Parameter Ranges And Variable Maximums - Emerson Mentor MP Advanced User's Manual

Parameter structure Keypad and 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,
• 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
MAX_SPEED_REF
[10000.0rpm]
SPEED_LIMIT_MAX
[10000.0rpm]
SPEED_MAX
[10000.0rpm]
MAX_RAMP_RATE
MAX_RAMP_RATE_M2
[3200.000]
RATED_CURRENT_MAX
[9999.99A]
DRIVE_CURRENT_MAX
[9999.99A]
MOTOR1_CURRENT_LIMIT_MAX
[1000.0%]
MOTOR2_CURRENT_LIMIT_MAX
[1000.0%]
TORQUE_PROD_CURRENT_MAX
[1000.0%]
USER_CURRENT_MAX
[1000.0%]
ARMATURE_VOLTAGE_MAX
[1025]
18
Parameter description
Parameter x.00
format
Maximum speed reference
If Pr 1.08 = 0: MAX_SPEED_REF = Pr 1.06 (SE02, 0.23)
If Pr 1.08 = 1: MAX_SPEED_REF is Pr 1.06 (SE02, 0.23) or – Pr 1.07 (SE01, 0.22) whichever is the largest
(If the second motor map is selected Pr 21.01 is used instead of Pr 1.06 (SE02, 0.23) and Pr 21.02 instead of
Pr 1.07 (SE01, 0.22))
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. The maximum is defined by
SPEED_LIMIT_MAX (in rpm) = 500kHz x 60 / ELPR = 3.0 x 10
10,000 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
This maximum is defined by the device selected with the speed feedback selector (Pr 3.26 (Fb01, 0.71)) and
the ELPR set for the position feedback device.
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 MAX_SPEED_REF
Maximum ramp rate
If (Pr 1.06 (SE02, 0.23) [Pr 21.01] >= 1000 and Pr 2.39 = 0) or Pr 2.39 >= 1000 then
MAX_RAMP_RATE = 3200.000
Else if Pr 2.39 = 0
MAX_RAMP_RATE = 3200 * Pr 1.06 (SE02, 0.23) [Pr 21.01] / 1000.0
Else
MAX_RAMP_RATE = 3200 * Pr 2.39 / 1000.0
End if
Maximum motor rated current
Maximum drive current
The maximum drive current is the current at the over current trip level and is given by:
DRIVE_CURRENT_MAX = RATED_CURRENT_MAX x 2
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 Menu 4 for the definition.
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 Menu 4 for the definition.
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.
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
Maximum armature voltage
Vac x 1.35 (√2 x 3 / π)
480 +10% drive: 720
575 +10% drive: 860
690 +10% drive: 1025
NOTE
For 4 quadrant drives maximum armature voltage = Vac x 1.15
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Definition
7
/ ELPR subject to an absolute maximum of
Mentor MP Advanced User Guide
Performance
Issue Number: 1