Baldor mn722 manual Flt

Table 5-4 Inverter Section Troubleshooting Continued

INDICATION	POSSIBLE CAUSE	CORRECTIVE ACTION
New Base ID	Software parameters are not	Press “RESET” key on keypad to clear the fault condition. Reset
	initialized on newly installed	parameter values to factory settings. Access diagnostics and compare
	control board.	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.
No EXB Installed	Incorrect programmed parameter.	Change the Level 1 Input block, Command Select parameter and the Level
		2 Process Control block, Process Feedback and Setpoint Source
		parameters to a value that does not require an expansion board.
	Need expansion board.	Install the correct expansion board for selected operating mode.
Over Current FLT	Current Limit parameter set lower	Increase the Level 2 Output Limits block, PK Current Limit parameter.
	than drive rating.	Do not exceed drive rating.
	ACCEL/DECEL time too short.	Increase the Level 1 ACCEL/DECEL Rate block ACCEL/DEC parameters.
	Encoder coupling slipping, broken	Correct or replace encoder to motor coupling.
	or misaligned.
	Encoder bearing failure.	Replace encoder.
	Excessive noise on encoder lines.	Check the position counter in the Diagnostic Information for
		jittering which will confirm an encoder problem.
		Check encoder connections.
		Separate encoder leads from power wiring.
		Use Baldor encoder cable.
		Cross encoder wires and power leads at 90° .
		Electrically isolate encoder from motor.
		Install optional Isolated Encoder Feedback expansion board.
	Electrical noise from external DC	Install reverse biased diodes across all external DC relay coils as shown in
	coils.	the Opto Output circuit examples of this manual. See Electrical Noise
		Considerations in Section 5 of this manual.
	Electrical noise from external AC	Install RC snubbers on all external AC coils. See Electrical Noise
	coils.	Considerations in Section 5 of this manual.
	Excessive load.	Reduce the motor load.
		Verify proper sizing of control and motor.
Overload - 3 Sec	Peak output current exceeded 3	Check the Level 2 Output Limits block PK Current Limit parameter.
FLT	second rating.	Change the Level 2 Protection block Overload parameter from Trip to
		Foldback.
		Check motor for overloading.
		Increase Level 1 ACCEL/DECEL Rate block ACCEL/DEC parameters.
		Reduce motor load.
		Verify proper sizing of control and motor.
	Encoder coupling slipping, broken	Correct or replace encoder to motor coupling.
	or misaligned.
	Encoder bearing failure.	Replace encoder.
Overload - 1 Min	Peak output current exceeded 1	Verify proper motor data has been entered.
FLT	minute rating.	Check the Level 2 Output Limits block PK Current Limit parameter.
		Change the Level 2 Protection block Overload parameter from Trip to
		Foldback.
		Check motor for overloading.
		Increase Level 1 ACCEL/DECEL Rate block ACCEL/DEC parameters.
		Reduce motor load.
		Verify proper sizing of control and motor.
	Encoder coupling slipping, broken	Correct or replace encoder to motor coupling.
	or misaligned.
	Encoder bearing failure.	Replace encoder.
Over Speed	Motor exceeded 110% of MAX	Check the Level 2 Output Limits block Max Output Speed.
	Speed parameter value.	Increase the Level 1 Vector Control block Speed PROP Gain.
	Continued on next page.
5-12 Troubleshooting		MN722