Control Techniques unidrive sp Advanced User's Manual page 20

Parameter Keypad and
Parameter x.00
structure display
Maximum
MOTOR1_CURRENT_LIMIT_MAX
[1000.0%]
MOTOR2_CURRENT_LIMIT_MAX
[1000.0%]
TORQUE_PROD_CURRENT_MAX
[1000.0%]
USER_CURRENT_MAX
[1000.0%]
REGEN_REACTIVE_MAX
AC_VOLTAGE_SET_MAX
[690V]
Unidrive SP Advanced User Guide
Issue Number: 7
Parameter Advanced parameter
description format descriptions
Maximum current limit settings for motor map 1
This maximum current limit setting is the maximum applied to the current limit parameters in motor map 1.
Open Loop
√[
[
Maximum current
Maximum
= Motor rated current
current limit
Where:
The Maximum current is either (1.5 x Heavy Duty rating) when the rated current set in Pr 5.07 is less than or
equal to the maximum Heavy Duty current rating given by Pr 11.32, otherwise it is (1.1 x Normal Duty rating).
Motor rated current is given by Pr 5.07
PF is motor rated power factor given by Pr 5.10
Closed Loop Vector
√[
[
Maximum current
Maximum
= Motor rated current
current limit
Where:
The Maximum current is either (1.75 x Heavy Duty rating) when the rated current set in Pr 5.07 is less than or
equal to the maximum Heavy Duty current rating given by Pr 11.32, otherwise it is (1.1 x Normal Duty rating).
Motor rated current is given by Pr 5.07
ϕ1 = cos-1(PF) - ϕ2. This is measured by the drive during an autotune. See section Closed-loop vector on
page 82 for more information regarding ϕ2.
PF is motor rated power factor given by Pr 5.10
Servo
[
Maximum current
Maximum
=
current limit
Motor rated current
Where:
Maximum current is drive rated current (Pr 11.32) x 1.75
Motor rated current is given by Pr 5.07
Maximum current limit settings for motor map 2
This maximum current limit setting is the maximum applied to the current limit parameters in motor map 2.
The formulae for MOTOR2_CURRENT_LIMIT_MAX are the same for MOTOR1_CURRENT_LIMIT_MAX
except that Pr 5.07 is replaced with Pr 21.07 and Pr 5.10 is replaced with Pr 21.10.
Maximum torque producing current
This is used as a maximum for torque and torque producing current parameters. It is
MOTOR1_CURRENT_LIMIT_MAX or MOTOR2_CURRENT_LIMIT_MAX depending on which motor map is
currently active.
Current parameter limit selected by the user
The user can select a maximum for Pr 4.08 (torque reference) and Pr 4.20 (percentage load) to give suitable
scaling for analog I/O with Pr 4.24. This maximum is subject to a limit of MOTOR1_CURRENT_LIMIT_MAX.
or MOTOR2_CURRENT_LIMIT_MAX depending on which motor map is currently active.
USER_CURRENT_MAX = Pr 4.24
Reactive current limit in regen mode
The drive applies a limit to the reactive current reference in regen mode to limit the total current to
DRIVE_CURRENT_MAX.
REGEN_REACTIVE_MAX =
Where:
Rated drive current is given in Table 5-3 on page 78.
Regen unit rated current is given by Pr 5.07
Maximum output voltage set-point
Defines the maximum motor voltage that can be selected.
200V drives: 240V, 400V drives: 480V
575V drives: 575V, 690V drives: 690V
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Serial comms
Macros
protocol
Definition
]
]
2
2
+ PF - 1
x 100%
PF
]
]
2
2
+ cos(ϕ ) - 1
1
cos(ϕ )
1
]
x 100%
2
×
Rated drive current 1.75
  
------------------------------------------------------------------------ -
  
Regen unit rated current
Electronic Feature look-
Performance
nameplate
x 100%

2
×
– Pr 4.07 100%

up table
19