28
Commander SE Advanced User Guide
Issue Number: 4
Since the ramp rate is defined in s/100Hz and the S ramp parameter is defined in s2/100Hz, the time T for the 'curved' part of
the S can be determined quite easily by dividing the two variables thus:
T = S-ramp rate of change / Ramp rate
Enabling S-ramp increases the total ramp time by the period T since an additional T/2 is added to each end of the ramp in
producing the S.
Although the ramp rate can be set to 0.0, there is a minimum ramp time within the software of 0.1s/100Hz
.
This voltage is used as the level for standard ramp modes. If it is set too low the machine will coast to rest, and if it is set too
high and no braking resistor is used it may trip on OV. The minimum level should be greater than the voltage produced on the
DC Bus by the highest supply voltage. Normally the DC Bus voltage will be approximately the rms supply voltage x
√
2.
Care should be taken in the setting of this parameter. It is recommended that the setting should be at least
50V higher than the maximum expected level of the DC Bus voltage. If this is ignored, the motor may fail to
decelerate on a STOP command.
This parameter is used to select acceleration ramp rates as follows:
0
Ramp rate selection by terminal input
1
Ramp rate 1 selected
2
Ramp rate 2 selected
3
Ramp rate 3 selected
4
Ramp rate 4 selected
5
Ramp rate 5 selected
6
Ramp rate 6 selected
7
Ramp rate 7 selected
8
Ramp rate 8 selected
9
Ramp rate selection by preset reference selection
When parameter
2.10
is set to 0 the acceleration ramp rate selected depends on the state of bit parameters
2.32
,
2.33
&
2.34
. These bits are for control by digital inputs such that ramp rates can be selected by external control. The ramp rate
selected depends on the binary code generated by these bits as follows:
2.08
Standard ramp voltage
Ú
400V drive: 0 ~ 800
200V drive: 0 ~ 400
Ö
400V drive: 750 (Eur)
775 (USA)
200V drive: 390
RW
Uni
t
Acceleration
Actual Speed
Programmed
ramp rate
T
T
T/2
T/2
T/2
T/2
S ramp
acceleration
rate of change
Demanded Speed
NOTE
2.09
Unused parameter
2.10
Acceleration ramp selector
Ú
0 ~ 9
Ö
0
RW
Uni
CAUTION
Содержание COMMANDER SE
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Страница 142: ...142 Commander SE Advanced User Guide Issue Number 4 Figure 6 9 Input line reactor 4400 0241 All dimensions in mm...
Страница 144: ...144 Commander SE Advanced User Guide Issue Number 4 Figure 7 3 Commander SE Size 4 All dimensions in mm...