Baldor mn722 manual Converter Section Troubleshooting, Gnd Flt

Table 5-3 Converter Section Troubleshooting

INDICATION	POSSIBLE CAUSE	CORRECTIVE ACTION
Current Sense FLT	Open circuit between control board	Check control wires between control board and current feedback sensor.
	and current sensor or defective
	current sensor.
DC Bus High	Incorrect setting of converter bridge	Check Bus Capacitance value of converter section parameters.
	parameter.
	Decel rate too fast.	Increase Decel time parameter setting.
DC Bus Low	Input voltage too low.	Monitor power line fluctuations with date and time imprint
		to isolate power problem.
		Check power line disturbances (sags caused by start up of
		other equipment).
		Use step up isolation transformer if needed.
GND FLT	Improper wiring.	Disconnect wiring between control and motor. Retry test.
		If GND FLT is cleared, reconnect motor leads and retry the test.
		Rewire as necessary.
		Repair motor.
		If GND FLT remains, contact Baldor.
High INIT CUR	Incorrect phasing between input	Check connections for proper phasing as detailed in Section 3 of this
	power, filter assembly and line	manual.
	reactors.
ID:No Feedback	Control board is installed on wrong	Change power base to one that has current feedback sensors.
	power base.
INT Over-Temp	Ambient temperature too high.	Relocate control to a cooler area. Add cooling fans or air condition the
		cabinet.
	Drive overloaded.	Verify proper sizing of control and motor. Correct loading of motor.
	Cooling fans or air path is clogged.	Clean fans and air path.
		Ensure fans are operating.
Invalid Base ID	Control does not recognize	Press “RESET” key on keypad. If fault remains, call Baldor.
	converter power base.
Logic Supply FLT	Power supply malfunctioned.	Replace logic power supply.
Lost AB Phase	Wire disconnected or phase lost.	Check for input power on all 3 phases.
		Check wiring and correct errors in all output wiring and wiring between
		individual components on EK type controls. Press “RESET” key on
		keypad. If fault remains, call Baldor.
Lost BC Phase	Wire disconnected or phase lost.	Check for input power on all 3 phases.
		Check wiring and correct errors in all output wiring and wiring between
		individual components on EK type controls. Press “RESET” key on
		keypad. If fault remains, call Baldor.
Lost User Data	Battery backed memory failure.	Parameter data was erased. Disconnect power to control and
		apply power (cycle power). Enter all parameters.
		Cycle power. If problem persists, contact Baldor.
Low INIT Bus V	Improper AC line voltage.	Check input AC voltage level.
Memory Error	EEPROM memory fault occurred.	Press “RESET” key on keypad. If fault remains, call Baldor.
mP Reset	Power was cycled before Bus	Press “RESET” key on keypad.
	voltage reached 0VDC.	Disconnect power and allow at least 5 minutes for
		Bus capacitors to discharge before applying power.
		If fault remains, call Baldor.
New Base ID	Software parameters are not	Press “RESET” key on keypad to clear the fault condition. Cycle power
	initialized on newly installed	(turn power OFF then ON). Refer to Section 4 and initialize new software.
	control board.	Access diagnostics and compare power base ID number to list in Table
		5-5 to ensure a match. Re-enter the Parameter Block Values you
		recorded in the User Settings at the end of this manual. Autotune the
		control. If fault remains, call Baldor.
	Continued on next page.
MN722		Troubleshooting 5-7