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6 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 9
3 Parameter description format
3.1 Software variable maximum term definitions
Table 3-1
The values given in square brackets indicate the maximum value allowed for the variable maximum. The term 'rated drive current' is the value used
by the software as rated current, which is not always the same as the drive rating specified in Pr 11.32 (see section 10.5 Menu 4: Current control ).
Maximum Definition
FREQ_MAX
[550 Hz]
Maximum frequency reference
FREQ_MAX = Pr 1.06
(If the second motor map is selected Pr 21.01 is used instead of Pr 1.06)
RATED_CURRENT_MAX
[999.9A]
Maximum motor rated current
RATED_CURRENT_MAX ≤ 1.36 x Rated drive current
On drives that offer dual rating, the rated current can be increased above the rated drive current up to a
level not exceeding 1.36 x drive rated current. The actual level varies from one drive size to another.
DRIVE_CURRENT_MAX
[999.9A]
Maximum drive current
The maximum drive current is the current at the over current trip level and is given by:
DRIVE_CURRENT_MAX = rated drive current x 2
MOTOR1_CURRENT_LIMIT_MAX
[999.9%]
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. See introduction to section 10.5 Menu 4: Current control for the definition.
MOTOR2_CURRENT_LIMIT_MAX
[999.9%]
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. See introduction to section 10.5 Menu 4: Current control for the definition.
TORQUE_PROD_CURRENT_MAX
[999.9%]
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
[999.9%]
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
CURRENT_LIMIT_MAX.
USER_CURRENT_MAX = Pr 4.24
AC_VOLTAGE_SET_MAX
[690V]
Maximum output voltage set-point
Defines the maximum motor voltage that can be selected.
110V drives: 240V
200V drives: 240V
400V drives: 480V
575V drives: 575V
690V drives: 690V
AC_VOLTAGE_MAX
[886V]
Maximum AC output voltage
This maximum has been chosen to allow for maximum AC voltage that can be produced by the drive
including trapizoidal operation:
AC_VOLTAGE_MAX = 0.7446 x DC_VOLTAGE_MAX
110V drives: 309V
200V drives: 309V
400V drives: 618V
575V drives: 741V
690V drives: 886V
DC_VOLTAGE_SET_MAX
[1150V]
Maximum DC voltage set-point
110V rating drive: 0 to 400V
200V rating drive: 0 to 400V
400V rating drive: 0 to 800V
575V rating drive: 0 to 950V
690V rating drive: 0 to 1150V
DC_VOLTAGE_MAX
[1190V]
Maximum DC bus voltage
The maximum measurable DC bus voltage.
110V drives: 415V
200V drives: 415V
400V drives: 830V
575V drives: 995V
690V drives: 1190V
POWER_MAX
[999.9kW]
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
POWER_MAX = √3 x AC_VOLTAGE_MAX x RATED_CURRENT_MAX x 2
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