Toshiba VF-nC1 instruction manual Inspection and maintenance, Regular inspection, Check points

E6581090

14. Inspection and maintenance

Danger

•The equipment must be inspected every day.

	If the equipment is not inspected and maintained, errors and malfunctions may not be
Mandatory	discovered which could lead to accidents.

•Before inspection, perform the following steps.

①Shut off all input power to the inverter.

②Wait for at least 15 minutes and check that the charge lamp is no longer lit.

③Use a tester that can measure DC voltages (800V DC or more), and check that the voltage to the DC main circuits (across PA-PC) does not exceed 45V.

Performing an inspection without carrying out these steps first could lead to electric shock.

Be sure to inspect the inverter regularly and periodically to prevent it from breaking down because of the environment of use, such as temperature, humidity, dust and vibration, or deterioration of its components with aging.

14.1Regular inspection

Since electronic parts are susceptible to heat, install the inverter in a cool, well-ventilated and dust- free place. This is essential for increasing the service life.

The purpose of regular inspections is to maintain the correct environment of use and to find any sign of failure or malfunction by comparing current operation data with past operation records.

Subject of			Inspection procedure			Criteria for judgment
inspection		Inspection item		Inspection	Inspection method
				cycle
	1)	Dust, temperature		Occasionally	1) Visual check, check by	1) Improve the environment if
		and gas			means of a thermometer,	it is found to be
1. Indoor					smell check	unfavorable.
	2)	Drops of water or		Occasionally	2) Visual check	2) Check for any trace of
environment
		other liquid				water condensation.
	3)	Room		Occasionally	3) Check by means of a	3) Max. temperature: 40°C
		temperature			thermometer	(50°C inside the cabinet)
						If something unusual is found,
						open the door and check the
2. Units and	1)	Vibration and		Occasionally	Tactile check of the cabinet	transformer, reactors,
components		noise				contactors, relays, cooling fan,
							14
						etc., inside. If necessary, stop
						the operation.
	1)	Load current		Occasionally	Moving-iron type AC	To be within the rated
3. Operation	2)	Voltage (*)		Occasionally	ammeter	current, voltage and
data					Rectifier type AC voltmeter	temperature.
	3)	Temperature		Occasionally	Thermometer	No significant difference from
(output side)
						data collected in a normal
						state.

*) The voltage measured may slightly vary from voltmeter to voltmeter. When measuring the voltage, always take readings from the same circuit tester or voltmeter.

■Check points

1.Something unusual in the installation environment

2.Something unusual in the cooling system

3.Unusual vibration or noise

4.Overheating or discoloration

5.Unusual odor

6.Unusual motor vibration, noise or overheating

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