Safety
Product
Mechanical
Information
Information
Installation
Absolute SSI communications only encoder, or
Absolute Sincos encoder with SSI
Encoder type
Encoder power supply voltage
Encoder number of lines per
revolution. (SC.SSI only)
SSI binary format select
Encoder turn bits
Encoder single turn comms resolution
Encoder comms baud rate
Encoder error detection level
UVW commutation signal only encoders*
Encoder type
Encoder power supply voltage
Encoder number of lines per
revolution
Encoder error detection level
* This feedback device provides very low resolution feedback and should not be used for applications requiring a high level of performance.
Due to the low resolution of UVW communication only encoders, it is recommended that the speed feedback filter in Pr 3.42 is set to its maximum
value. A value of 1ms to 2ms may also be required in the current demand filter (Pr 4.12) and it is also recommended that the speed loop gains are set
to a low value to obtain stable operation.
7.5.3
Restriction of encoder number of lines per revolution
Although Pr 3.34 can be set to any value from 0 to 50,000 there are restrictions on the values actually used by the drive. These restrictions are
dependent on the software version as follows:
Software version V01.06.01 and later
Table 7-4 Restrictions of drive encoder lines per revolution with software version V01.06.01 and later
Position feedback device
Ab, Fd, Fr, Ab.SErVO, Fd.SErVO,
Fr.SerVO, SC
SC.HiPEr, SC.EndAt, SC.SSI
(rotary encoders)
SC.HiPEr, SC.EndAt, SC.SSI
(linear encoders
Unidrive SP User Guide
Issue Number: 13
Electrical
Getting
Basic
installation
Started
parameters
the motor
SSI (10) for a SSI communications only encoder
Pr 3.38
SC.SSI (11) for a Sincos encoder with SSI
Pr 3.36
5V (0), 8V (1) or 15V (2)
Set to the number of sine waves per revolution of the encoder.
Pr 3.34
See section 7.5.3 Restriction of encoder number of lines per revolution on page 135 for
restrictions on this parameter.
Pr 3.41
OFF (0) for gray code, or On (1) for binary format SSI encoders
Pr 3.33
Set to the number of turn bits for the encoder (this is usually 12bits for a SSI encoder)
Pr 3.35
Set to the single turn comms resolution for the encoder (this is usually 13bits for a SSI encoder)
Pr 3.37
100 = 100k, 200 = 200k, 300 = 300k, 500 = 500k, 1000 = 1M, 1500 = 1.5M, or 2000 = 2M
0 = Error detection disabled
1 = Wire break detection on Sin and Cos inputs (SC.SSI only)
2 = Phase error detection (SC.SSI only)
3 = Wire break detection and phase error detection (SC.SSI only)
Pr 3.40
4 = SSI power supply bit monitor
5 = SSI power supply bit monitor and wire break detection (SC.SSI only)
6 = SSI power supply bit monitor and phase error detection (SC.SSI only)
7 = SSI power supply bit monitor, wire break detection and phase error detection (SC.SSI only)
Pr 3.38
Ab.servo
Pr 3.36
5V (0), 8V (1) or 15V (2)
Pr 3.34
Set to zero
Pr 3.40
Set to zero to disable wire break detection
The drive uses the value in Pr 3.34.
If Pr 3.34 ≤1, the drive uses the value of 1.
If 1< Pr 3.34 <32,768, the drive uses the value in Pr 3.34 rounded down to nearest value that is a power of 2.
If Pr 3.34 ≥32,768, the drive uses the value of 32,768.
The drive uses the value in Pr 3.34.
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