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Appendix A—Description of parameters
VARIABLE SPEED DRIVE SERIES III LIT-12012999—June 2018 www.johnsoncontrols.com
Code Modbus ID Parameter Application RO/RW
P5.1.10 288 Switching Frequency 1,2,3 RW
This parameter sets the frequency that the PWM wave rides on, higher switching frequency will be
cleaner the output sine wave, lower switching frequency will be a choppier sine wave. Motor noise can
be minimized using a high switching frequency but the amount of heat dissipation increases. Increasing
the switching frequency reduces the capacity of the frequency converter unit.
For protection against thermal overload, the switching frequency automatically is reduce in the fact that
the ambient temperature is high as well as high load currents.
Note: See Installation Manual for the values listed for the individual frame size switching frequency
ranges. It also provides de-rating tables required for sizing.
P5.1.11 1665 Sine Filter Enable 1,2,3 RW
This parameter is used when a sine filter is connected to the output motor leads, the parameter is used
to lock in the thermal management controls to not decrease the Switching frequency.
P5.1.12 294 OverVoltage Control 1,2,3 RW
This parameters allow the overvoltage controllers to be switched out of operation. This may be useful,
for example, if the main supply voltage varies more than –15% to +10% and the application will not
tolerate this overvoltage. In this case, the regulator controls the output frequency taking the supply
fluctuations into account.
0 = Controller switched off
1 = Controller switched on
P5.1.13 298 Load Drooping 3 RW
This parameter is used to enable speed drop as a function of the load, used to share loads between
mechnically coupled motors. This parameter corresponds to the nominal torque of the motor.
Example: If load drooping is set to 10% for a motor that has a nominal frequency of 50Hz and is
nominally loaded (100% of torque) the output frequency is allowed to decrease 5Hz from the
frequency reference. The function is used for e.g. when balanced load is needed for mechanically
connected motors.
P5.1.14 1630 Droop Control Filter Time Constant 3 RW
Filter time when using droop control
P5.2.1 577 Motor Nom Current 2 2,3 RW
Use this parameter to set the second motor set name plate Current. Selected based off of a digital input.
P5.2.2 578 Motor Nom Speed 2 2,3 RW
Use this parameter to set the second motor set name plate RPM. Selected based off of a digital input.
P5.2.3 579 Motor PF 2 2,3 RW
Use this parameter to set the second motor set name plate Power Factor. Selected based off of a
digital input.
P5.2.4 580 Motor Nom Volt 2 2,3 RW
Use this parameter to set the second motor set name plate Voltage. Selected based off of a
digital input.
P5.2.5 581 Motor Nom Freq 2 2,3 RW
Use this parameter to set the second motor set name plate Frequency. Selected based off of a
digital input.
P6.1.1 308 Output Phase Fault 1,2,3 RW
Use this parameter to set the device reaction to a “Phase Loss Output” condition. This failure could be
device dependent.
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to standard stop mode
3 = Fault, stop mode after fault always by coasting
P6.1.2 309 Ground Fault 1,2,3 RW
Use this parameter to set the device reaction to a “Ground Fault U-V-W” fault condition. This failure
could be device dependent. The level of fault occurs is based off the total drive current and the
Para ID2158.
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to standard stop mode
3 = Fault, stop mode after fault always by coasting
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