Regen - Emerson unidrive sp User Manual
Universal variable speed ac drive for induction and servo motors
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Parameter
Keypad and
Menu 4
structure
display
Where:
Motor rated current is given by Pr 5.07
(MOTOR2_CURRENT_LIMIT_MAX is calculated from the motor map 2 parameters)
The Maximum current is either (1.75 x Kc) when the rated current set by Pr 5.07 (or Pr 21.07 if motor map 2 is selected) is less than or equal to
the maximum Heavy Duty current rating, otherwise it is (1.1 x Maximum Normal Duty rated current).
The rated active and rated magnetising currents are calculated from motor rated current (Pr 5.07) as:
rated active current = motor rated current
rated magnetising current = 0
In this mode the drive only requires the motor rated current to set the maximum current limit correctly and scale the current limits, and so no auto-
tuning is required to set these accurately.
5.6.4
Regen
In this mode the drive operates in a reference frame that is aligned to the voltage at the drive terminals. Because the phase shift across the input
inductors is small, the reference frame is approximately aligned with the supply voltage. The maximum normal operating current is controlled by the
current limits.
DRIVE_CURRENT_MAX is used in calculating the maximum of some parameters and is fixed at 1.75 x Kc. The drive can operate up to this level
under normal conditions.
The relationship between the voltage and current for Regen mode operation is shown in the following vector diagram.
Regen mode
wLi
sy
vs = Regen unit
terminal voltage
Supply
voltage
i
s
Definitions:
i
= regen drive terminal voltage vector
s
vs = regen drive current vector
CURRENT_LIMIT_MAX is used as the maximum for some parameters such as the user current limits. The maximum current limit is defined as
follows (with a maximum of 1000%):
CURRENT_LIMIT_MAX
=
Where:
Regen unit rated current is given by Pr 5.07
The Maximum current is either (1.75 x Kc) when the rated current set by Pr 5.07 (or Pr 21.07 if motor map 2 is selected) is less than or equal to
the maximum Heavy Duty current rating, otherwise it is (1.1 x Maximum Normal Duty rated current).
The rated active and rated magnetizing currents are calculated from regen mode rated current (Pr 5.07) as:
rated active current = regen mode rated current
rated magnetising current = 0
In this mode the drive only requires the regen mode rated current to set the maximum current limit correctly and scale the current limits, and so no
auto-tuning is required to set these accurately.
It is possible to set a level of reactive current with Pr 4.08 in regen mode. This parameter has a limit defined as REGEN_REACTIVE_MAX that is
provided to limit the total current to DRIVE_CURRENT_MAX.
REGEN_REACTIVE_MAX
92
Parameter
Parameter
x.00
description format
Maximum current
------------------------------------------------------ -
×
100%
Motor rated current
×
Kc
1.75
⎛
-------------------------------------------------------------------- -
=
⎝
Regen unit rated current
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Advanced parameter
Macros
descriptions
2
2
Pr 4.07
⎞
×
------------------ -
–
100%
⎠
100
Serial comms
Electronic
Performance RFC mode
protocol
nameplate
Unidrive SP Advanced User Guide
Issue Number: 10
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