Parameter
structure
Keypad and
display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
Menu 2
Unidrive SP Advanced User Guide
45
Issue Number: 10 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. If the S ramp is disabled (Pr
2.06
= 0) a linear ramp is used and the
time in seconds taken for the ramp output to change by frequency (
Δ
f*) or speed (
Δ
w*) is given by:
Frequency (Open-loop mode)
T
Ramp =
Δ
f* x A / 100
where A is the selected ramp rate in s / 100Hz
Speed (Closed-loop vector and servo)
T
Ramp =
Δ
w* x A / 1000
Where A is the selected ramp rate in s / 1000rpm
If the S ramp is enabled (Pr
2.06
= 1) then the ramp time is extended as shown in the diagram below.
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
1
1
1
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
1
1
1
1
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
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