Mitsubishi X250 Spezifikationen PDF herunterladen (Seite 25)

Safety measures

A dielectric fluid temperature detector, fluid level detector,

abnormal machining detector and automatic fire extinguisher,

standard equipment, and a flame-resistant metal hose is used.

Following legal ordinances, a tank which has passed a water

leakage test is used (for tank capacities less than 2,000 ,

tanks which have passed a voluntary water leakage test). Note

that the safety devices must be periodically inspected. Refer to

the instruction manual (safety manual) when using the EDM.

When heat is detected, a light-

water solution is automatically

sprayed to extinguish the fire.

Machining also stops

automatically at this time.

A separate 100VAC power

supply is required for the

automatic fire extinguisher.

Automatic fire extinguisher

Machining is

automatically stopped

when the dielectric

fluid temperature

reaches approx. 

60℃, or when the

fluid level drops

during machining.

Dielectric fluid 

temperature and fluid 

level detector

Certificate of 

voluntary water 

leakage test 

acceptance

Preparation for Machine Installation Precautions

Selecting the power facility capacity

Selecting the power input cable size and input power voltage

No-fuse breaker and earth-leakage breaker

Preventing fires and accidents with EDMs

Cautions

• Ensure that the upper part of the workpiece is submerged by

50mm (1.97in) or more (FP60EA, FP60MA, FP80V) or

100mm (3.94in) or more (FP100EA, FP120V) from the

surface of the dielectric fluid

• Never conduct spray machining as there is a risk of fire

• Do not use equipment that produces heat or sparks such as

heating systems, welding machines, or grinding machinery

near the EDM

• Always keep the area clean and tidy, and do not store

flammable materials near the EDM

• Install an extra fire extinguisher in addition to the automatic

fire extinguisher enclosed with the EDM

• Ensure that the area is sufficiently ventilated

• Monitoring automatic operation : For safety purposes, make

sure an operator is always present during operation, even if

various safety devices are equipped, so that appropriate

actions can be taken

Nozzle

Shank

Tool electrode

Lead wire

Dielectric fluid

Electric discharge between tool

electrode and jet nozzle.

Electric discharge between lead

wire having broken insulated

coating and workpiece clamp.

Machining of a workpiece that

is too tall for the working tank.

Machining with sufficient room

in the working tank but not

enough dielectric fluid.

Electric discharge between

tool electrode and shank

because of tool electrode

and shank dislocation.

Electric discharge between tool

electrode and workpiece clamp.

Case in which electric discharge

occurs in an unexpected section

and very close to the fluid surface.

Clamp

Never attempt the following operation methods. These are extremely hazardous.

Before installing an EDM, ensure that sufficient power capacity can be supplied to meet the total power input requirements. The total

power input requirements include the power for the main unit and accessories (options).

When selecting a no-fuse breaker or earth-leakage breaker for the

primary side of the EDM, calculate the total facility capacity, and

select the breaker using the following table as a reference. The

breakers in the following table allow for the rush current of the

transformer in the power supply panel.

The following table is a guide for calculating the

appropriate power cable size to use based on total

capacity.

The cable size should be sufficient to allow some leeway.

To prevent malfunctions caused by the external noise from

control units, a filter is installed on the power supply input. By

grounding one end of this filter, an earth-leakage current of

approx. 30 to 40mA passes through this filter. If a highly

sensitive earth-leakage breaker (sensitivity current 30mA) is

installed, malfunctions could occur. Thus, a medium sensitivity

earth-leakage breaker (sensitivity current 100 to 200mA) is

recommended for the EDM. Class C grounding (grounding

resistance 10Ω or less) is recommended for the EDM. If Class

C grounding is provided, even if the sensitivity current is

200mA, the contact voltage will be 2V or less, and no

problems will occur in preventing electric shock (application of

tolerable contact current Class 2, 25V or less).

EDM power supplies use the latest electronics technologies. Any large

fluctuation in the voltage can cause an EDM to deviate from its

optimum working conditions, and cause a reduction in efficiency.

Although fluctuations within approx. ±5% of the rated voltage will not

cause a problem, an automatic voltage regulator (AVR) should be used

to stabilize fluctuations of ±10% or more that last for a long period of

time (e.g., operating the EDM at 180V when rated voltage is 200V).

Harmonic distortion in the power supply could affect machining

operation even when there is no voltage fluctuation. If such a problem

occurs, avoid use near equipment that generates harmonic distortion,

or provide measures such as a line filter.

Facility capacity

Total power input

(Machine input + power supply input + dielectric fluid temperature control unit input)

Total facility capacity

Total facility capacity Cable size

No-fuse breaker

Earth-leakage breaker

Precautions for selecting earth-leakage breakers

Stabilizing the power supply

Harmonic distortion

Control unit

Machine body

47 48

Product Line-up

Machining Samples

Total Solutions

Machine Specifications

and Options

Advance Series

Functions and Features

EA Series Functions

and Features

Advance Series

Product Introduction

MA, EA Series

Product Introduction

Advance Control Unit

Tooling

64-bit Control Unit

Power Supply/Control

Specifications

Preparation for

Machine Installation

Precautions

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