84 • vacon description of parameters
Tel. +358 (0)201 2121 • Fax +358 (0)201 212 205
7
Number of motor shaft turns corresponding to the distance specified in engineering
units [u] by ID1757 and ID1758 for the follower drive. Fractional part x 2
16
.
1761 Follower speed filter TI
(2.9.2.5)
Time constant [s] of the 1st order low-pass filter on follower speed measurement.
1762 PID control gain
(2.9.2.6)
Synchronization regulator proportional gain. The unity gain causes a speed correction of
1 u/s with a unity position error (1 u). Too high gain leads to oscillation.
1763 PID controller I gain
(2.9.2.7)
Synchronization regulator integral gain. The unity gain causes a speed correction
increment of 200 u/s per second with a unity position error (1 u). Integral action is
limited to +/- 10000 u/s of speed correction.
1764 Synchronization acceleration
(2.9.2.8)
Acceleration for the
Engage synchronization
command and deceleration for the
Release
synchronization
command [u/s
2
].
NOTE:
Synchronization release
command causes the drive to decelerate to standstill
under position control using the synchronization ramp par. ID1764. However, the
synchronization mode is disabled when Stop is requested or during a Fault response.
Therefore synchronization ramp (ID1764) is not used in these cases. The ramp time used
will be either par. ID104
Deceleration time 1
or ID503
Deceleration time 2
(whichever is
selected). ID104 (or ID503) should therefore be appropriately tuned for use as the
emergency ramp.
1765 GearRatio * 2
16
(2.9.2.9)
Electrical gear ratio of the follower speed and position reference to the master actual
speed and position. Useful for gear ratio change during run.
1 count = 1/2
16
ratio, that is the number 65536 represents unity ratio.
The range is from –262144 to + 262144 corresponding to a ratio of –4 to +4.
1766 Ratio ramp time
(2.9.2.10)
Ramp time in milliseconds for the variation of the ratio.
A change of ratio from 0 to +4 (242144 counts) takes a time equal to this parameter.
1767 Trim ratio change
(2.9.2.11)
Parameter for how much the trim + input ID1713 or trim - input ID1714 affects the ratio.
The setting range is 0-200%.
This function works only when running in synchronization mode. The ratio change uses
the ratio ramp time of par. ID1766. The new ratio target is ID1765 +ID1767*ID1765/100
when the trim + input is on and ID1765 - ID1767* ID1765/100 when the trim – input is
high.
1805 Distance for phasing
Set the distance in user units for phasing command. In fieldbus is used it is possible to
write phasing distance to this parameter by using the parameter ID number.
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