Toshiba VF-A7 Motor 150%-overload time limit , Inverter overload characteristic

2) Motor 150%-overload time limit



The motor 150%-overload time limit parameter  is used to set the time elapsed before the motor trips under a load of 150% (overload trip ) within a range of 10 to 2400 seconds.

				[Example: setting of ]
					Monitored output		Motor overload withstanding time [s]
			Operation frequency		current [%]			(Outline data)
							=		=
			no less than	
		Operation frequency			=	=	≦ [Hz] ≦ [Hz]
Motor overload		0.01	[Hz](*1)		68	34	－	7200	－	3600
					70	35	－	3600	－	1800
withstanding time [s]
					80	40	－	1000	－	500
					90	45	－	600	－	300
					100	50	－	420	－	210
					112	56	12000	310	6000	155
					120	60	2400	270	1200	135
					130	65	1200	230	600	115
					140	70	800	190	400	95
					150	75	600	170	300	85
Motor 150%-overload					200	100	270	110	135	55
time limit	
	0		×			Monitored output current [%]
			1.1

				×1.5	(*1) Except for the cases of
×0.6			
					＝,  [Hz]
Title		Function			Adjustment range	Default setting
	Motor 150%-overload time limit				 to  [s]	

3) Inverter overload characteristic

This function is provided to protect the inverter itself and it cannot be changed or disabled by changing any parameter setting.

If the inverter overload trip function () is activated frequently, this condition can be improved by changing the setting of the stall prevention level parameter  to a lower level or increasing the acceleration time  or the deceleration time .

Inverter overload withstanding time [s]

small/medium capacity types: 120 large capacity types: 60

０

Output	Inverter overload withstanding				time
	[s]	(Outline		data)
current
	200V:0.4～55kW		200V:75,90kW
[%]
	400V:0.75～75kW		400V:90/110～280kW
111	4800			2400
120	480			240
130	240			120
140	160			80
150	120			60
160	10			9
170	4			3
180	2			0.3
215	0.5			-

110 150 Monitored output current [%]

100%: Inverter's rated output current

＊If the load applied to the inverter exceeds 150% of its rated load or the operation frequency is less than 0.1Hz, the inverter may trip in a shorter time.

Inverter's overload protective characteristic

E-27