Rockwell Automation 8720MC 8720MC Regenerative Power Supply User Manual - Manual (Page 108)

The error codes are shown in tables 8.A to 8.D. Table 8.A shows
the error codes common to all units regardless of single unit
connection or parallel connection of multiple units. Table 8.B
shows the error codes caused by master unit (unit having Regulator
Board) regardless of single unit connection or parallel connection
of multiple units. Table 8.C shows the error codes caused by slave
unit 1 (slave unit adjacently connected to master unit) in case of
parallel connection of multiple units. Table 8.D shows the error
codes caused by slave unit 2 (slave unit adjacently connected to
slave unit 1) in case of parallel connection of multiple units.
To reset error codes, first remove the causes of the errors, and then
press the RST key or enter the RESET sequence signal. In either
case, resetting cannot be performed when the RUN sequence signal
has been entered.
Table 8.A
List of Error Codes Common to All 8720MC-RPS Regenerative Power Supply
Error
Code
PrC
CHr
oL
AC
HU
LU
Error
Description
Precharge Error
Precharge/
Discharge
Overload Error
Overload Error
AC Input
Frequency or
High Voltage
Error
High Bus Voltage
Low Bus Voltage
Error
Error Cause
The DC bus voltage did not reach a
certain level in precharge even if the
precharge/discharge time has
elapsed.
The precharge/discharge resistor is in
overload condition.
Output current is excessive.
The AC input power frequency
exceeds the base frequency (50 Hz
or 60 Hz) by +/-3% or more.
There is large distortion (notches) in
AC input power voltage.
The AC input power is too high.
The DC bus voltage is too high.
The DC bus voltage is too low.
Corrective Action
Check that the set value of the Precharge/ Discharge Time (F.014)
is correct. If no other problem is found, increase the set value.
Precharge/discharge resistor or its wiring is faulty. Check the
resistor and wiring, and remove the cause. If Fuse 1 the precharge
fuse is blown, replace the fuse. Check that the recommended line
reactor has been selected.
Do not perform precharge and discharge for a while.
Replace the precharge/discharge resistor with one having a larger
wattage, and set again the Wattage of Precharge/Discharge
Resistor (F.015).
Check that the power rating of the unit is adequate for the input of
the load.
Decrease the input of the load.
Check the AC input power supply.
Check that the set value of the AC Overvoltage Detection Level
(F.009) is adequate. If no other problem is found, increase the set
value.
Check the AC input power voltage.
Check that the set value of the Voltage Control Proportional Gain
(F.005) is adequate.
Check that the set value of the Bus Overvoltage Detection Level
(F.007) is adequate. If no other problem is found, increase the set
value.
The capacity of the AC reactor is too large. Replace it with a
reactor having a smaller capacity.
The load change is too fast. Reduce the load change speed.
Check the AC input power voltage and the line fuse.
Check that the set value of the Allowable Time for Instantaneous
Power Loss (F.012) is adequate. If no other problem is found,
increase the set value.
8-2 Error Codes and Warning Buzzer
Contents of Error Codes
and Recovering