Toshiba G7 manual Dynamic Braking Resistor, PtSt

EOI	Function	Description		Possible Causes
Display
*OLI	ASD Overload	Load requirement in excess of	•	The carrier frequency is too high.
		the capability of the ASD.	•	An excessive load.
			• Acceleration time is too short.
			• DC damping rate is set too high.
			• The motor is starting into a spinning load after a
				momentary power failure.
			• The ASD is improperly matched to the application.
OLM	Motor Overload	Load requirement in excess of	•	V/f parameter improperly set.
		the capability of the motor.	•	Motor is locked.
			• Continuous operation at low speed.
			• The load is in excess of what the motor can deliver.
*OLR	Resistor	Excessive current at the	•	Deceleration time is too short.
	Overload	Dynamic Braking Resistor.	• DBR configuration improperly set.
*OP	Overvoltage	DC bus voltage exceeds	•	ASD attempting to start into a spinning motor after a
		specifications.		momentary power loss.
			• Incoming utility power is above the specified range.
			• Decel time is too short.
			• Voltage spikes at the 3-phase input; install inductive
				filter.
			•	DBR required.
			• DBR resistance value is too high.
			• DBR function is turned off.
			• Overvoltage Stall feature is turned off.
			•	System is regenerating.
			•	Load instability.
			• Disable the Ridethrough function (F302).
OT	Overtorque	Torque requirement in excess of	•	ASD is not correctly matched to the application.
		the setting of F616 or F617 for a	•	F616 or F617 setting is too low.
		time longer than the setting of
		F618.	•	Obstructed load.
*POFF	Control	Undervoltage condition at the 5,	•	Defective Control board.
	Undervoltage	15, or the 24 VDC supply.	• Excessive load on power supply.
			•	Low input voltage.
PtSt	Reference Point	Two speed-reference frequency	•	Two speed reference frequency setpoints are too close to
		setpoint values are too close to		each other (increase the difference).
		each other.
UC	Undercurrent	Output current of the ASD is
		below the level defined at F611
		and remains there for the time
		set at F612.
* Reset ignored if active.

G7 ASD Operation Manual 175