Parameter Ranges And Variable Maximums; Definition Of Parameter Ranges & Variable Maximums - Emerson unidrive sp User Manual

Parameter Keypad and
Parameter x.00
structure display
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
SPEED_FREQ_MAX
[Open-loop 3000.0Hz,
Closed-loop vector and Servo
40000.0rpm]
SPEED_LIMIT_MAX
[40000.0rpm]
SPEED_MAX
[40000.0rpm]
RATED_CURRENT_MAX
[9999.99A]
DRIVE_CURRENT_MAX
[9999.99A]
Unidrive SP Advanced User Guide
Issue Number: 10
Parameter Advanced parameter
description format descriptions
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)
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 = 3.0x10
40,000 rpm. It should be noted that this limit makes no allowance for controller overshoot, and that the
maximum encoder frequency should not exceed 500kHz even under overshoot conditions.
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. If a resolver is used as speed feedback from a Solutions Module the
calculation is different (see Pr 15/16/17.10 for the SM-Resolver module). With closed-loop vector mode it is
possible to disable this limit via parameter Pr 3.24, so that the drive can be switched between operation with
and without feedback when the speed becomes too high for the feedback device. SPEED_LIMIT_MAX is
defined as above when Pr 3.24 = 0 or 1, and is 40,000rpm when Pr 3.24 = 2 or 3.
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
Maximum motor rated current or maximum normal duty current rating
RATED_CURRENT_MAX ≤ 1.36 x Kc
The rated current can be increased above the current scaling level (Kc) up to a level not exceeding 1.36 x Kc.
The actual level varies from one drive size to another. (Maximum motor rated current is the maximum normal
duty current rating). Refer to Table 4-2
Maximum drive current
The maximum drive current is the current at the over current trip level and is given by:
DRIVE_CURRENT_MAX = Kc / 0.45
where Kc is the current scaling factor
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Serial comms Electronic
Macros
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Definition
7
/ ELPR subject to an absolute maximum of
Performance RFC mode
19