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Unidrive SP Advanced User Guide 19
Issue Number: 7 www.controltechniques.com
MOTOR1_CURRENT_LIMIT_MAX
[1000.0%]
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
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
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
Where:
Maximum current is drive rated current (Pr 11.32) x 1.75
Motor rated current is given by Pr 5.07
MOTOR2_CURRENT_LIMIT_MAX
[1000.0%]
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.
TORQUE_PROD_CURRENT_MAX
[1000.0%]
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.
USER_CURRENT_MAX
[1000.0%]
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
REGEN_REACTIVE_MAX
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.
Where:
Rated drive current is given in Table 5-3 on page 78.
Regen unit rated current is given by Pr 5.07
AC_VOLTAGE_SET_MAX
[690V]
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
Maximum Definition
Maximum
current limit
[[
Maximum current
]
2
+ PF
2
- 1
]
x 100%= Motor rated current
PF
Maximum
current limit
√[[
Maximum current
]
2
+ cos(ϕ
1
)
2
- 1
]
x 100%
= Motor rated current
cos(ϕ
1
)
Maximum
current limit
=
[
Maximum current
]
x 100%
Motor rated current
REGEN_REACTIVE_MAX
Rated drive current 1.75×
Regen unit rated current
-------------------------------------------------------------------------
2
Pr 4.07
2
–
100%×=
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