Sensor type SASA general
Versions, code numbers and weights for SASA sensor
SASAIIC
SASAIIC CAN message protocol..................................................................................................................................................6
SASAIID CAN message protocol..................................................................................................................................................9
Read data by identifier............................................................................................................................................................12
Write data by identifier...........................................................................................................................................................14
SASAIID configuration data list.................................................................................................................................................17
Code number and weight, SAK adapter kit..........................................................................................................................20
The SASA sensor detects the absolute position and speed of the steering wheel. The sensor can be used
in electro-hydraulic steering systems using Danfoss OSPE, EHI, or EHPS steering valves with
programmable controller or in any other steering system where the rotation of the steering wheel must
be detected as an electronic signal.
There are two versions available of SASA sensors:
SASAIIC used for PVED-CL actuator. SASAIIC has single CAN output signal and “fail silent” concept
SASAIID used for PVED-CLS actuator and general usage. SASAIID has dual CAN output signal.
The use of SASA sensor is relevant e.g. for variable steering ratio and closed loop set-ups where steering
wheel position and steering angle have to match.
The SASA sensor also can be used for “kick out” of Auto-steering. When the steering valve is in autoguidance mode, and the driver wants to swap to manual steering, a signal from the SASA sensor will
deactivate the Auto-steering and the steering wheel movement has priority.
SASA is based on a non-contact inductive principle giving a very high resolution.
The sensor features a robust design and resists e.g. electro-magnetic radiation.
The output is a CAN signal, which makes it easy to interface to advanced vehicle controllers and to
Danfoss PVED-CLS actuators for steering valves.
The steering wheel shaft turns the rotor of the SASA sensor, and the sensor is simply mounted between
steering unit and steering column. The shaft of the steering column must be 15 mm longer when using
SASA sensor.
In cases where customers want to use the same steering column in applications with and without SASA
sensors, Danfoss offers an adapter kit type SAK to built in between column and sensor.
Interface: CAN 2.0 B
Baud rate: 125 kBaud, 250 kBaud (default), 500 kBaud
SASA returns cyclic the following CAN message every 5, 10 (default) or 20 ms.
12 bit word (0 – 4095) relative to a 0-index point.
0 = 0 degrees
4095 = 359,912 degrees
Overflow at 4095 for CW activation shall increment 0
Underflow at 0 for CCW activation shall decrement 4095
CountByte (0-255)
Increments 1 for each message
Steering
angle change
Difference between 2 transmitted position values in succession.
16 bit integer with 2’s complementary encoding for negative values (-32768 to 32767).
Termination resistor:120 ohm (optional)
Baud rate:125, 250 or 500 kb/s
Angle:12-bit word (0 - 4095) relative to a programmable 0-index point.
Resolution:< 0.1°
Linearity:1% of full scale
Angle change:16 bit integer with 2’s complementary encoding for negative values (-32768 to 32767).
Safety function
If a failure occurs, the SASA CAN transceiver will be disabled.
Environmental
Operating temperature:-30° to 85°C [-22 to 185°F]
Storage temperature:-40° to 105°C
Sealing:IP65
EMI/RFI Rating:100 V/m
Vibration:Meets IEC 60068-2-64
Shock:Meets IEC 60068-2-27 test Ea
The PVED-CLS (valve controller) can interface to a SASA with redundant output. A safety function that
compares the two output messages from SASA is implemented in the PVED-CLS. There is a 180-degree
phase shift between the two angles transmitted in the messages. Steering angle 1 and steering angle 2
are sampled with a delay < 2ms. The ID1 and ID2 messages are transmitted with a delay < 5ms. It is
possible to configure the sensor to transmit cyclic 1 or 2 messages.
Interface: CAN 2.0 B
Baud rate: 250 kBaud
Transmit rate: 10, 20, 50 (default), 100, 200 ms (cyclic message transmission, 1 or 2 messages, tolerance: ±
IdentifierJ1939 proprietary B. Programmable 29 bit message id.
ID1 = $0CFFYYXX
PGN-offset1 YY is programmable, default value is $10
Source Address XX is programmable, default value is $4D
Steering
angle 1
Data byte 0-1: Value measured by angle sensor 1 relative to the 0-index point.
16-bit integer
0 corresponds to 0 degrees
4095 corresponds to 359.912 degrees
Overflow at 4095 for CW activation shall increment 0
Underflow at 0 for CCW activation shall decrement 4095
4096 – 65534: Not available
65535:Sensor failure
Steering
angle
velocity 1
Data byte 2-3: Velocity of the rotor measured by sensor 1.
16-bit integer
0 corresponds to -300 RPM (CCW)
20480 corresponds to 0 RPM
40960 corresponds to 300 RPM (CW)
40961 – 65534: Not available
65535: Sensor failure
J1939 proprietary B. Programmable 29 bit message id.
ID2 = $0CFFZZXX
PGN-offset2 ZZ is programmable, default value is $11
Source Address XX is programmable, default value is $4D
Data byte 0-1: Value measured by angle sensor 2 (with a 180 degree offset to Steering
angle 1).
16-bit integer
0 corresponds to 180 degrees
4095 corresponds to 179.912 degrees
Overflow at 4095 for CW activation shall increment 0
Underflow at 0 for CCW activation shall decrement 4095
4096 – 65534: Not available
65535:Sensor failure
Steering
angle
velocity 2
Data byte 2-3: Velocity of the rotor measured by sensor 2.
16-bit integer
0 corresponds to -300 RPM (CCW)
20480 corresponds to 0 RPM
40960 corresponds to 300 RPM (CW)
40961 – 65534: Not available
65535: Sensor failure
ReservedData byte 4: $FF
StatusData byte 5
76543210
Error CodeSequence number
Error CodeBit 4-7
$0 - Reserved
$1 - Sensor Chip Error
$2 - Steering angle failure
$3 - CAN input message failure
$4 - Power failure
$5 - CPU failure
$6 - Memory failure
$7-$D - Reserved
$E - Temperature warning
$F - No error
Sequence numberBit 0-3
Increments 1 for each message.
Valid range is $0 - $F
CRC-16Data byte 6-7: The CRC16 polynomial 0xC86C is used to calculate a checksum for byte
Termination resistor:120 ohm (optional)
Baud rate:250 kb/s
Angle:12-bit word (0 - 4095) relative to a programmable 0-index point.
Resolution:< 0.1°
Linearity:<1% of full scale
Angle change:16 bit integer. Values: primary message from 0–40960. Redundant message: the same
but with 20480 offset.
Safety function
Dual CAN output signal (the CAN signals are supervised by the PVED-CLS actuator or alternative external
safety controller).
However, the SASAIID has built in these safety and monitoring functions:
•
Sensor chip diagnostics
•
Steering angle cross-check
•
MCU heartbeat check: the two microcontrollers check each other's aliveness
•
Power-on memory check
Environmental
Operating temperature:-40° to 105°C [-40° to 221°F]
Storage temperature:-55° to 105°C [-67° to 221°F]
Sealing:IP65
EMI/RFI Rating:150 V/m
Vibration:Meets IEC 60068-2-64
Shock:Meets IEC 60068-2-27 test Ea
SASA has to be mounted between steering column and steering unit (OSP) with 4 bolts max 30 N•m
[265.5 lbf•in]. Shaft in column must be 15 mm [0.59 in] longer when using SASA.
Assembly: SASA sensor and OSP steering unit
1. SASA sensor
2. OSP steering unit
Caution
Make sure that the spline profile of the SASA sensor is aligned to the spline profile of the steering column
shaft. A safe method of assembly is to place SASA sensor on the steering column spline shaft first – and
not opposite! In case of using force, there is a risk of bending the spline profile of SASA sensor.
For use of original steering column, use adapter kit type SAK, see sketch below.
Assembly: SAK adapter kit, SASA sensor and OSP steering unit
Protect wires from mechanical abuse, run wires in flexible metal or plastic conduits.
•
Use 85˚ C (185˚ F) wire with abrasion resistant insulation and 105˚ C (221˚ F) wire should be
considered near hot surfaces.
•
Use a wire size that is appropriate for the module connector.
•
Separate high current wires such as solenoids, lights, alternators or fuel pumps from sensor and other
noise-sensitive input wires.
•
Run wires along the inside of, or close to, metal machine surfaces where possible, this simulates a
shield which will minimize the effects of EMI/RFI radiation.
•
Do not run wires near sharp metal corners, consider running wires through a grommet when
rounding a corner.
•
Do not run wires near hot machine members.
•
Provide strain relief for all wires.
•
Avoid running wires near moving or vibrating components.
•
Avoid long, unsupported wire spans.
•
Ground electronic modules to a dedicated conductor of sufficient size that is connected to the
battery (-).
•
Power the sensors and valve drive circuits by their dedicated wired power sources and ground
returns.
•
Twist sensor lines about one turn every 10 cm (4 in).
•
Use wire harness anchors that will allow wires to float with respect to the machine rather than rigid
anchors.
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000
Danfoss
Power Solutions Trading
(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 3418 5200
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