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Menu 2
Unidrive SP Advanced User Guide 39
Issue Number: 7 www.controltechniques.com
2: Standard ramp with motor voltage boost
This mode is the same as normal standard ramp mode except that the motor voltage is boosted by 20%. This increases the losses in the motor giving
faster deceleration.
Setting this parameter enables the S ramp function. S ramp is disabled during deceleration when the standard ramp voltage controller is active. When
the motor is accelerated again after decelerating in standard ramp the acceleration ramp used by the S ramp function is reset to zero.
This parameter defines the maximum rate of change of acceleration/deceleration. The default values have been chosen such that for the default
ramps and maximum speed, the curved parts of the S will be 25% of the original ramp if S ramp is enabled.
Since the ramp rate is defined in s/100Hz or s/1000rpm and the S ramp parameter is defined in s
2
/100Hz or s
2
/1000rpm, the time T for the 'curved'
part of the S can be determined from:
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.
2.06 S ramp enable
Drive modes Open-loop, Closed-loop vector, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default Open-loop, Closed-loop vector, Servo 0
Update rate 4ms read
2.07 S ramp acceleration limit
Drive modes Open-loop, Closed-loop vector, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Closed-loop vector and Servo DP = 3
Range
Open-loop
Closed-loop vector and servo
0.0 to 300.0 s
2
/100Hz
0.000 to 100.000 s
2
/1,000rpm
Default
Open-loop
Closed-loop vector
Servo
3.1
1.500
0.030
Update rate Background read
DC Bus voltage
Motor Speed
Programmed
deceleration
rate
t
Controller
operational
t
Acceleration
Actual Speed
Programmed
ramp rate
TT
T/2 T/2 T/2T/2
S ramp
acceleration
ramp
Demanded Speed
http://nicontrols.com
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