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162 Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
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 13-4 are the variable maximums used in the
drive.
Table 13-4 Definition of parameter ranges & variable maximums
Maximum Definition
SPEED_FREQ_MAX
[Open-loop 3000.0Hz,
Closed-loop vector and Servo
40000.0rpm]
Maximum speed (closed-loop mode) reference or frequency (open-loop mode) reference
If Pr 1.08 = 0: SPEED_FREQ_MAX = Pr 1.06
If Pr 1.08 = 1: SPEED_FREQ_MAX is Pr 1.06 or – Pr 1.07 whichever is the largest
(If the second motor map is selected Pr 21.01 is used instead of Pr 1.06 and Pr 21.02 instead of Pr 1.07)
SPEED_LIMIT_MAX
[40000.0rpm]
Maximum applied to speed reference limits
A maximum limit may be applied to the speed reference to prevent the nominal encoder frequency from
exceeding 500kHz (410kHz for software version V01.06.00 and earlier). The maximum is defined by
SPEED_LIMIT_MAX (in rpm) = 500kHz x 60 / ELPR = 3.0 x 10
7
/ ELPR subject to an absolute maximum of
40,000 rpm.
ELPR is equivalent encoder lines per revolution and is the number of lines that would be produced by a
quadrature encoder.
Quadrature encoder ELPR = number of lines per revolution
F and D encoder ELPR = number of lines per revolution / 2
Resolver ELPR = resolution / 4
SINCOS encoder ELPR = number of sine waves per revolution
Serial comms encoder ELPR = resolution / 4
This maximum is defined by the device selected with the speed feedback selector (Pr 3.26) and the ELPR set
for the position feedback device.
In closed-loop vector RFC mode SPEED_LIMIT_MAX = 40,000rpm.
SPEED_MAX
[40000.0rpm]
Maximum speed
This maximum is used for some speed related parameters in menu 3. To allow headroom for overshoot etc. the
maximum speed is twice the maximum speed reference.
SPEED_MAX = 2 x SPEED_FREQ_MAX
RATED_CURRENT_MAX
[9999.99A]
Maximum motor rated current
RATED_CURRENT_MAX = 1.36 x K
C
.
The motor rated current can be increased above K
C
up to a level not exceeding 1.36 x K
C
). (Maximum motor
rated current is the maximum normal duty current rating.)
The actual level varies from one drive size to another, refer to Table 13-5.
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 = K
C
/ 0.45
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
AC_VOLTAGE_MAX
[930V]
Maximum AC output voltage
This maximum has been chosen to allow for maximum AC voltage that can be produced by the drive including
quasi-square wave operation as follows:
AC_VOLTAGE_MAX = 0.78 x DC_VOLTAGE_MAX
200V drives: 325V, 400V drives: 650V, 575V drives: 780V, 690V drives: 930V
DC_VOLTAGE_SET_MAX
[1150V]
Maximum DC voltage set-point
200V rating drive: 0 to 400V, 400V rating drive: 0 to 800V
575V rating drive: 0 to 955V, 690V rating drive: 0 to 1150V
DC_VOLTAGE_MAX
[1190V]
Maximum DC bus voltage
The maximum measurable DC bus voltage.
200V drives: 415V, 400V drives: 830V, 575V drives: 990V, 690V drives: 1190V
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