Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018
93
Configure Parameters
Chapter 7
F.010 Carrier Frequency
This parameter sets the carrier
frequency of the PWM
switching.
IMPORTANT:
This parameter is
available from software version
3.00 or later (to be shown on
the parameter F.018).
Parameter Range
5 kHz, 10 kHz, or 15 kHz
Default Setting
• 10 kHz: For catalog number 8720MC-RPS065
• 5 kHz: For catalog number 8720MC-RPS190
Parameter Type
Requiring the password, configurable only while the unit stops.
Refer also to Parameters
F.002
Rated Current
The carrier frequency is largely concerned with heat generation of the 8720MC-RPS unit and line reactor. When the carrier frequency is
increased from 10 kHz to 15 kHz, use the unit by derating the Rated Current (F.002) by 20%.
ATTENTION:
Only qualified electrical personnel familiar with the construction and operation of
this equipment and the hazards involved should change the Factory Parameters. Read and
understand this instruction manual in its entirety before proceeding. Failure to change
parameter values could result in destruction of the equipment, severe bodily injury or loss of life.
F.011 Deadtime
This parameter sets the
deadtime of PWM.
For most applications, we
recommend that this parameter
not be adjusted.
Parameter Range
1.5…15.0 μs
Default Setting
6.0 μs
Parameter Type
Requiring the password, configurable only while the unit is normal and stops.
Refer also to Parameters
–
Deadtime is the time provided for protecting the power modules from shorting. The set value depends on the transistor modules that are used
for the power modules. The Deadtime value is critical to proper operation. If you need to change the setting of this parameter, contact your local
Rockwell Automation sales representative.
ATTENTION:
Only qualified electrical personnel familiar with the construction and operation of
this equipment and the hazards involved should change the Factory Parameters. Read and
understand this instruction manual in its entirety before proceeding. Failure to change
parameter values could result in destruction of the equipment, severe bodily injury or loss of life.
F.012 Allowable Time for Instantaneous Power Loss
This parameter sets the time
period within which that the
8720MC-RPS unit can return to
operation automatically, when
the input power voltage drops
below 200V AC (for 460V units)
instantaneously, or when
instantaneous phase loss
occurred.
When the power dip or phase
loss continued longer than the
set value, a phase loss error
occurs.
Parameter Range
0.05…3.00 seconds
Default Setting
0.50 seconds
Parameter Type
Requiring the password, configurable only while the unit is normal and stops.
Refer also to Parameters
–
If an instantaneous power loss or phase loss is detected, the PWM switching stops. When the unit returns from the instantaneous power loss or
phase loss, the PWM switching restarts.
When the power to the main magnetic contactor was turned OFF due to an instantaneous power loss or phase loss and the main power supply
was turned OFF, returning from the instantaneous power loss or phase loss starts precharge operation. After the precharge operation is
completed, the PWM switching restarts.
When an instantaneous power loss or phase loss continued longer than the value set to this parameter, it is considered as a power loss, and a
phase loss error occurs. Detecting a phase loss error starts discharge operation.