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Unidrive SPM User Guide
163
Issue Number: 3 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 K
C
) when the motor 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 K
C
) when the motor 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
ϕ
1
= cos-1(PF) -
ϕ
2
. This is measured by the drive during an autotune. See Menu 4 in the
Advanced User
Guide
for more information regarding
ϕ
2.
PF is motor rated power factor given by Pr
5.10
Servo
Where:
The Maximum current is either (1.75 x K
C
) when the motor 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
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
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.
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