Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 102)

ATTENTION: Only qualified electrical personnel familiar with the construction and operation
of this equipment and the hazards involved should change this parameter. 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.
The deadtime is the time provided for protecting the power modules from shorting. Therefore, the set value
depends on the transistor modules to be used for the power modules. Careless change of the deadtime
might damage the unit. If you need to change the setting of this parameter, contact the Allen-Bradley
Company.
Parameter Range: 5 kHz, 10 kHz, or 15 kHz
Default Setting: 10 kHz: For Model 8720MC-RPS027 and 8720MC-RPS065
5 kHz: For Model 8720MC-RPS190
Parameter Type: Requiring the password, configurable only when the unit is normal
Refer also to Parameters: F.002 Rated Current
7-10 Parameters
F.010 Carrier Frequency (Note 1)
This parameter sets the
carrier frequency of the
PWM switching.
Note 1: This parameter is
available from software
version 3.00 (to be shown
on the parameter F.018) or
later only.
ATTENTION: Only qualified electrical personnel familiar with the construction and
operation of this equipment and the hazards involved should change this parameter.
Read and understand this 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.
The carrier frequency is largely concerned with heat generation of the 8720MC-RPS Regenerative Power
Supply and the 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%.
!
F.011 Deadtime
This parameter sets the
deadtime of PWM.
For most applications, it is
recommended that this
parameter not be adjusted.
Parameter Range: 1.5 to 15.0 microseconds
Default Setting: 6.0 microseconds
Parameter Type: Requiring the password, configurable only while the unit is normal and stops
Refer also to Parameters: N/A
!
F.012 Allowable Time for Instantaneous Power Loss
This parameter sets the
time period within which
the 8720MC-RPS
Regenerative Power
Supply can return to
operation automatically,
when the input power
voltage dropped (lower
than 200 VAC for 460 V
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 will be
detected.
Parameter Range: 0.05 to 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: N/A
If an instantaneous power loss or phase loss is detected, the PWM switching will stop. When the unit returns
from the instantaneous power loss or phase loss, the PWM switching will restart.
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 will start precharge operation. After the precharge operation is completed, the PWM switching
will restart.
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 will be detected. Detecting a phase loss error will start
discharge operation.