Toshiba VF-AS1 High-speed operation at and above 50Hz/60Hz rated frequency, Motor with brake

! E6581301!

High-speed operation at and above 50Hz/60Hz (rated frequency)

Operating at frequencies greater than 50Hz/60Hz will increase noise and vibration. There is also a possibility that such operation will exceed the motor's mechanical strength under these conditions and the bearing limits. You should verify with the motor's manufacturer operating.

Method of lubricating load mechanisms

Operating an oil-lubricated reduction gear and gear motor in the low-speed areas will worsen the lubricating effect. Check with the manufacturer to find out about operable speed range.

Low loads and low inertia loads

The motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of 50% or

1 under of the rated load, or when the load's moment of inertia is extremely small. If that happens reduce the carrier frequency.

Occurrence of instability

Unstable phenomena may occur under the load and motor combinations shown below.

•Combined with a motor that exceeds applicable motor ratings recommended for the inverter

•Combined with special motors

To deal with the above lower the settings of inverter carrier frequency. (When performing vector control, set the carrier frequency at 2kHz or more. If the carrier frequency is set below 2kHz, it will be automatically corrected to 2kHz by the inverter.)

• Combined with couplings between load devices and motors with high backlash

In this case, set the S-pattern acceleration/deceleration function and adjust the response time inertial moment setting during vector control or switch to V/f control (￿￿=￿).

• Combined with loads that have sharp fluctuations in rotation such as piston movements

In this case, adjust the response time inertial moment setting during vector control or switch to V/f control (￿￿=￿). If it is operated in vector control mode (For torque control mode), only a motor whose capacity is same as inverter standard or 1 size smaller should applied.

Braking a motor when power supply is lost

A motor with its power cut off goes into freewheel, and does not stop immediately. To stop the motor quickly as soon as the power is cut off install an auxiliary brake. There are different kinds of brake devices, both electrical and mechanical. Select the brake that is best for the system.

Loads that generate negative torque

When combined with loads that generate negative torque the protection for overvoltage and overcurrent on the inverter will go into operation and may cause a trip. For this kind of situation, you must install a dynamic braking resistor, etc. that complies with the load conditions.

Motor with brake

If a brake motor is used with the braking circuit connected to the output terminals of the inverter, the brake cannot be released because of a voltage drop at startup. Therefore, when using the inverter along with a brake motor, connect the braking circuit to the power supply side of the inverter, as shown in the figure below. In most cases, the use of a brake motor causes an increase in noise at low-speed.

!					(Non-exciting brake)
	MC2	(Non-exciting brake)			MC2
			B		B
MC1			IM	MC1	IM
Three-ph	FLB FLC	ST	CC	Three-	OUT1! ! ! ! P24
				phase
ase
				power
power		MC3
				supply
supply
					LOW
MC1		MC3
					LOW
					MC2
MC3		MC2
Circuit configuration 1					Circuit configuration 2

A-18