Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 103)

7-11 Parameters
Parameter Range: 100 to 8,000 micro-henry
Default Setting: 1,200 micro-henry: For Model 8720MC-RPS065BM and 8720MC-RPS065BS
units
850 micro-henry: For Model 8720MC-RPS027BM
400 micro-henry: For Model 8720MC-RPS190BM and 8720MC-RPS190BS
units
Parameter Type: Requiring the password, configurable only while the unit is normal and stops
Refer also to Parameters: F.003 Current Control Proportional Gain
F.004 Current Control Integral Gain
F.010 Carrier Frequency
F.013 AC Reactor Capacity (Note 1)
This parameter sets the
capacity of the AC reactor
installed in the main power
wiring.
Note 1: This parameter is
available from software
version No. 3.00 (to be
shown on the parameter
F.018) or later only
This parameter sets the capacity of the AC reactor in the unit of micro-henry. Note that the AC reactor
capacity set to the parameter is not the total capacity for three phases but the capacity for one phase only.
This is also applicable to multiple units connected in parallel.
Larger capacity of capacitors connected to the DC bus requires a longer precharge time. In such a case, set
a large value to this parameter.
When the DC bus voltage does not reach the precharge voltage even if the time period set to this parameter
has already elapsed, a precharge error will be detected. Set a larger value. (Remarks: The precharge
voltage is 90% of the peak value of the AC input power voltage.)
In case of precharge, the precharge operation will be finished when the DC bus voltage arrives at a certain
value, even though the set Precharge/Discharge Time has not elapsed yet. But in case of discharge, the
discharge operation continues for the set value of this parameter, regardless of the DC bus voltage.
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 Section 4.3 and 4.4.
F.014 Precharge/Discharge Time (Note 1)
This parameter sets the
precharge/discharge time.
If the DC bus voltage did
not go up in precharge
even if the set time period
has elapsed, a precharge
error will be detected. In
case of discharge, the
discharge operation will
continue for the time period
set to this
parameter.
Note 1: This parameter
must be set to 6.0 seconds
when 8720MC-RPS190
unit is used.
Parameter Range: 0.5 to 15.0 seconds
Default Setting: 3.0 seconds
Parameter Type: Requiring the password, configurable only while the unit is normal and stops
Refer also to Parameters: F.015 Wattage of Precharge/Discharge Resistor
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 Section 4.3 and 4.4.
The 8720MC-RPS Regenerative Power Supply 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 will be detected.
The standard indication of overload of the precharge/discharge resistor is as follows:
Temperature increase of resistor:
500 x Precharge/Discharge Time (F.014)
Wattage of Precharge/Discharge Resistor
Temp. of Resistor to Detect Overload = 120 degree C (248 degree F)
When the temperature of the precharge/discharge resistor reaches 120 degree C (248 degree F), an
overload error of the resistor will be detected. But if precharge/discharge operation is not performed for 10
minutes, the integrated values will be cleared.
Temp. Increase of Resistor (degree C) =
F.015 Wattage of Precharge/Discharge Resistor (Note 1)
This parameter sets the
rated wattage of the
precharge/discharge
resistor.
Note 1: This parameter is
available from software
version No. 3.00 (to be
shown on the parameter
F.018) or later only.
Parameter Range: 50 to 2,000 W
Default Setting: 120 W: For Model 8720MC-RPS065BM and 8720MC-RPS065BS units
80 W: For Model 8720MC-RPS027BM
400 W: For Model 8720MC-RPS190BM and 8720MC-RPS190BS units
Parameter Type: Requiring the password, configurable only while the unit is normal and stops
Refer also to Parameters: F.014 Precharge/Discharge Time