Rockwell Automation Publication 8720MC-RM001K-EN-P - September 2018
95
Configure Parameters
Chapter 7
F.015 Wattage of Precharge/Discharge Resistor
This parameter sets the rated
wattage of the precharge/
discharge resistor.
IMPORTANT:
This parameter is
available from software version
3.00 or later (to be shown on
the parameter F.018).
Parameter Range
50 to 2,000 W
Default Setting
• 120 W:
For catalog numbers 8720MC-RPS065
• 400 W:
For catalog numbers 8720MC-RPS190
Parameter Type
Requiring the password, configurable only while the unit is normal and stops.
Refer also to Parameters
F.014 Precharge/Discharge Time
When an external resistor for precharge/discharge or an external circuit is used, set again the Precharge/Discharge Time, if necessary. For
connection of the external resistor for precharge/discharge or the external circuit, refer to
on
and
on
The 8720MC-RPS unit has an overload protection function for precharge/discharge resistor. When the resistor becomes overload condition as a
result of repeated precharge and discharge, an overload error of the precharge/discharge resistor occurs.
The standard indication of overload of the precharge/discharge resistor is as follows:
Temperature increase of resistor:
•
Temp
. Increase of Resistor (degree C) = 500 x Precharge/Discharge Time (F.014)
• Wattage of Precharge/Discharge Resistor
•
Temp
. of Resistor to Detect Overload = 120 °C (248 °F)
When the temperature of the precharge/discharge resistor reaches 120 °C (248 °F), an overload error of the resistor occurs. But if precharge/
discharge operation is not performed for 10 minutes, the integrated values are cleared.
F.016 DC-bus Voltage Feedback Coefficient
This parameter is used to
compensate error of monitored
DC-bus voltage from actual
value, by multiplying the
feedback of DC-bus voltage by
coefficient.
IMPORTANT:
This parameter is
available from software version
2.00 or later (to be shown on
the parameter F.018).
IMPORTANT:
If the Unit type
selection (F.001) is changed,
F.016 returns to the factory
default setting (1,000). It needs
to be set again.
Parameter Range
0.900…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
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
(1)
/ DC-bus Voltage Reference (U.000)
After setting this parameter, confirm that the error was reduced.
(1) Measured DC-bus Voltage is value actually measured by a voltmeter.
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.