Toshiba VF-A7 Regular inspection, Check points, Inspection method, By feel touch

13.Regular inspection and maintenance

Danger

Mandatory

･Be sure to inspect the inverter regularly.

If the inverter is used without regular inspection, it may cause trouble or accident because sign of disorder or failure is missed.

･Complete the following steps before proceeding to inspection. 1 Cut off power supply (turn off the inverter).

2 10 minutes or more after power cutoff, check to see if the charge indicator lamp is turned off.

3 Make sure that voltage in the DC main circuit (between PA and PC) is 45 V or lower by use of a tester capable of measuring high DC tension (800 V DC or more).

If the above-mentioned steps are skipped before inspection, it may cause an electricshock.

To prevent the inverter from failure caused by operating environment such as influence of temperature, humidity, dust and so on, vibration, and aging of component parts, and end of estimated service life, execute daily or regular inspection without fail.

13.1 Regular inspection

Since electronic parts are easily affected by heat, install the inverter in a cool, well-ventilated, dust-free place for making it demonstrate its original performance for a long time.

Purpose of regular inspection is to find sign of failure or malfunction by comparing current data on operation with recorded data on past operation.

Subject of			Gist of inspection		Criteria of judgment
inspection	Inspection item		Inspection cycle	Inspection method
	1)	Dust,		1) Eye-check,	1) Improve bad points.
		humidity, gas		thermometer,	2) Pay heed to trace left of
1. Indoor	2)	Dropping of		sense of smell	water drop.
		water and		2) Eye-check	3) Maximum 40°C (50°C inside
environment
		other liquid		3) Thermometer	cabinet)
	3) Room
		temperature
2. Component			As occasion		If something feels abnormal, open the
				By feel (touch) of	door and check transformer, reactor,
	1)	Vibration,	demands
parts and				outside of the	contactor, relay, cooling fan, etc.
		noise
units				board	Stop the inverter as occasion
					demands.
	1)	Load current		Moving-iron type	Within the rating
3. Operation	2)	Voltage*		AC ammeter	Little difference from data on
data (output	3)	Temperature		Rectifier type AC	normal status
side)				voltmeter
				Thermometer

＊）Voltage is differently read depending on the measuring instrument used. Use the same tester or voltmeter for every inspection and record measurement result each time.

■Check points

1.Something unusual in the installation environment

2.Something unusual in the cooling system

3.Unusual vibration and noise

4.Overheat, discoloration

5.Unusual smell

6.Unusual motor vibration, noise and overheat

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