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18 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 7
4.1 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 4-1 are the variable maximums used in the
drive.
Table 4-1 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 400kHz. The maximum is defined by
SPEED_LIMIT_MAX (in rpm) = 400kHz x 60 / ELPR = 2.4x10
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.
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 Maximum Heavy Duty current rating (Pr 11.32)
The rated current can be increased above the rated drive current up to a level not exceeding 1.36 x Maximum
Heavy Duty current rating (Pr 11.32). The actual level varies from one drive size to another, refer to Table 4-2.
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 = Maximum Heavy Duty current rating (Pr 11.32) / 0.45
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