Safety
Information
Introduction
Product
information
System
design
Mechanical
installation
Electrical
installation
Getting
started
Optimisation
Parameters
Technical
data
Component
sizing
Diagnostics
92 Unidrive SP Regen Installation Guide
www.controltechniques.com Issue Number: 2
9 Parameters
9.1 Parameter ranges and variable maximums:
The two values provided define the minimum and maximum values for the given parameter. In some cases the parameter range is variable and
dependant on either:
• other parameters
• the drive rating
• drive mode
• or a combination of these
The values given in Table 9-1 are the variable maximums used in the drive.
Table 9-1 Definition of parameter ranges & variable maximums
Maximum Definition
RATED_CURRENT_MAX
[9999.99A]
Maximum motor rated current
RATED_CURRENT_MAX = 1.36 x Rated drive current.
The rated current can be increased above the Regen drive rated current up to a level not exceeding 1.36 x
Regen drive rated current. (Maximum rated current is the maximum Normal Duty current rating.)
The actual level varies from one drive size to another, refer to Table 3-2 on page 14.
DRIVE_CURRENT_MAX
[9999.99A]
Maximum drive current
The maximum drive current is the current at the over current trip level and is given by:
DRIVE_CURRENT_MAX = Regen drive rated current / 0.45
CURRENT_LIMIT_MAX
[1000.0%]
Unidrive SP in regen mode operates in a reference frame that is aligned to the voltage at the drive terminals. As
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 rated
drive current. The drive can operate up to this level under normal conditions.
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%):
Where:
The Regen drive rated current is give by Pr 5.07
The maximum current is either 1.75 x rated drive current when the rated current set by Pr 5.07 is ≤maximum
Heavy Duty current rating, otherwise it is 1.1 x maximum rated current.
The rated active and rated magnetising 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 user autotuning 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.
Motor rated current is given by Pr 5.07
TORQUE_PROD_CURRENT_MAX
[1000.0%]
Maximum torque producing current
This is used as a maximum for the real current (active current) in a Regen drive.
USER_CURRENT_MAX
[1000.0%]
Current parameter limit selected by the user
The user can select a maximum for Pr 4.08 (reactive current reference) and Pr 4.20 (active current reference)
to give suitable scaling for analogue I/O with Pr 4.24. This maximum is subject to a limit of
MOTOR1_CURRENT_LIMIT_MAX. USER_CURRENT_MAX = Pr 4.24
DC_VOLTAGE_SET_MAX
[1150V]
Maximum DC voltage set-point
400V rating drive: 0 to 800V
DC_VOLTAGE_MAX
[1190V]
Maximum DC bus voltage
The maximum measurable DC bus voltage
400V drives: 830V
POWER_MAX
[9999.99kW]
Maximum power in kW
The maximum power has been chosen to allow for the maximum power that can be output by the drive with
maximum AC output voltage, maximum controlled current and unity power factor. Therefore:
Software V01.07.01 and earlier: POWER_MAX = √3 x AC_VOLTAGE_MAX x RATED_CURRENT x 1.75
Software V01.08.00 and later: POWER_MAX = √3 x AC_VOLTAGE_MAX x DRIVE_CURRENT_MAX
The values given in square brackets indicate the absolute maximum value allowed for the variable maximum.
CURRENT_LIMIT_MAX
Maximum current
Regen drive rated current
-------------------------------------------------------------------------
⎝⎠
⎛⎞
100%×=
REGEN_REACTIVE_MAX
Reactive drive current 1.75×
Regen drive rated current
---------------------------------------------------------------------------------
2
Pr 4.07
2
–
⎝⎠
⎛⎞
100%×=
To Next Page
Loading...