Parameter
structure
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display
Parameter
x.00
Parameter
description format
Advanced parameter
descriptions
Macros
Serial comms
protocol
Electronic
nameplate
Performance RFC mode
Menu 4
Unidrive SP Advanced User Guide
105
Issue Number: 10 www.controltechniques.com
Regen
The defaults Kp and Ki gains should be suitable for the standard regen inductors. If the input inductance is significantly higher the gains should be
adjusted as described for the Closed-loop vector and Servo modes. See Pr
on page 85 for guidelines on setting the regen unit current controller
gains. The table given for the relative levels of current controller gains for closed-loop vector and servo modes also applies to regen mode.
The motor is modelled thermally in a way that is equivalent to the electrical circuit shown as follows.
The temperature of the motor as a percentage of maximum temperature, with a constant current magnitude of I, constant value of K and constant
value of motor rated current (set by Pr
5.07
or Pr
21.07
) after time t is given by
Temp = [I
2
/ (K x Motor rated current)
2
] (1 - e
-t/
τ
) x 100%
This assumes that the maximum allowed motor temperature is produced by K x Motor rated current and that
τ
is the thermal time constant of the point
in the motor that reaches its maximum allowed temperature first.
τ
is defined by Pr
4.15.
The estimated motor temperature is given by Pr
4.19
as a
percentage of maximum temperature. If Pr
4.15
has a value between 0.0 and 1.0 the thermal time constant is taken as 1.0.
If the rated current (defined by Pr
5.07
or Pr
21.07
depending on which motor is selected) is less or equal to the maximum Heavy Duty rating then
Pr
4.25
can be used to select 2 alternative protection characteristics (see diagram below). If Pr
4.25
is 0 the characteristic is for a motor which can
operate at rated current over the whole speed range. Induction motors with this type of characteristic normally have forced cooling. If Pr
4.25
is 1 the
characteristic is intended for motors where the cooling effect of motor fan reduces with reduced motor speed below half of rated speed. The maximum
value for K is 1.05, so that above the knee of the characteristics the motor can operate continuously up to 105% current. (In Regen mode K = 1.05
over the whole operating frequency range).
Unidrive
Unidrive SP
Switching freq
Proportional gain
Integral gain
Switching freq
Proportional gain
Integral gain
3kHz
Pr
4.13
x 0.5
Pr
4.14
3kHz
Pr
4.13
Pr
4.14
4.5kHz
Pr
4.13
x 0.75
Pr
4.14
4kHz
Pr
4.13
x 1.5
Pr
4.14
6kHz
Pr
4.13
Pr
4.14
6kHz
Pr
4.13
x 2
Pr
4.14
9kHz
Pr
4.13
x 0.75
Pr
4.14
8kHz
Pr
4.13
x 2
Pr
4.14
x 1.3
12kHz
Pr
4.13
Pr
4.14
12kHz
Pr
4.13
x 2.6
Pr
4.14
x 1.3
16kHz
Pr
4.13
x 2
Pr
4.14
x 1.3
4.15
Thermal time constant
Drive modes
Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit
SP
FI
DE
Txt VM DP ND RA NC NV
PT
US RW BU
PS
1
1
1
Range
Open-loop, Closed-loop vector, Servo,
Regen
0.0 to 3000.0
Default
Open-loop, Closed-loop vector, Regen
Servo
89.0
20.0
Second motor
parameter
Open-loop, Closed-loop vector, Servo,
Regen
Pr
21.16
Update rate
Background read
4.16
Thermal protection mode
Drive modes
Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit
SP
FI
DE
Txt VM DP
ND
RA NC NV
PT
US RW BU
PS
1
1
1
1
Range
Open-loop, Closed-loop vector, Servo,
Regen
0 to 1
Default
Open-loop, Closed-loop vector, Servo,
Regen
0
Update rate
Background read
I /(K*Motor Rated Current)
2
2
Temp
C
R
Summary of Contents for unidrive sp
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