI-Clock
SSI-Data
Control inputs
Input level High
Input level Low
Input resistance
Diagnostic outputs or
Incremental outputs
Output level High
Output level Low
Load High
Load Low
Dimensions
GXA2S
58
20
15 (9.5)
49.5
7.5
Circuit
Optocoupler
Linedriver RS485
Input circuit
>0.7 UB
<0.3 UB
10 kΩ
Output circuit
Push-pull circuit-proof
>UB -3.5 V (I = -20 mA)
<0.5 V (I = 20 mA)
<20 mA
<20 mA
Incremental outputs
Output level High
Output level Low
Load High
Load Low
Outputs
Input level
Load
Linedriver RS422
>2.5 V (I = -20 mA)
<0.5 V (I = 20 mA)
<20 mA
<20 mA
Sine / Cosine
1 Vpp ±10 %
<10 mA
Connector dimensions
59
47
42
M
15°
(6
x)
16
30
4
www.baumerivo.com
30/10/2008
Subject to modification in technic and design. Errors and omissions excepted.
3
x6
6
1
3.5
ø4 fg6
59
ø14 H7 x 35 (ø12 H7 x 35)
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