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Unidrive SPM User Guide
135
Issue Number: 3 www.controltechniques.com
9.6.3 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 9-4 Restrictions of drive encoder lines per revolution with software version V01.06.01 and later
Software version V01.06.00 and earlier
Table 9-5 Restrictions of drive encoder lines per revolution with software version V01.06.00 and earlier
At power-up Pr
3.48
is initially zero, but is set to one when the drive encoder and any encoders connected to any Solutions Modules have been
initialised. The drive cannot be enabled until this parameter is one.
Encoder initialisation will occur as follows:
•
At drive power-up
•
When requested by the user via Pr
3.47
•
When trips PS.24V, Enc1 to Enc8, or Enc11 to Enc17 trips are reset
•
The encoder number of lines per revolution (Pr
3.34
) or the number of motor poles (Pr
5.11
and Pr
21.11
) are changed (software version
V01.08.00 and later).
Initialisation causes an encoder with communications to be re-initialised and auto-configuration to be performed if selected. After initialisation
Ab.SErVO, Fd.SErVO and Fr.SErVO encoders will use the UVW commutations signals to give position feedback for the first 120° (electrical) of
rotation when the motor is restarted.
Position feedback device
Equivalent Lines per revolution used by the drive
Ab, Fd, Fr, Ab.SErVO, Fd.SErVO,
Fr.SerVO, SC
The drive uses the value in Pr
3.34
.
SC.HiPEr, SC.EndAt, SC.SSI
(rotary encoders)
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.
SC.HiPEr, SC.EndAt, SC.SSI
(linear encoders
The drive uses the value in Pr
3.34
.
Position feedback device
Equivalent Lines per revolution used by the drive
Ab, Fd, Fr
If Pr
3.34
<2, the drive uses the value of 2.
If 2
≤
Pr
3.34
.≤
16,384, the drive uses the value in Pr
3.34.
If Pr
3.34
>16,384, the drive uses the value in Pr
3.34
rounded down to nearest value divisible by 4.
Ab.SErVO, Fd.SErVO, Fr.SErVO
If Pr
3.34
≤
2, the drive uses the value of 2.
If 2< Pr
3.34
<16,384, the drive uses the value in Pr
3.34
rounded down to nearest value that is a power of 2.
If Pr
3.34
≥
16,384, the drive uses the value of 16,384.
SC, SC.HiPEr, SC.EndAt, SC.SSI
If Pr
3.34
≤
2, the drive uses the value of 2.
If 2< 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.