Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 104)

7-12 Parameters
F.016 DC Bus Voltage Offset (Note 1)
This parameter is used to
compensate error of
monitored DC bus voltage
from actual value, by
multiplying feedback value
of DC bus voltage by offset
(gain).
Note 1: This parameter is
available from software
version No. 2.00 (to be
shown on the parameter
F.018) or later only.
Parameter Range: 0.900 to 1.100
Default Setting: 1.000
Parameter Type: Requiring the password, configurable only while the unit is normal
Refer also to Parameters: U.000 DC Bus Voltage Reference
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.
An error of monitored value of DC bus voltage shown on the display (usually almost same as the set value of
the DC Bus Voltage Reference (U.000) from actually measured DC bus voltage can be compensated by
setting an adequate value to this parameter.
The value to be set to the DC Bus Voltage Offset (F.016) is determined by using the following formula:
DC Bus Voltage Offset (F.016) = Measured DC Bus Voltage (*) / DC Bus Voltage Reference (U.000)
* Measured DC Bus Voltage is value actually measured by a voltmeter.
After setting this parameter, confirm that the error was reduced.
!
F.017 Discharging Function Enable (Note 1)
This parameter selects
whether the discharging
function of DC bus voltage
is performed or not, when
the 8720MC-RPS
Regenerative Power
Supply is stopped or
aborted. When "On" is
selected, DC bus voltage
will be discharged at
stopping the unit. If "OFF"
is set, DC bus voltage will
not be discharged.
Note 1: This parameter is
available from software
version No. 2.00 (to be
shown on the parameter
F.018) or later only.
Parameter Range: OFF, On
Default Setting: On
Parameter Type: Requiring the password, configurable only while the unit is normal
Refer also to Parameters: N/A
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.
ATTENTION: DC bus capacitors retain hazardous voltages after input power has been
disconnected. After disconnecting power, wait for a while for the DC bus capacitors to
discharge and then check the voltage with a voltmeter to ensure the DC bus capacitors are
discharged before touching any internal components. Failure to observe this precaution
could result in severe bodily injury or loss of life.
Setting this parameter to "OFF" will not discharge the DC bus voltage when the 8720MC-RPS Regenerative
Power Supply is stopped or aborted, resulting in retaining an almost same voltage as the set value of the DC
Bus Voltage Reference (U.000) in the DC bus capacitors. Exercise extreme care when this parameter is set
to "OFF".
When using by setting this parameter to "OFF",
1) When a GV3000/SE unit is connected to the 8720MC-RPS Regenerative Power Supply as load
equipment, set this parameter to "OFF", and perform discharging on the GV3000/SE unit side. In this
case, the discharging time is determined by the GV3000/SE unit.
2) When the 8720MC-RPS Regenerative Power Supply is used in the power regeneration mode (Figures
4.4 and 4.9), set this parameter to "OFF", and perform discharging on the inverter unit side. In this case,
the discharging time is determined by the Inverter unit to be connected.
!
!