Fuji Bikes 5000G11S/P11S F14 Restart mode after momentary power failure, Accident may result

U23, U24

Related functions:

F14 Restart mode after momentary power failure

‹This function selects operation if a momentary power failure occurs.

The function for detecting power failure and activating protective operation (i.e., alarm output, alarm display, inverter output cutoff) for undervoltage can be selected. The automatic restart function (for automatically restarting a coasting motor without stopping) when the supply voltage is recovered can also be selected.

‹When setting value is selected "2" or "3", both integration constant and the proportional constant during operation ride-though can be adjusted by the function code : U23 and U24. The details are referred to the function code : U23 and U24.

F 1 4 R

E S T A R T

Setting range: 0 to 5

The following table lists the function details.

Set	Function name			Operation at power failure		Operation at power recovery
value
０	Inactive			If undervoltage is detected, the drive will immediately trip and		The drive operation is not automatically
	(immediate inverter trip)			an undervoltage fault (LU) is displayed.	The drive output	restarted. Input a reset command and
				stops and the motor will coast to a stop.		operation command to restart operation.
１	Inactive			If undervoltage is detected, the drive output stops and the		An undervoltage fault (LU) is activated at
	(inverter trip at recovery)			motor will immediately coast to a stop. A drive fault is not		power recovery. Drive operation is not
				activated		automatically restarted. Input a reset
						command to restart operation.
２	Inactive			When the DC bus voltage reaches the continue operation		The drive operation is not automatically
	(inverter	trip	after	voltage level (H15), a controlled deceleration to a stop occurs.		restarted. Input a reset command and
	deceleration to a stop at			The inverter collects the inertia energy of the load to maintain		operation command to restart operation.
	power failure) Note1			the DC bus voltage and controls the motor until it stops, then
				an undervoltage fault (LU) is activated.
				The drive will automatically decrease the deceleration time if
				necessary. If the amount of inertia energy from the load is
				small, and the undervoltage level is achieved before the motor
				stops, the undervoltage fault is immediately activated and the
				motor will coast to a stop.
３	Active			When the DC bus voltage reaches the continue operation		Operation is automatically restarted.
	(operation	ride	through,	voltage level (H15), energy is collected from the inertia of the		For power recovery during ride-through the
	for high-inertia loads) Note1			load to maintain the DC bus voltage and extend the ride		drive will accelerate directly to the original
				through time. The drive will automatically adjust the		frequency. If undervoltage is detected,
				deceleration rate to maintain DC bus	voltage level. If	operation automatically restarts with the
				undervoltage is detected, the protective function is not		frequency at the time that the undervoltage
				activated, but drive output stops and the motor coast to a stop.		is detected.
４	Active			If undervoltage is detected, the protective function is not		Operation is automatically restarted with
	(restart	with	the	activated. The drive output stops and the motor will coast to a		the frequency at power failure.
	frequency	at	power	stop.
	failure) Note1
５	Active			If undervoltage is detected, the protective function is not		Operation is automatically restarted with
	(restart with the start			activated, but output stops.		the frequency set by F23, "Starting
	frequency, for low-inertia					frequency."
	loads) Note1

Note1) When the function code H18(Torque control) is excluding "0" and Motor 1 is selected, the inverter will trip at power recovery if function code F14 is set to between "2" and "5". This operation is same as F14 is set to "1".

Function codes H13 to H16 are provided to control a restarting operation after momentary power failure. These functions should be understood and used. The pick-up (speed search) function can also be selected as a method of restarting when power is recovered following a momentary failure. (For setting details, see function code H09.)

The pick-up function searches for the speed of the coasting motor to restart the motor without subjecting it to excessive shock. In a high-inertia system, the reduction in motor speed is minimal even when the motor is coasting. A speed searching time is required when the pick-up function is active. In such a case, the original frequency may be recovered sooner when the function is inactive and the operation restarted with the frequency prior to the momentary power failure.

The pick-up function works in the range of 5 to 100 Hz. If the detected speed is outside this range, restart the motor using the regular restart function.

WARNING

•Automatically restart could be provided at power recovered, if "Restart mode after momentary power failure" is valid.

•The machine should be designed to securing the human safe even restarting.

Accident may result.

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