Section 1
General Information

4-18 Programming & Operation MN715

Table 4-2 Parameter Block Definitions Level 2
Block Title PARAMETER Description
OUTPUT LIMITS Operating Zone The PWM operating zone; Standard 2.5kHz or Quiet 8.0kHz.
Two operating modes are also selectable: Constant Torque and Variable Torque.
Constant Torque allows 170 - 200% overload for 3 seconds and 150% overload for 60
seconds. Variable Torque allows 115% peak overload for 60 seconds.
MIN Output
Frequency The minimum output frequency to the motor. The scaling of an external speed
command signal will also be affected to the extent that a minimum speed command
will represent the minimum output frequency. During operation the output frequency
will not be allowed to go below this minimum output frequency (unless the motor is
starting from 0Hz or is ramped (regen) to a stop).
MAX Output
Frequency The maximum output frequency to the motor. The scaling of an external speed
command signal will also be affected to the extent that a maximum speed command
will represent the maximum output frequency. The max output frequency may be
exceeded slightly if slip compensation is active.
PK Current Limit The maximum output (peak) current to the motor. Values above 100% of the rated
current may be available depending upon the operating zone selected.
PWM Frequency
REGEN Limit
REGEN Limit ADJ
The frequency that the output transistors are switched. PWM should be as low as
possible to minimize stress on the output transistors and motor windings. PWM
frequency is also referred to as “Carrier” frequency.
Automatically increases the output frequency during REGEN periods for cyclic loads.
The output frequency will increase at the rate set by REGEN Limit ADJ but will not
exceed the Level 2, Output Limits “MAX Output Frequency” parameter value.
The amount of automatic frequency adjustment that occurs when REGEN Limit is turned
ON. Set as a change of hertz per second. Represents the ramp rate of the output
frequency during periods of motoring and overhauling (regen).
CUSTOM UNITS Max Decimal
Places
Value At Speed
Value DEC Places
Value Speed REF
Units of Measure
Units of MEAS 2
The number of decimal places of the Output Rate display on the Keypad display. This
value will be automatically reduced for large values. The output rate display is only
available if the “Value At Speed” parameter value is non-zero.
Sets the desired output rate value per motor RPM. Two numbers are displayed on the
keypad display (separated by a slash “/”). The first number (left most) is the value you
want the keypad to display at a specific motor speed (second number, right most). A
decimal may be inserted into the numbers by placing the flashing cursor over the
up/down arrow.
Serial Only. *
Serial Only. *
Allows you to specify units of measure to be displayed on the Output Rate display. Use
the shift and arrow keys to scroll to the first and successive characters. If the
character you want is not displayed, move the flashing cursor over the special
up/down character arrow on the left side of the display. Use the up/down arrows and
the shift key to scroll through all 9 character sets. Use the ENTER key to save your
selection.
Serial Only. *
* Note: Serial Commands. When using the serial command option, the “Value AT Speed”, “Value DEC Places”, and “Value Speed
REF” parameters must be set. The Value AT Speed parameter sets the desired output rate per increment of motor speed.
The Value DEC Places sets the desired number of decimal places of the Value AT Speed number. The Value Speed REF
sets the increment of motor speed for the desired output rate.
The Units of Measure parameter sets the two left-most characters of the custom units display while the Units of MEAS 2
parameter sets the two right most characters. For example, if “ABCD” is the custom units, “AB” is set in the Level 2 Custom
Units block, Units of Measure parameter and “CD” is set in the Level 2 Custom Units block, Units of MEAS 2 parameter.
Note: Custom Display Units. The output rate display is only available if the Value AT Speed parameter has been changed from a
value of 0 (zero). To access the Output Rate display, use the DISP key to scroll to the Output Rate display.